Rolls-Royce Engine 250–C18, 250–C18A, 250–C18B, 250–C18C. Operation and Maintenance Manual (2003) - page 4

 

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Rolls-Royce Engine 250–C18, 250–C18A, 250–C18B, 250–C18C. Operation and Maintenance Manual (2003) - page 4

 

 

Maintenance Tools (Sheet 5 of 8)
FIG. 1
Page 10
Maintenance Tools (Sheet 6 of 8)
FIG. 1
Page 11
Maintenance Tools (Sheet 7 of 8)
FIG. 1
Page 12
Insert Detail NO.
Bearing Puller Application
6796950-4
Torquemeter Support Shaft Roller Bearing Inner Race
-5
Torquemeter Shaft Support Roller Bearing Inner Race
–6
Torquemeter Piston
–7
Tachometer and Governor Power Train Spur Gearshaft (Housing end),
and Gas Producer Gear Train Idler Spur Gearshaft
-8
Gas Producer Gear Train Idler Spur Gearshaft (Cover End)
–23
Helical Power Train Drive Gear
–10
Helical Power Takeoff Gearshaft Roller Bearing Inner Race
–11
Helical Power Takeoff Gearshaft Ball Bearing
–12
Tachometer and Governor Power Train Spur Gearshaft (Cover End),
Fuel Control and Oil Pump Spur Gearshaft (Cover End), Fuel Pump
Drive Spur Gearshaft, Accessory Drive Spur Gearshaft, and Starter
Generator Spur Gearshaft
-13
Fuel Control and Oil Pump Spur Gearshaft (Housing End), Gas
Producer Gear Train Idler Spur Gearshaft (Housing End)
-14
Fuel Control and Oil Pump Spur Gearshaft (Cover End)
AD KIT 6796950
Maintenance Tools (Sheet 8 of 8)
FIG. 1
Page 13
4.
Consumable Materials
Refer to Table 1 for a summary of consumable materials used to maintain the engine. The Acceptable Source
column of the table lists only one supplier for each item; any equivalent product is acceptable. In determining
whether or not an item is equivalent, the burden of proof rests with the operator and his supplier, not with
Rolls-Royce.
TABLE 1
Consumable Materials
Material
Use
Acceptable Source
Engine oil
Lubricate bearings, O-rings, etc.
Refer to Oil Specification, Section I
Carbon removal compound
Clean aluminum-coated steel
Gunk Hydroseal Decarbonizer
parts
(MIL-C-25107).
Gunk Laboratories Inc.
630 North Harlem Ave.
Oak Park, Illinois 60302
Cresol base cleaning compound
Clean steel parts
Formula No. 3097 (MIL-C-5546).
Turco Products Inc.
Turco Products Inc. 2400 South
Main St.
Wilmington, California 90746
Corrosion compound
Inhibiting fingerprint corrosion
Non-Rust X-210
Daubert Chemical Co., Inc. 4700 S.
Central Avenue
Chicago, IL 60038
Rust preventive compound
Coat steel parts after cleaning
Anti-Corrode 204 (MIL-C-6529,
type 1). Cities Service Oil Co. P.O.
Box 300 Tulsa, Oklahoma 74102
Shipping container bolts
Royco 103
Royal Lubricants Company Inc.
Valvoline TECTYL 890
Ashland Petroleum Company P. O.
Box 391 Ashland,
Kentucky 41101
Preservation oil
Fuel system preservation
MIL-PRF-6081, Grade 1010 or
1005 NATO Symbol Code 0-132 and
0-133
Bray K-80, K-877, K-460
Bray Oil Company
1925 North Marina Ave.
Los Angeles, California 94804
McMillan Jet Engine Oil 1005 or
1010
McMillan Ring Free Oil Company,
Inc.
200 Petroleum Building
El Dorado, Arkansas 71730
No. 31100 (MIL-PRF-6081,
grade 1010)
Atlantic Richfield Co.
260 South Broad Street
Philadelphia, Pennsylvania 19101
Page 14
May 15/00
TABLE 1
Consumable Materials - continued
Material
Use
Acceptable Source
Preservation oil (cont)
Gulfite 6 (MIL-PRF-7870A)
Gulf Oil Corp.
439 7th Ave.
Philadelphia, Pennsylvania15230
Royco 460, 481
Royal Lubricants Company, Inc.
River Road
East Hanover, New Jersey 07936
Aeroshell Turbine Oil 2
Shell International Petroleum Com-
pany Ltd.
Shell Centre
London SE1 7 NA
United Kingdom
Cleaner
NOTE:
Rolls-Royce strongly recommends strict adherence to the mixture ratios outlined by each
cleaner manufacturer. The mixture ratios do vary from manufacturer to manufacturer and
can be found on each container label. Strict adherence to the application procedures
described in this manual must be followed. This will prevent compressor or engine and
control system damage.
Clean compressor air-flow path,
Brulin’s Turbine Cleaner
fuel nozzle, and burner drain
No. 1191 or 715N Safety-Solv
valve
(MIL-C-43616).
2920 Dr. Andrew J. Brown Ave. P.O.
Box 270
Indianapolis, Indiana 46206
Turco 4181
Turco Products, Inc.
Subsiderairy of Elf Atochem
7320 Bolsa Ave.
Westminster, CA 92684-3600
Brulin 815
Brulin & Co.
P.O. Box 270
Indianapolis, IN 46206-0270
Compressor wash
20-20 Plus (MIL-C-43616)
B & B Chemical Co. Inc.
P.O. Box 796
Miami, Florida 33166
B & B 3100
B & B Chemical
P.O. Box 796
Miami, Florida 33166
No. 5884
Turco Products
Division of Purex Corp.
24600 South Main Street
Carson, California 90746
Page 15
May 15/00
TABLE 1
Consumable Materials - continued
Material
Use
Acceptable Source
Cleaner (cont)
Clean compressor air-flow path,
Racasan 512-M
fuel nozzle, and burner drain
Odex Racasan, Ltd.
valve
Cromwell Road
Elesmere Port
South Wirral
L654DP, England
R-MC
ECT, Inc.
771 First Ave.
King of Prussia, PA 19422
Used as compressor cleaner
Turboclean 2
Kent Chemical Co., Ltd.
George House, Bridwell Lane
Tenterton, Kent TN306HS, England
Rochem GTE (krankwash)
Rochem, Inc.
5619 S. Wayside Drive
Houston, TX 77087
ZOK 27
Airworthy Ltd.
Wegglen Industrial Estate
Midhurst Sussex
G299RE, England
Penair M5704
Penetone Corporation
74 Hudson Avenue
Tenefly, NJ 07670
ARDROX 624
Brent Chemicals International
Ardox Division
Ridgeway, Iver, Buckinghamshire
SLO955
England
Turco 6783-10 and -50
Turco Products, Inc
7320 Bolsa Ave.
Westminster, Ca 92684-3600
B&B TC-100N-1
B&B Tritech, Inc.
