Mercedes-Benz ML320. Service manual - part 422

 

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Mercedes-Benz ML320. Service manual - part 422

 

 

Fig. 82: Identifying Valve Springs And / Or Valve Stem Seal Components - Shown On Engine 112 (1 Of 
2)
 

Shown on engine 112  

Shown on engine 112  

 

2004 Mercedes-Benz ML350 

1998-2005 ENGINE Engine timing - 163 Chassis

  

me 

 

Fig. 83: Identifying Valve Springs And / Or Valve Stem Seal Components - Shown On Engine 112 (2 Of 
2)
 

 

 

Remove/install

 

 

1

Remove engine cover or 
air filter

Remove engine trim 
panel or air filter by 
pulling it vertically up 
and off the cylinder head 
covers.

 

2

Remove viscous fan (1)

 Right-hand thread!

AR20.40-P-5660C 

3

Fan shroud (2)

 On model 163 

unscrew bolts at bottom 
of fan shroud.

 

Models 163.

AR20.40-P-5000GH 

Model 463.

AR20.40-P-6800V

4

Remove poly-V-belt (3)

 Installation: Lock 

tensioning device with a 
drift or pin (diameter 5 
mm).

AR13.22-P-1202B 

5

Remove cylinder head 
covers (6)

Air filter located at 
vehicle side.

AR01.20-P-5014B 

Air filter located on 
engine side.

AR01.20-P-5014BV 

 

Remove spark plugs (8)

Only one spark plug at 

each cylinder.

 

Models 163.

AP15.10-P-1580GH 

Models 129, 202, 208, 
210.

AP15.10-P-1580A

Model 463.

AP15.10-P-1580GA

7

Remove intake manifold 
(7)

 The intake manifold 

system must not be 
disassembled. 

 Remove intake 

manifold together with 
fuel rail.

 

Models 129, 163, 202, 
208, 210.

AR09.20-P-1310A 

Model 463.

AR09.20-P-1310AG

8

Position crankshaft to 40° 
after ignition TDC of 
cylinder 1

 Engine must not be 

cranked back!

AR05.10-P-6858V

9

Remove chain tensioner 
(5)

 

AR05.10-P-7800C

10

Remove camshaft 

 

AR15.10-P-2000A 

 

2004 Mercedes-Benz ML350 

1998-2005 ENGINE Engine timing - 163 Chassis

  

me 

 

position sensor (11)

11

Remove camshaft 
sprockets (10)

 Lock right and left 

camshaft with locating 
plates.

 

 Locating plate

Fig. 11

 Locating plate

Fig. 12

 Open-end wrench

Fig. 22

 Insertion tool

Fig. 66

 Torque wrench

001589722100

 

*BA05.20-P-1001-01B

After installation: ?

 

Inspect timing of engine. AR05.10-P-6858V
? If necessary after 
checking:

 

Set basic position of 
camshafts.

AR05.20-P-6020AU

12

Remove camshaft bearing 
bridges (9)

Engines 112, 113 except 
code (479) Cylinder 
shutoff.

AR05.20-P-7103AU

Engine 113 with code 
(479) cylinder shutoff.

AR05.20-P-7103AV

13

Position piston of cylinder 
to be processed to TDC

 Crank engine at 

crankshaft for this 
purpose and hold up 
timing chain (so that it 
does not jam). 

 Installation: Before 

installing the camshaft 
sprockets, again turn 
back the crankshaft in the 
starting position to 40 ° 
as per ignition TDC at 
the first cylinder.

 

14

Install retaining lock (13) 
for crankshaft

 After setting TDC of 

cylinder to be processed, 
in order to prevent 
crankshaft turning 
further.

AR03.30-P-5000B 

15

Connect up cylinder leak 
tester (12)

 Turn connection 

hose of cylinder leak 
tester into the relevant 
spark plug hole.

*WH58.30-Z-1015-05A

16

Pressurize compression 
chamber

With a pressure of about 
5 bar.

 

 

2004 Mercedes-Benz ML350 

1998-2005 ENGINE Engine timing - 163 Chassis

  

me 

 

 Camshaft 

17

Screw retaining fork and 
detent with hinged 
bearing into cylinder head

 Valve assembly tools 

case

Fig. 89

18

Attach detent depressor 
with lever handle and 
thrust piece into detent 
with hinged bearing, align

 Position thrust piece 

vertically at valve spring 
retainer and align parallel 
to detent with hinged 
bearing. 

 Valve assembly tools 

case

Fig. 89

19

Remove upper valve 
spring plate (16) and 
valve spring (17)

Do not allow valves to 

touch the piston crowns 
otherwise they will be 
bent. 

 Compress valve 

spring and remove valve 
collets with tweezers or 
magnetic finger. The 
valve springs of the inlet 
and exhaust valves are 
identical.

 

 

 

 Magnetic finger

Fig. 90

 

 

 Tweezers

*WH58.30-Z-1040-02A

20

Replace valve stem seals 
(18)

 Inspect surface of 

valve stems for 
roughness and formation 
of burrs (visual 
inspection or with a nail). 
Replace valves with a 
rough stem surface or 
formation of burrs: ?

AR05.30-P-3500-02A

Remove valves.

AR05.30-P-3511AV

21

Remove lower valve 
spring plate (19)

 

 

 

Checking 

 

 

22

Inspect top and bottom 
valve spring retainers (16, 
19)

 Inspect valve spring 

retainer for formation of 
burrs, replace if 
necessary.

 

23

Install in the reverse order  

 

Number

Designation

Engine 
112 

Engines 
113.940/941/ 

 

2004 Mercedes-Benz ML350 

1998-2005 ENGINE Engine timing - 163 Chassis

  

me 

 

 

 

 

 

 

 

 

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