Miami, Fl 33266-0766
Ardrox 6367- Turbo Clean 2
921 Sherwood Drive
Lake Bluff, IL 60044-0215
ARDROX 6345
Sure Chem Industries
23 Amax Ave. Girraween,
New South Wales, 2145
Page 16
May 15/00
TABLE 1
Consumable Materials - continued
Material
Use
Acceptable Source
Sodium hydroxide and phospher-
Cleaning Pc filter, Bendix control Commercial
ic acid
system
NOTE: Rolls-Royce has approved the cleansers for use with Rolls-Royce engines but assumes no
liability for injury to personnel or the environment by their use.
Sodium dichromate and sulphuric
Cleaning Pc filter CECO control
Commercial
acid
system
Perchlorethylene or methylene
Cleaning
Commercial
chloride
Heat resistant paint
Diffuser scroll touch-up, gear-
Actithane WC100
box paint repair and galvanic
Saran Protective Coatings, Co.
corrosion protection
17332 Shields
48212
Detroit, MI
Lacquer reducer
Diffuser scroll touch-up; used
Actithane H251
with Actithane WC100
Saran Protective Coatings Co.17332
Shields
48212
Detroit, MI
Mineral spirits
General cleaning
Commercial
Chemical film
Treat cleaned anodized
Chem-Rite A22 (MIL-C-5541).
aluminum-alloy parts
M and T Chemicals Inc.
Church St.
Matawan, New Jersey 07747
Corrosion resistant
Compressor case, scroll, and
SermeTel 196.
aluminum paint
gas producer and power turbine
Teleflex Inc.
supports touch-up
P.O. Box 218
North Wales, Pennsylvania 19454
Lubricant
Lubricate accessory splines
Lubriplate 130A or 930AA.
Fiske Brothers Refining Co.
129 Lockwood
Newark, New Jersey 07105
ASTM No. 5
Sun Oil Co.
1608 Walnut Street
Philadelphia, Pennsylvania 19103
Lubricate air seal packings
MIL-O-6081
grade 1010 oil
Atlantic Refining Co.
260 South Broad Street
Philadelphia, Pennsylvania 19101
Page 17
May 15/00
TABLE 1
Consumable Materials - continued
Material
Use
Acceptable Source
Grease
Seal and bearing installation and
No. 6249 (MIL-G-23827).
assembly aid
Shell Oil Co.
Shell Building
Houston, Texas 77002
ROYCO HF-825
Royal Lubricants Co., Inc.
280 Complex,
101 Eisenhower Parkway
Roseland, New Jersey 07068
Starter generator gearshaft dry
Aeroshell No. 22 (MIL-G-81322)
splines, fuel control splines, and
Shell Oil Co., Shell Building
power turbine governor splines
Houston, Texas 77002
Mobil No. 28 (MIL-G-81322)
Mobil Oil Corp., P.O. Box 3311
Beaumont, Texas 77704
Fuel pump fuel control and
Sundstrand P/N 718050
governor drive splines. Sun-
(recommended)
strand/Pesco fuel pump internal
Sundstrand Corp.
splines only (external splines re-
4751 Harrison Ave.
quire engine oil).
Rockford, Illinois 61108
Fuel pump (Argo Tech/TRW
Plastitube No. 3
only) and fuel control drive
Warren Refining Division
shafts
Parr Inc.
5151 Denison Ave.
Cleveland, Ohio 44102
Lubricate packings in fuel con-
ASTM No. 5 Oil
trol fuel or air passages
Sun Oil Company
1608 Walnut Street
Philadelphia, Pennsylvania 19103
Alternates to ASTM No. 5 Oil:
1.
45-55% fuel (MIL-C-7024B,
Type II) mixed with 45-55%
STP Oil Treatment
2. MIL-D-6081, Grade 1010 oil
Page 18
May 15/00
TABLE 1
Consumable Materials - continued
Material
Use
Acceptable Source
Antiseize compound
Pc filter threads and external
DC 550 Fluid
threads-and external threads-
Dow Corning Corp.
protects up to 450°F (232°C)
South Saginaw Road,
Michigan 48641
Hot section external threads (not
Never Seez Nickel Special (NSN165)
to be used where exposed to
Bostik, Emhart Chemical Group
the engine oil system)
Boston Street
Middleton, MA 01949
Bostik, Emhart Chemical Group
2350 Devon Street, Dept. TR
Des Plaines, IL 60018
Telex: 72-8300
1-800-343-8178
External threads not exposed to
CP-63 (MIL-L-25681B)
oil system. Protects to 1400°F
E/M Lubricants Inc.
(760°C)
P.O. Box 2200
Highway 52, N.W.
West Lafayette, Indiana 47906
External threads
DC 550 Fluid
Protects up to 450°F (232°C)
Dow Corning Corp.
South Saginaw Road
Midland, Michigan 48641
Spark igniter threads
Surf-Kote H205
Hohman Plating & Mfg., Inc.
Dayton, Ohio 45404
Assembly
Molykote Type Z
Dow Corning Corp.
South Saginaw Road
Midland, Michigan 48641
Molykote Microsize Powder
Dow Corning Corp.
Alpha-Molykote Plant
64 Harvard Ave.
Stamford, Connecticut 06902
Molykote 321R
Dow Corning Corp.
South Saginaw Road
Midland, Michigan 48641
Page 19
May 15/00
TABLE 1
Consumable Materials - continued
Material
Use
Acceptable Source
Calibration fluid
Cleaning fuel nozzle tips
Stoddard solvent, refined kerosene
(MIL-F-7024, type II) 300-400°F
boiling range.
Carbon solvent
Cleaning double check valve
No. 26.
Cities Service Oil Co.
P.O. Box 300
Tulsa, Oklahoma 74102
Ardrox No. 624
Ardrox Australia Pty. Ltd.
Lidscombe, N.S.W., Australia
Cleaning fuel nozzle
Penetone Corp.
Penetone ECS
74 Hudson Avenue
Tenafly, NJ 07670
NOTE: Rolls-Royce has approved the cleansers for use with Rolls-Royce engines but assumes no
liability for injury to personnel or the environment by their use.
Weld rod
1st-stage turbine nozzle
X-40 (EMS 70175) or alternate
Haynes 188 (AMS 5801)
Combustion liner and exhaust
AISI 349, (29-9 W Mo).
collector support
(MIL-R-5031 class 6),
(AMS 5784)
Exhaust collector support, struts Hastelloy W (AMS 5786)
(MIL-R-5031 class 12),
Engine gray enamel
Gearbox touch-up
Saran Protective Coatings Co.
Actithane WC100 paint
17332 Shields
Detroit, MI
48212
Lacquer Reducer
Use with Actithane
Actithane H251
WC100 paint
Saran Protective Coatings Co.
17332 Shields
Detroit, MI
48212
Page 20
May 15/00
TABLE 1
Consumable Materials - continued
Material
Use
Acceptable Source
Petrolatum
Metallic seal and bearing instal-
Vaseline
lation
Moisture proof barrier material
Engine packaging
Flexkin 100P (MIL-B-131).
Acme Backing Corp.
P.O. Box 360
Stamford, Connecticut 06904
Marking pencils
Marking hot section parts
See Table 2.
Dehydrating agent 16-unit bags
Storage and shipment
CS-16 (MIL-D-3464).
Filtrol Corp.
3250 East Washington
Los Angeles, California 90023
Pressure sensitive masking
Storage and shipment
No. 260 Scotch Brand.
tape-1- or 2-in. width
Minnesota Mining and Mfg. Co.
3M Center
St. Paul, Minnesota 55101
Black stencil ink
Storage and shipment
K-1 (TT-I-559).
March Stencil Machine Co.
707 East B St.
Belleville, Illinois 62222
Moisture absorbing rust preventa-
Compressor preservation and
No. 606
tive
external engine surfaces
Rust-Lick Incorporated
755 Boylston Street
Boston, Massachusetts 02116
Rocket WD40 (MIL-C-23411).
WD-40 Co.
San Diego, California
WD-40
Dr. Oskar Trost
Industrie und
Auto Chemie
2350 Neumuenster
West Germany
or
Betriebs & Werkstatt -
Zubehoer Gmbh
Riedstrasse 25
7302 Ostfildern 1-Ruit
West Germany
Page 21
May 15/00
TABLE 1
Consumable Materials - continued
Material
Use
Acceptable Source
Moisture absorbing rust preventa-
WD-40
tive (cont)
Hawker Pacific, Pty. Ltd.
4-8 Harley Cresent
Condell Park
New South Wales 2200
Australia
Compressor preservation and
Pengard
External engine surfaces (cont)
Penetone Co. Ltd.
Bassington Industrial Estate
Cramlington, Northumberland
United Kingdom
Ardrox 3961
Ardrox Limited
Commerce Road
Brentford, Middlesex, England
Androx Australia Pty. Ltd.
Birnie Avenue
Lidscombe N.S.W., 2141 Australia
CRC 3-36
CRC Chemicals Division
C.J. Webb Inc.
Limekiln Pike
Dresher, Pennsylvania 19025
Methylethylketone Sealant
General cleaning
Commercial
Assembly-oil bellows seal
No. 1372 W.
Permatex Co. Inc., Box 1350
Flanger Court Building
West Palm Beach, FL 33402
Page 22
May 15/00
TABLE 1
Consumable Materials - continued
Material
Use
Acceptable Source
High temperature lubricant
Where antiseize is specified in
Never-Seez Nickel Special.
this manual
Bostik, Enhart Chemical Group
Boston Street
Middleton, MA 01949
Bearing Supply and Service
448-472 Notre Dame Ave.
Winnipeg 2, Canada
R. A. Rodriguez (U.K.) Ltd.
Station House-Darkes Lane
Potters Bar
Herts, England
Consolidated Brg, Co. Pty. Ltd.
238 Victoria Rd.
Drummoyne, N.S.W.
Australia
Kyokuto Boeki Kaisha Ltd.
7th Floor, New Otemachi Bldg.
2-1, 2-Chome, Otemachi
Chiyoda-Ku, Tokyo, 100-91
Japan
S. A. Brasileira De Rolamentos
E. Mancais BRM
Av. Senador Queiroa, 605
Conj. 1609
Sao Paulo, Brazil
Tekind
Via F. Melzi D’Eril, 3
20154 Milano, Italy
DSL Super Hi-Temp
Davis-Howland Oil Corporation
200 Anderson Avenue
Rochester, New York 14607
Sealer
Compressor mounting insert
Devcon F (aluminum).
installation
Devcon Corp.
Danvers, Massachusetts 01923
Resiweld FE186
H. B. Fuller Company
2400 Kasota Ave.
St. Paul, Minnesota 55102
Metal Set A-4.
Smooth-on Inc.
1000 Valley Road
Gillette, New Jersey 07933
Page 23
May 15/00
TABLE 1
Consumable Materials - continued
Material
Use
Acceptable Source
Sealer (cont)
Epon 934
Hysol Div. Dexter Corp.
2850 Willow Pass Road
Pittsburgh, California 94565
Compressor case splitline
RTV 732 or RTV 736
Dow Corning Corp.
South Saginaw Road
Midland, Michigan 48640
RTV 106
General Electric Corp.
Waterford, New York 12188
Assembly-gearbox splitline
Scot Clad 776
Scotch Clad Coatings
Minnesota Mining and Mfg. Co.
3-M Centre
St. Paul, Minnesota 55101
DC 994
Dow Corning Corp.
South Saginaw Corp.
Midland, Michigan 48641
Permatex No. 1372
Permatex Co. Inc.
Box 1350
Flanger Court Bldg.
West Palm Beach, FL 33402
Installation of labyrinth station-
Loctite 620 or 602
ary seal bearing area
Loctite Corp.
705 North Mountain Road
Newington, CT 06111
Sealant removal
Removal of Loctite 620 or 602
Loctite “chisel” solvent Loctite Corp.
705 North Mountain Road
Newington, CT 06111
Silicone resin sealer clear (AMS
Repair of compressor case plas-
1-2531
3135)
tic cracks
Dow Corning Corp.
South Saginaw Road
Midland, Michigan 48640
METROSEAL AP
METCO Inc.
405 Prospect Ave.
Westbury, Long Island,
New York 11590
Page 24
May 15/00
TABLE 1
Consumable Materials - continued
Material
Use
Acceptable Source
Methyl alcohol (Fed Spec O-M
Cold weather compressor water
Commercial Solvents Corp.,
232d, grade A; Rolls-Royce
rinse
245 Park Ave.
EMS-125) (British Standard BS
New York, N.Y. 10017
506 Amend. 1)
Union Carbide Corp.
Chemicals and Plastics,
270 Park Ave.
New York, N.Y. 10017
Desiccant
Shipping package humidity con-
No. 88 Absorbent Protective
trol
Dehydrating Agent (MIL-D-3464)
Delta Packaging Products
4108 North Nashville Avenue
Chicago, Illinois 60634
Liquid leak detector
Checking for pneumatic leaks
SNOOP (meets Mil Spec
MIL-L-25567C, type 1 oxygen
systems)
Indiana Valve & Fitting Inc.
P.O. Box 24267
Indianapolis, Ind 46224
Liquid leak detector (cont)
Leak-Tec Formula 372E
American Gas and Chemical Co.
5 Tefnakil Park
Cresskill, New Jersey 07626
Adhesive retention
Oil pump gearshaft
Loctite 290
Loctite Corporation
705 North Mountain Road
Newington, Connecticut 06111
Fuel anti-ice additive
Fuel anti-ice
Prist (MIL-I-27686E)
PPG Industries Inc.
5629 FM 1960 West
Houston, Texas 77069
Torque Paint
Application of slippage marks to
Torque Seal F-900
pneumatic and lubrication
Organic Products Company
system “B” nuts
P.O. Box 428
Irving, Texas 75060-0428
Torque Paint Remover
Removal of torque paint (slip-
F-100 Remover
page marks)
Organic Products Company
P.O. Box 428
Irving, TX
75060-0428
Assembly fluid
Assembly aid
Ultra Chem No. 1
Ultra Chem Inc.
1400 N. Walnut Street
Wilmington, Deleware 19899
Page 25
May 15/00
5.
Acceptable Marking Pens and Pencils
CAUTION: THESE PENCILS, MARKERS AND PAINT STIKS ARE ALSO APPROVED FOR MARKING
TITANIUM ALLOYS PROVIDING THE MARKINGS ARE REMOVED PRIOR TO EXPOSURE OF
THE PARTS TO TEMPERATURES ABOVE 500°F (260°C) BY HEAT TREATMENT OR ENGINE
OPERATION. THE NUMBER IN THE PARENTHESES THAT FOLLOWS THE MANUFACTURER’S
NAME CORRESPONDS TO THE ADDRESS LISTING AT THE END OF THIS TABLE.
NOTE: The following pencils, fine tip and wide markers, ball point markers, and paint stiks are approved for
marking iron, nickel and cobalt base alloys which are exposed to temperatures above 800°F (427°C)
either by heat treatment or engine operation. Markings on these alloys do not have to be removed
from the parts prior to heating above 800°F (427°C).
TABLE 2
Acceptable Marking Pens and Pencils
Manufacturer Number
Trade Name
Number
Color
Pencils
Venus (1)
Unique
1237
Carmine
Red
Berol Corp. (2)
Eagle Verithin
745
Carmine
Red
A. W. Faber (3)
The Winner
2383
Dark
Green
Berol Corp.(2)
Eagle Verithin
751
True
Green
A.W. Faber (3)
The Winner
2388
White
Venus (1)
Unique
1215
White
Berol Corp.(2)
Eagle Verithin
734
White
Venus (1)
Unique
1206
Blue
Koh-I-Noor(4)
Flexicolor
X1800X25
Blue
Berol Corp.(2)
Eagle Verithin
758
True Blue
Berol Corp.(2)
Eagle Verithin
737
Orange
A.W. Faber (3)
The Winner
2462
Silver
Berol Corp.(2)
Eagle Verithin
753
Silver
Eberhard Faber (5)
Colorbrite
2101
Silver
Fine Tip Markers
Carters (6)
Marks-A-Lot
--
Yellow
Berol Corp. (2)
Flash 30
--
Red
–-
Lindy
--
Green
Berol Corp.(2)
Flash 30
--
Blue
–-
Lindy
--
Blue
Berol Corp. (2)
Flash 32
--
Blue
Sanford Corp. (12)
T.E.C.
3201
Black
Wide Tip Markers
Berol Corp. (2)
Eagle Marker
8835
Black
Berol Corp. (2)
Liquid Tip
1100
Black
Page 26
May 15/00
TABLE 2
Acceptable Marking Pens and Pencils - continued
Manufacturer Number
Trade Name
Number
Color
Wide Tip Markers
Berol Corp. (2)
Liquid Tip
1100
Red
Berol Corp. (2)
Eagle Marker
8824
Red
Berol Corp (2)
Eagle Marker
8802
Blue
Berol Corp. (2)
Eagle Marker
8816
Yellow
Sanford Corp. (12)
T.E.C. Marker
1501
Black
Ball Point Markers
Markall (7)
--
--
Blue
Markall (7)
--
--
Yellow
Paint Stiks
Markal Company (7)
Paintstik Type B
--
Yellow
Markal Company (7)
Paintstik Type B
--
White
Markal Company (7)
Paintstik Type B
--
Green
Markal Company (7)
Paintstik Type B
--
Brown
Markal Company (7)
Paintstik Type B
--
Orange
Markal Company (7)
Paintstik Type B
--
Purple
American ArtClay Co. (8)
Glass Cellophane
2346
Blue
CAUTION: DRI-MARQUETTE BLACK INK MAY BE USED ON TITANIUM ALLOYS BUT MUST BE REMOVED
PRIOR TO EXPOSURE TO TEMPERATURES ABOVE 500°F (260°C).
NOTE: Dri-Marquette Black Ink, a product of the Irwin-Hodson Co., (9) is approved for marking on iron,
nickel and cobalt base alloy parts. The markings do not have to be removed prior to exposure to
temperature above 800°F (427°C).
NOTE: LNC-3 Nuclear Grade Electrolyte, a product of the Lectroetch Company, (10) is approved for
electrolytic etching on iron, nickel, cobalt, titanium, aluminum and magnesium alloys. This process is
for permanent marking of identification on parts.
NOTE: Pyromarker, a product of Ball Point Metal Marker, Tempil Division, Big Three Industries, Inc,(11) is
approved for marking on iron, nickel and cobalt base alloys and on titanium alloys. Markings on
these alloys do not have to be removed prior to exposure to temperature above 500°F (260°C).
Manufacturer Addresses
(1)
Venus-Esterbrook Corp.; Lewisburg, Tenn. 37091
(2)
Berol Corp.; P.O. Box 1000, Danbury, Conn. 06810
(3)
Faber-Castell Corp.; P.O. Box 1708, 41 Dickerson St. Newark, NewJersey 07l03
(4)
KOH-I-NOOR Rapidograph Inc.; 100 North Street, Bloomsbury, New Jersey 08804
(5)
Eberhard Faber Inc.; Crestwood Industrial Park, Wilkes-Barre, Pennsylvania. 18703
(6)
Carters Ink Co.; 275-T Wyman St., Waltham, Mass. 02154
(7)
Markall Co.; 270 North Washtenaw Ave., Chicago, Ill 60612
Page 27
May 15/00
TABLE 2
Acceptable Marking Pens and Pencils - continued
Manufacturer Addresses - continued
(8)
American ArtClay Co. Inc.; 4717 West 16th St., Indianapolis, Ind. 46224
(9)
Irwin-Hodson Co.; Ninth and S.E. Woodward, Portland, Oregon 97202
(10) The Lectroetch Co.; 14925 Elderwood Ave., Cleveland, Ohio 44112
(11) Tempil Division Big Three Industries Inc.; 2901 Hamilton Blvd, South Plainfield, N.J. 07080
(12) Sanford Corp., Bellwood, Ill, 60104
6.
Lockwire, Cotter Pins, Ring Seals, Lip Seal, Composition Gaskets, Split or Tab Washers, Self-locking
Nuts
Use 0.020 in. (0.51 mm), or .032 (.81 mm) diameter stainless steel lockwire, MS20995-C20 where
lockwire size is not specified. Double strand lockwire all drilled bolts, plugs, and screws, except those
locked with self-locking nuts or lockwashers. Lockwire bolts in pairs where possible. When
reassembling, be sure to safety wherever lockwire was removed. Do not use zinc lockwire. Do not
reuse lockwire, cotter pins, ring seals, lip seals, composition gaskets, and split or tab washers.
Self-locking nuts can be reused if they have a minimum prevailing torque within the limits given in
Table 3.
NOTE: Do not lockwire engine electrical and magnetic connectors that are of the self-locking,
quick-disconnect type.
7.
Torques
A. The following paragraphs contain general torque limits for tightening nuts, bolts, and screws.
(Refer to Table 4). Torque limits for special applications are provided under maintenance for the
specific component. Reuse self-locking nuts having a minimum prevailing torque within the limits
given in Table 3. When the tightening procedure calls for locknut drag to be added to a given
torque value, obtain the drag as follows:
(1)
Tighten the nut snug.
(2)
Back off one half turn.
(3)
Locknut drag is the torque required to first turn the loosened nut.
TABLE 3
Minimum Prevailing Torque for Used Locknuts
Fine Thread Series
Coarse Thread Series
Min Torque
Min Torque
Nut Size
(lb in.)
(N.m)
Nut Size
(lb in.)
(N.m)
8-36
0.7
0.08
8-32
0.7
0.70. 08
10-32
1
0.11
10-24
1
1 0.11
1/4-28
2
0.23
1/4-20
2
2 0.23
5/16-24
3
0.34
5/16-18
3
0.34
3/8-24
5
0.56
3/8-16
5
0.56
7/16-20
8
0.90
7/16-14
8
0.90
1/2-20
10
1.13
1/2-13
10
1.13
9/16-18
13
1.47
9/16-12
14
1.58
5/8-18
18
2.03
5/8-11
20
2.26
3/4-16
27
3.05
3/4-10
27
3.05
7/8-14
40
4.52
7/8-9
40
4.52
Page 28
May 15/00
TABLE 3
Minimum Prevailing Torque for Used Locknuts - continued
Fine Thread Series
Coarse Thread Series
Min Torque
Min Torque
Nut Size
(lb in.)
(N.m)
Nut Size
(lb in.)
(N.m)
1-12
55
6.21
1-8
51
5.76
1-1/8-12
73
8.25
1-1 /8-8
68
7.68
1-1/4-12
94
10.62
1-1 /4-8
88
9.94
TABLE 4
General Torque Limits for Bolts, Nuts, and Screws
Thread Size
Type
Torque
8-32
Screws, bolts and nuts
12-15 lb in.
(1.4-1.7 N.m)
8-36
Screws
17-20 lb in.
(1.9-2.3 N.m)
10-24
Screws
12-22 lb in.
(1.4-2.5 N.m)
10-24
Bolts and nuts
25-30 lb in.
(2.8-3.4 N.m)
10-32
Screws
22-26 lb in.
(2.5-2.9 N.m)
10-32
Bolts and nuts
35-40 lb in.
(3.9-4.5 N.m)
1/4-20
Bolts and nuts
60-65 lb in.
(6.8-7.3 N.m)
1/4-28
Flat, round, and fillister-head screws
55-58 lb in.
(5.6-6.6 N.m)
1/4-28
Bolts, nuts, and socket-head screws
70-85 lb in.
(7.9-9.6 N.m)
5/16-24
Bolts and nuts
120-150 lb in.
(14-17 N.m)
5/16-24
Self-locking nuts
140-170 lb in.
(16-19 N.m)
3/8-16
Bolts and nuts
205-245 lb in.
(23-28 N.m)
3/8-24
Bolts and nuts
240-280 lb in.
(27-32 N.m)
3/8-24
Self-locking nuts
265-300 lb in.
(30-34 N.m)
5/8-18
Bolts and nuts
90-100 lb ft.
(122-136 N.m)
Palnuts
60° or one flat past finger tight
B.
Tighten without the use of a thread lubricant unless one is specified. Threads must be free of burrs
or nicks, and they must turn freely. Complete tightening at the first draw-down causes
overstressing of parts and distorted splitlines. On bolt circles, alternately tighten nuts, bolts, or
screws that are 180° apart to half of minimum torque. Repeat the process, tightening to specified
torque. On splitlines other than bolt circles tighten midsection nuts, bolts, or screws first to half
minimum torque; then tighten remaining threaded parts to half minimum torque. Repeat the
process, tightening to specified torque.
C.
When screws are installed with nuts, the torque for the screw shall apply. (Refer to Table 4.) On
nuts with a thread size larger than one inch, tighten nuts to maximum specified torque to seat parts.
Loosen and retighten as specified.
Page 29
May 15/00
TABLE 4.1
Torque Limits for Steel Couplings on Steel Fittings
Dash
Tubing OD
Wrench
Torque
No.
Inches
Size
lb in.
N.m
–2
1/8
3/8
35-40
3.95-4.52
–3
3/16
7/16
65-100
7.34-11.30
–4
1/4
9/16
80-120
9.04-13.56
–5
5/16
5/8
150-200
16.95-22.60
–6
3/8
11/16
200-250
22.60-28.25
–8
1/2
7/8
325-400
36.72-45.19
–10
5/8
1
475-575
53.66-64.96
–12
3/4
1 1/4
660-780
74.57-88.12
–16
1
1 1/2
720-960
81.35-108.46
–20
1-1/4
2
1200-1500
135.58-169.47
D. When tightening or loosening coupling nuts, make sure the nipple does not turn on the seat of the
mating fitting. Apply torque paint across the fitting threads after tightening them. Bottoming torque
on bushing type parts that seat metal over a seal is the same as for fittings with like thread size.
For correct torque limits, see Table 4.1.
8.
Universal Fittings
(Ref. FIG. 2.)
A.
Use this procedure to install universal fittings with back-up rings.
(1) Install the nut on the fitting and run it back until the counterbore of the nut aligns with the upper
inner corner of the gasket groove.
(2) Lubricate the seal and install it on the fitting.
(3) Work the back-up ring into the counterbore of the nut.
(4) Turn the nut down until the seal is pushed firmly against the lower threaded section of the
fitting.
(5) Install the fitting into the boss, making certain the nut turns with the fitting, until the seal
touches the boss. Then tighten the fitting one and one-half turns more.
(6) Position a wrench on the nut to prevent its turning, and position the fitting by turning it not
more than one turn.
(7) Hold the fitting in its position and tighten the nut against the boss.
B.
Use this procedure to install universal fittings without back-up rings.
(1) Run the nut on the fitting end back until the washer face is aligned with the upper inner corner
of the gasket groove.
(2) Lubricate the seal and place it in the groove.
(3) Screw the fitting into the boss until the seal barely touches the boss.
(4) Turn the fitting and nut together until the nut touches the boss.
(5) Put a wrench on the nut to prevent its turning, and position the fitting by turning it in up to 270°
or unscrewing it up to 90°.
(6) Hold the fitting in its proper position and tighten the nut against the boss.
Page 30
May 15/00
Universal Fittings
FIG. 2
Page 31
May 15/00
9.
Locknut Installation
Install locknuts (klincher or equivalent) with the locking shoulder on the lead side. Tightening presses
the nut against the bolted surface to create the stress required for locking. Nuts installed upside down
will not achieve this desired locking feature.
(Ref. FIG. 3.)
10. Airframe/Engine Interface Connection
When airframe provided fittings are installed into the engine, refer to Table 5 for the recommended
torque values.
TABLE 5
Recommended Torque for Airframe/Engine Interface Connections
Torque
Thread Size
lb in.
N.m
0.375-24
25-40
2.8-4.5
0.4375-20
40-65
4.5-7.3
0.500-20
60-80
6.8-9.0
0.750-16
150-200
17-23
0.875-14
200-350
23-40
1.0625-12
300-500
34-56
Typical Locknut Installation
FIG. 3
Page 32
May 15/00
11.
Rigid Tube Installation
When a component to which rigid tube assemblies are attached is replaced, remove all interfering tube
assemblies to permit easy removal and reinstallation of the component. This precaution will prevent
subsequent damage to the tube assemblies. Tube-to-fitting alignment should be checked for proper fit,
as described in Flared Tubes and Flanged Tubes, para 11 and 12, any time such a component is
installed.
12.
Flared Tubes
WARNING: PROPER TIGHTENING OF ENGINE TUBING CONNECTIONS IS CRITICAL TO
FLIGHT SAFETY. CORRECT TORQUE VALUES MUST BE USED AT ALL TIMES.
EXCESSIVE TORQUE ON PNEUMATIC SENSING SYSTEM CONNECTIONS
RESULTS IN CRACKING OF THE FLARE OR ADJACENT TUBE AREA IN CONTACT
WITH THE FERRULE. THIS PRODUCES AN AIR LEAK WHICH CAN CAUSE
FLAMEOUT, POWER LOSS, OR OVERSPEED.
CAUTION: THE PRACTICE OF TIGHTENING FITTING LOCK NUTS WITH TUBE ASSEMBLIES
INSTALLED CAN RESULT IN DAMAGE TO THE TUBE WITH POSSIBLE FAILURE OF
THE TUBE ASSEMBLY.
A. Tube assemblies must fit and be aligned with the mating flare tube fittings to the degree that at both
ends of the assembly the flares shall uniformly seat in a free state on the cones of the mating
fittings. The fit shall be without distortion or stretching of the tube assembly and to the degree that
the nuts can be fully engaged up to the final one-half turn with light finger pressure.
(1) In the event a tube does not align with the mating fittings, reposition the mating fittings to the
degree that proper alignment may be attained. Final tightening of these fittings must be
accomplished before the tube assembly is connected.
CAUTION: EXTREME CAUTION MUST BE OBSERVED WHILE HAND BENDING
PREVIOUSLY FORMED TUBES TO PREVENT EXCESSIVE FLATTENING OF
TUBES AT THE BEND RADIUS.
(2) If proper alignment cannot be attained by repositioning mating flare tube fittings, bend the tube
sufficiently to provide alignment in the free state as specified. Accomplish all bending with the
tube removed from the engine. Adjustment of the fit may be accomplished by bending by
hand at principal bends. In the event the tube cannot be bent by hand, the tube must be
clamped in a fixture or device which will not scratch, indent, crimp, or mark the surface of the
tube during the bending operation. The flattened effect of the cross section of the tube as a
result of the reforming operation must not exceed 15 percent of the tube OD.
Page 33
WARNING: PROPER TIGHTENING OF ENGINE TUBING CONNECTIONS IS CRITICAL TO
FLIGHT SAFETY. CORRECT TORQUE VALUES MUST BE USED AT ALL TIMES.
EXCESSIVE TORQUE ON PNEUMATIC SENSING SYSTEM CONNECTIONS
RESULTS IN CRACKING OF THE FLARE OR ADJACENT TUBE AREA IN
CONTACT WITH THE FERRULE. THIS PRODUCES AN AIR LEAK WHICH CAN
CAUSE FLAMEOUT, POWER LOSS, OR OVERSPEED.
CAUTION: MAKE SURE NO LOOSE PARTICLES OF TORQUE PAINT ARE ALLOWED TO
ENTER THE CONTROL SYSTEM TUBES OR FITTINGS.
WARNING: TUBING B-NUTS USED IN INSTALLATIONS EXPOSED TO A HIGH DEGREE OF
VIBRATION AND PRESSURE SURGES ARE SUBJECT TO TORQUE
RELAXATION WHEN IMPROPERLY TIGHTENED.
WARNING: USE ACCEPTABLE TECHNIQUES AND PRACTICES TO PREVENT TORQUE
PAINT OR TORQUE PAINT REMOVER FROM CONTACTING RUBBER OR
PLASTIC MATERIALS OR ENTERING EXPOSED AREAS.
(3) When proper free state alignment is attained, complete the tubing installation by
simultaneously securing the coupling nuts. After all B-nuts are properly tightened to the
correct torque values remove old torque paint marks to prevent confusion and excessive build
up of paint. Apply a new slippage mark (torque paint) of contrasting color approximately 0.063
inch (1.60 mm) wide minimum. The mark shall extend down the side of the B-nut and onto
the mating fitting. Install necessary clamping. (Refer to 250-C18 Illustrated Parts Catalog,
Pub. No. 5W4, for clamping requirements.) Make sure that the correct clamps are installed in
the correct positions on all tubing.
(4) B-nuts shall be inspected for indications of slippage at 100 hour maintenance intervals.
(5) Old slippage marks (torque paint) shall be completely removed, using torque paint remover,
and reapplied each time the B-nut is tightened.
13.
Flanged Tubes
WARNING: PROPER TIGHTENING OF ENGINE TUBING CONNECTIONS IS CRITICAL TO
FLIGHT SAFETY. CORRECT TORQUE VALVES MUST BE USED AT ALL TIMES.
EXCESSIVE TORQUE ON PNEUMATIC SENSING SYSTEM CONNECTIONS
RESULTS IN CRACKING OF THE FLARE OR ADJACENT TUBE AREA IN CONTACT
WITH THE FERRULE. THIS PRODUCES AN AIR LEAK WHICH CAN CAUSE
FLAMEOUT, POWER LOSS, OR OVERSPEED.
A.
The alignment of tube fittings with mating sealing surfaces and the securing of tube clips must
conform to the following:
(1) Nut and Nipple Joints. With one end hand tightened, it must be possible to locate the nipple at
the free end in its conical seating, by flexing the tube by hand, without effecting a permanent
set to the assembly. The alignment of the joint must be such that the nut readily engages with
its mating thread.
(2) Setscrew Retained Flanged Adapters. The clearance and parallelism between flange and
mating surface, with the opposite end secured, must be such that the total flange area contact
can be achieved by flexing the tube by hand, without effecting a permanent set to the
assembly. Flange clearance holes must line up with tappings such that bolts can be fitted
without subjecting the tube to a torsional load.
(3) Clipping Points. Locate clips to securing points such that the setscrews can be fitted by flexing
the tube by hand, without effecting a permanent set to the assembly. Tubes which fail to meet
this requirement may be removed from the engine and reformed as follows:
(a) Tubes must be clamped in a fixture which will not scratch, indent, crimp or mark the
surface of the tube during the bending operation.
(b) Retention of the tube during bending should be made in a manner which does not permit
bending or torsional loads across welded or brazed areas.
Page 34
(c) Tubes which can be corrected for fit only by submitting welded areas to bending or
torsional loads, must be reinspected by X-ray or Zyglo for any evidence of weld or braze
fracture prior to reinstallation on the engine.
(d) Reformed tubes must meet the requirements of para A (1) and (2).
(4) When removal of the tube from the engine would result in excessive lost time due to the need
for teardown and rebuild, the tube may be reformed attached to the engine if the following
precautions are followed:
(a) Bending and torsional loads must not be applied across welded or brazed areas.
(b) The tube attachment points are to be loosened after bending (attachment points which
are inaccessible due to the state of assembly are excluded).
(c) Reformed tubes must meet the requirements of A (1) and (2).
14. Cleaning - General
WARNING: ROLLS-ROYCE HAS APPROVED THE FOLLOWING CLEANERS FOR USE WITH
ROLLS-ROYCE ENGINES BUT ASSUMES NO LIABILITY FOR INJURY TO PERSONNEL
OR THE ENVIRONMENT BY THEIR USE.
CAUTION: ENGINE THERMOCOUPLES SHOULD NEVER BE IMMERSED OR SPRAYED WITH
CLEANING SOLVENTS. LIQUID CLEANING SOLVENTS WILL PENETRATE THE POROUS
MAGNESIUM OXIDE INSULATION. ENGINE HEAT WILL VAPORIZE THE SOLVENTS
LEAVING A RESIDUE CONTAINING CARBON WHICH CAUSES A LOW RESISTANCE TO
GROUND
NOTE: Use care in separating metals for cleaning. Cleaners for steel will damage nonferrous parts.
WARNING: MINERAL SPIRITS IS TOXIC. PROVIDE ADEQUATE VENTILATION FOR
PERSONNEL USING IT.
A. Mineral spirits is the cleaning solvent recommended for nonferrous parts. Do not use rust
preventives on magnesium and aluminum parts.
B. Clean aluminum-coated steel parts with carbon removal compound (Gunk Chicago Co., Gunk
Hydroseal Decarbonizer, or equivalent). Rinse the parts with water and dry with an air blast.
C. Clean steel parts with cresol base cleaning compound (Turco Products Inc., Formula 3097, or
equivalent). Rinse the parts thoroughly with hot water. Coat parts with a compound made of one
part of rust preventive (Cities Service Anti-Corrode 204, or equivalent) and three parts oil (Atlantic
Refining Co. 31100, or equivalent).
NOTE: Do not allow bearings to spin during drying after the cleaning operation. Lubricate the
cleaned bearings lightly with engine oil and wrap to keep clean while waiting for engine
assembly.
15.
Compressor Cleaning and Preservation
A. The cleaning and preservation practices which are necessary for proper maintenance of the
compressor are as follows:
(1) Water rinse. Accomplish on a daily basis in salt water areas using the best water available.
Useable water can be obtained from the discharge of an air conditioner or from a cistern. It is
not necessary to disconnect any tubing during the water rinse; however, the bleed valve must
be blocked in the closed position. (Refer to Compressor Salt Water Contamination Removal.)
(2) Cleaning. Accomplish when the compressor becomes dirty using aircraft skin cleaner.
Cleaning is normally required after 200-300 hr of operation in smoggy areas. Tubing must be
removed and the bleed valve must be blocked closed during the cleaning. (Refer to
Compressor Cleaning.)
(3) Preservation. Accomplish when the engine will be idle for extended periods of time using
moisture absorbing rust preventive. (Refer to Compressor Preservation.)
Page 35
May 15/00
CAUTION: NEVER PERFORM THE CLEANING PROCEDURE WHILE THE ENGINE IS
OPERATING: THE COMPRESSOR BLANDES AND VANES WILL BE DAMAGED. A
MOTORED CLEANING PROCEDURE UTILIZING THE STARTER WITH N1 SPEED
BELOW 10% IS THE ONLY AUTHORIZED PROCEDURE FOR THE MODEL 250-C18
SERIES ENGINE.
CAUTION: ONCE THE COMPRESSOR BLADE CLEANING PROCEDURE HAS BEEN STARTED
IT MUST BE CARRIED THROUGH TO COMPLETION WITHOUT DELAY.
CAUTION: ENSURE THAT ROLLS-ROYCE COMMERCIAL ENGINE BULLETIN 250-C18
CEB-142 (RELOCATION OF THE PC FILTER) HAS BEEN ACCOMPLISHED.
MANDATORY COMPLIANCE DATE FOR 250-C18 CEB-142 WAS OCTOBER 15, 1978.
B.
Compressor Cleaning. Clean the compressor to regain lost performance due to buildup of dirt. Do
not spray cleaning solution into a hot engine. The engine temperature should be satisfactory for
cleaning when the bare hand can be placed on the outer combustion case without discomfort.
Clean the compressor as follows:
(1) The solution for cleaning the compressor blading consists of an approved cleaner and water
(distilled if available).
(Refer to Table 1)
(2) Remove the fuel system and bleed valve Pc sensing lines at both end connections. Removal
of the Pc lines will prevent compressor cleaning solution from entering the fuel control/governor
and the bleed valve pneumatic circuits. Cap and plug the disconnected fittings to prevent
contamination of the pneumatic system and to prevent compressor cleaning solution from
spraying into the engine compartment.
(3) Make sure the anti-icing valve is in the “OFF” positon.
(4) Make sure the engine ignition circuit breaker is pulled.
(5) Block the bleed valve in the closed position using the 6798861 compressor protector cleaning
kit. Use the 0.38 in. (9.7 mm) wedge dimension for the 6870460 bleed valve or the 0.50 in.
(12.7 mm) wedge dimension for the 6874979 bleed valve (See FIG. 4). Disconnect any
airframe installed bleed air system (heaters, environmental control units, etc) that may be
damaged or contaminated by the compressor cleaning solution. Cap or plug all disconnected
fittings.
CAUTION: DO NOT EXCEED 10% N1 RPM MOTORING SPEED DURING CLEANING OR
RINSING CYCLES. DO NOT INJECT A SOLID STREAM OF FLUID INTO THE
COMPRESSOR.
CAUTION: BE SURE THE IGNITION CIRCUIT BREAKER IS PULLED TO PREVENT
IGNITION DURING THE RINSE CYCLE.
(6) Spray at least one quart (0.95 liters) of the cleaning solution into the compressor inlet while
motoring the engine with the starter without ignition. Inject solution with an aspirator or sprayer
equipped with a quick opening valve. Start injection three seconds prior to starter engagement
and disengage starter at 10% N1 rpm. Inject one quart (0.95 liters) in 9 to 11 seconds to
maintain speed below 10% for duration of injection. Repeat injection cycle as necessary to
clean compressor.
NOTE: Use of a steam powered aspirator and hot water is desirable if available.
(7) After injection of cleaning solution, spray steam or clean water (distilled preferred) into the
compressor inlet. Start injection three seconds prior to starter engagement, injecting one pint
to one quart (0.47-0.95 litres) in approximately 5 to 10 seconds, and again disengaging starter
before speed accelerates above 10% N1 rpm.
(8) If power is not restored after the compressor has been cleaned with an approved cleaner,
reclean as follows:
(a) Remove one case half and clean the blades and vanes with a small brush (toothbrush)
and a mild dishwashing detergent, Lux or equivalent. Refer to Compressor Case
Replacement.
(b) Reinstall the cleaned case half. Remove the second (dirty) case half. Clean blades and
vanes and replace case half in the same manner as used with the first case half.
Page 36
May 15/00
(9) Clean the bleed valve. (Applicable to bleed valve, P/N 6874979 only.) (Refer to Bleed Valve
Cleaning.)
WARNING: FAILURE TO PROPERLY INSTALL, ALIGN, AND TORQUE FUEL, OIL, AIR
FITTINGS AND TUBES COULD RESULT IN AN ENGINE FAILURE.
(10) Reconnect all pressure sensing lines and airframe bleed air plumbing. Tighten Pc line coupling
nuts to 80-120 lb in. (9.0-13.6 N.m). Start and operate the engine for a minimum of five
minutes. Operate the engine anti-ice system to purge any compressor cleaning solution from
the compressor inlet housing. Operate all aircraft systems that utilize compressor bleed air.
Complete the engine drying run as soon as possible after cleaning and rinse.
Bleed Valve Wedge
FIG. 4
Page 37
May 15/00
1.
Air Sensing Tube
3. Jam Nut
5. Internal Retaining Ring
7. Jet
2.
Elbow
4. O-Ring
6. Filter
8. Nozzle
Bleed Valve Jet and Nozzle Removal
FIG. 5
C. Bleed Valve Cleaning. Clean the bleed valve nozzle, filter, and jet as follows:
(1) Remove the air sensing line from the bleed valve elbow. (Ref. FIG. 38.)
(2) Remove the elbow from the bleed valve. Discard the O-ring.
(3) Remove the internal retaining ring and separate the filter from the bleed valve. (Ref. FIG. 5.)
Replace the retaining ring before assembly if it is damaged during the removal operation.
(4) Using a screwdriver, remove the jet from the bleed valve.
(5) Clip the lockwire then remove the nozzle from the bleed valve.
CAUTION: DO NOT BLOW THE JET DRY. THE SMALL JET CAN BE EASILY LOST OR
DAMAGED.
(6) Clean the nozzle, filter, and jet ultrasonically in mineral spirits if equipment is available. If
ultrasonic equipment is not available, agitate the parts in a clean container of mineral spirits.
Use a soft bristle brush to clean exposed surfaces. Insert a sewing thread through the jet
hole. Slide the jet back and forth on the thread to remove film. Clean the nozzle in the same
manner.
NOTE: If the jet must be replaced, return the bleed valve to overhaul for part replacement
and recalibration of the valve assembly.
Page 38
CAUTION: DO NOT USE A PROBE TO REMOVE PARTICLES LODGED IN THE JET OR
NOZZLE.
(7) Inspect the jet and the nozzle using a flashlight. Position the part on the center of the lens so
the light can be seen through the hole. Reclean the part if any particles or coating can be
seen.
(8) Install the jet in the bleed valve. Torque to 8-12 lb in. (0.90-1.36 N.m).
(9) Position the filter in the bleed valve, skirt end first. Secure with an internal retaining ring.
(10) Install the nozzle in the bleed valve. Torque to 50-60 lb in. (5.6-6.8 N.m) and secure with
lockwire.
(11) Lubricate the O-ring and install it with the elbow on the bleed valve. Do not tighten the elbow
jam nut at this time.
WARNING: FAILURE TO PROPERLY INSTALL, ALIGN, AND TORQUE FUEL, OIL, AIR
FITTINGS AND TUBES COULD RESULT IN AN ENGINE FAILURE.
(12) Position the elbow as required and install the air sensing line. Torque the coupling nut to
80-120 lb in. (9.0-13.6 N.m). Torque the elbow jam nut to 55-80 lb in. (6.2-9.0 N.m).
D.
Compressor Salt Water Contamination Removal
WARNING: SALT LADEN HUMIDITY AND CHEMICALS WILL CORRODE COMPRESSOR
BLADES AND VANES AND CAUSE THEM TO FAIL.
(1) Engines subjected to salt water or other chemically laden atmosphere (including pesticides,
herbicides, and industrial pollution) shall undergo water rinsing after shutdown following the
last flight of the day. Perform the rinse operation as soon as practical after flight, but not
before the engine has cooled to near ambient temperature.
NOTE: Operators should be aware that salt or chemically laden air may be encountered for
75-150 miles from the source under certain weather conditions. If there is any doubt
about the conditions in which your engines are operated, the compressors should be
given a daily water rinse. Water will not damage the engine but salt and chemicals will.
(2)
Precautions to be observed during the spray rinse:
CAUTION: THE PC TUBE FROM THE SCROLL TO THE PC FILTER SHOULD NOT BE
REMOVED WHEN PERFORMING THE DAILY WATER RINSE.
CAUTION: BE SURE THE IGNITION CIRCUIT BREAKER IS PULLED TO PREVENT
IGNITION DURING THE RINSE CYCLE.
(a) Do not loosen or disconnect any pneumatic or fuel lines in performing the water rinse.
(b) Never perform the rinse procedure while the engine is operating: the compressor blades
and vanes will be damaged. A motored rinse utilizing the starter with N1 speed below
10% is the only authorized procedure for the model 250-C18 Series engine.
(c) N1 speed must not exceed 10% rpm during water spray injection.
(d) Use the highest quality water available.
(e) Do not spray water into a hot engine. The engine temperature should be satisfactory for
water rinse when the bare hand can be placed on the outer combustion case without
discomfort.
(f)
Avoid conditions which would allow the rinse water to freeze.
NOTE: Methyl alcohol may be added to the water to prevent freezing during water rinse
in below freezing weather. Mix one part methyl alcohol to one part water. This
mixture prevents freezing down to -40°C(-40°F). The methyl alcohol shall
contain methanol in concentrations not less than 99.85% by volume.
(See Table 1)
Page 39
CAUTION: BE SURE THE IGNITION CIRCUIT BREAKER IS PULLED TO PREVENT
IGNITION DURING THE WASH CYCLE WHEN THE METHYL ALCOHOL MIX
IS USED.
(g) Do not inject a solid stream of water into the engine. The nozzle must provide a diffused
spray pattern.
(h) Hold the nozzle so that the spray is centered around the bullet nose of the inlet to ensure
that all of the spray is injected into the engine. Spray a minimum of one quart (0.95 litres)
into the compressor; there is no maximum limit.
E.
Materials And Equipment
NOTE: The highest quality water available must be used.
(1)
The most rapid and economical means to assess water quality is by measuring electrical
conductivity. Control of electrical conductivity to a specific low level will automatically yield a
low level of chlorides, sulfates, sodium, and other elements. Distilled, demineralized, or
deionized water with a maximum electrical conductivity of 3 micro-ohms per cubic centimeter
would be theoretically ideal. However, a more practical level of 20 micro-ohms per cubic
centimeter maximum would control the above impurities to a level of less than 10 ppm.
NOTE: Most water deionizing equipment has the capability to determine electrical
conductivity. Commercially purchase deionized/demineralized water, conductivity
information should be requested from the vendor.
(2)
Should the electrical conductivity of the water not be known, the use of distilled, demineralized,
or deionized water is preferred.
(3)
The source of pressure most readily available is a water supply system, which usually has
40-70 psi (276-483 kPa) pressure. Portable equipment using air pressure up to 100 psi (689
kPa) is also satisfactory for use.
(4)
The spray nozzle shall provide a diffused spray of water at a flow rate of one quart (0.95 litres)
in nine to eleven seconds at the pressure conditions used during compressor rinse. The
nozzle should be sized to provide the proper flow rate at the average pressure maintained
during each rinse cycle.
NOTE: Test for proper water flow at the pressure to be used by placing the nozzle in a large
container so that no water can splash out. Time the flow for 10 seconds and
measure the quantity collected. Proper nozzle size for the pressure used should
accumulate 1 to 1-1/8 quarts (0.95-1.07 litres). Adjust nozzle size as necessary to
meet the specified flow limits.
(5)
A quick opening valve shall be installed in the supply tube as close to the nozzle as practical.
(6)
6798861 Compressor Cleaning Protector Kit (bleed valve wedge).
(7)
Spray rinse procedure:
(a) Make sure the anti-ice valve is in the “OFF” position.
(b) Make sure the engine ignition circuit breaker is pulled.
(c) Block the bleed valve in the closed position using the wedge in 6798861 compressor
cleaning protector kit.
(See FIG. 4) It is not necessary to disconnect any lines.
Page 40
May 15/00

 

 

 

 

 

 

 

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