Snowmobile Arctic Cat 2-Stroke (2007 year). Instruction - part 8

 

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Snowmobile Arctic Cat 2-Stroke (2007 year). Instruction - part 8

 

 

2-18

Cylinder Head Volume 

Specifications

„NOTE: For cylinder head volume tests, see appropriate Measuring Critical Components sub-section.

Engine Piston Travel 

Versus Crank Angle 

Chart

„NOTE: When using any of the charts blow, first know the engine stroke and timing in degrees; then select
the proper chart and read across from the degree figure to find timing in either mm or inches.

ENGINE TYPE

SQUISH - GAP

370 cc

mm

2.27-2.95

in.

.089-.116

500 cc

mm

1.5

in.

.059

570 cc

mm

1.69

in.

.066

600 cc 

mm

1.5

in.

.059

800 cc 

mm

1.5

in.

.059

1000 cc

mm

1.49

in.

.058

! CAUTION

These specifications are not intended to be used for
engine modification. Reducing the head volume to a
smaller specification could cause piston detonation
problems which is not a warranty situation.

500 cc

600/800 cc

370 cc 

570 cc

1000 cc

63 mm stroke

70 mm stroke

65 mm stroke

66 mm stroke

78 mm stroke

Degree 

BTDC

mm BTDC in. BTDC mm BTDC in. BTDC mm BTDC in. BTDC mm BTDC in. BTDC mm BTDC in. BTDC

12

0.867

0.034

0.969

0.038

0.901

0.035

0.917

0.036

1.062

0.042

15

1.351

0.053

1.509

0.059

1.403

0.055

1.429

0.056

1.655

0.065

18

1.937

0.076

2.164

0.085

2.012

0.079

2.049

0.081

2.374

0.093

20

2.384

0.094

2.663

0.105

2.476

0.097

2.522

0.099

2.869

0.113

2-19

2

Crankshaft Runout/

Repair Specifications

For those who have crankshaft work sent out to

another shop, it is advisable to provide them with this

information.

To use the specifications, first refer to the drawing;

then find the letter which indicates the specification

and refer to the chart below the illustration. Be sure to

note the proper engine column. Specifications are

called out in both millimeters and inches.

„NOTE: We have given the proper location for
checking crankshaft runout as the very edge of the
straight portion of the shaft where the oil seal
makes contact. From the illustration, note that Arc-
tic Cat has called out three check points: at either
end, out on the taper as shown, and also on the
center bearing race. The crankshaft is still sup-
ported on the outer bearings using V blocks. The
maximum runout shouldn’t exceed 0.05 mm (0.002
in.).

728-144A

„NOTE: Measure in from the shaft end the specified amount when checking runout at points D and F.
When checking runout in the center, place indicator on center of bearing as shown at Point E. Maximum
runout at any of the 3 measuring points is ±0.05 mm (0.002 in.).

Engine

Bore X

Stroke

A

B

C

G

Runout D

and F Point

(± .002)

370 cc

mm
(in.)

60 X 65

100 ± 0.15
(3.937 ± 0.006)

55 ± 0.15
(2.165 ± 0.006)

100
(3.937)

22
(0.866)

D 35
(1.377)

F 22
(0.866)

(± .002)

500 cc

mm
(in.)

71 X 63

114.7 ± 0.15
(4.515 ± 0.006)

66.5 ± 0.15
(2.618 ± 0.006)

106 ± 0.4
(4.465 ± 0.015)

27
(1.062)

D 5
(0.196)

F 5
(0.197)

(± .002)

570 cc

mm
(in.)

73.8 X 66

119 ± 0.15
(4.70 ± 0.006)

62.3 ± 0.15
(2.45 ± 0.006)

109.7
(4.320)

24
(0.945)

D 30
(1.181)

F 15
(0.590)

(± .002)

600 cc 

mm
(in.)

73.8 X 70

119.7 ± 0.15
(4.712 ± 0.006)

64 ± 0.15
(2.519 ± 0.006)

118 ± 0.4
(4.645 ± 0.015)

30
(1.181)

D 5
(0.196)

F 5
(0.196)

(± .002)

800 cc

mm
(in.)

85 X 70

120.7 ± 0.15
(4.751 ± 0.006)

64 ± 0.15
(2.519 ± 0.006)

118 ± 0.4
(4.645 ± 0.015)

30
(1.181)

D 5
(0.196)

F 5
(0.196)

(± .002)

1000 cc

mm
(in.)

90.3 X 78

129.6 ± 0.15
(5.10 ± 0.006)

71 ± 0.15
(2.79 ± 0.006)

128 + 0-0.4
(5.04 + 0-0.015)

32
(1.26)

D 5
(1.196)

F 5
(0.196)

2-20

Engine - 

Panther 370/Z 370

This engine servicing sub-section has been organized

to show a progression for the complete servicing of the

Arctic Cat 370 cc engine. For consistency purposes,

this sub-section shows a complete and thorough pro-

gression; however, for efficiency it may be preferable

to remove the engine as a complete assembly, to

remove and disassemble only those components which

need to be addressed, and to service only those compo-

nents. Also, some components may vary from model

to model. The technician should use discretion and

sound judgment.

„NOTE: Critical torque specifications can be
found on pages 6-7 of this section.

„NOTE: Some illustrations and photographs used
in this section are used for clarity purposes only
and are not designed to depict actual conditions.

Table of Contents

Removing .............................................................. 2-20
Disassembling....................................................... 2-22
Cleaning and Inspecting ....................................... 2-25
Measuring Critical Components............................ 2-28
Assembling............................................................ 2-30
Installing ................................................................ 2-33

Removing Engine

„NOTE: If equipped with electric start, disconnect
the battery.

1. Turn the gas tank shut-off valve to the CLOSED

position.

2. Open the belt guard.

3. Remove the drive belt; then remove the plug from

the belly pan.

„NOTE: Before installing the clutch puller, apply
oil to the threads of the puller and a small amount
of grease to the tip of the puller.

4. Remove the bolt and lock washer securing the

drive clutch to the crankshaft; then using the Drive

Clutch Puller (p/n 0644-207) and an impact

wrench or a breaker bar and Drive Clutch Spanner

Wrench (p/n 0644-136), tighten the puller. If the

drive clutch will not release, sharply strike the

head of the puller with a hammer. Repeat this pro-

cedure until the clutch releases.

CM006

CM007

5. Remove the clutch from the engine compartment.

6. Remove the cap screw and washer securing the

driven pulley; then slide the pulley off the driven

shaft. Account for and note the position of any

alignment washers.

„NOTE: If the driven pulley will not slide off the
driven shaft, use the Driven Pulley Puller (p/n
0744-023) for removal.

SC013D

7. Loosen the torque bumper from the engine mount.

8. Remove the springs securing the expansion cham-

ber to the exhaust manifold and resonator; then

remove expansion chamber.

2-21

2

MS368

9. Remove the cap screws and lock washers securing

the recoil starter; then remove the starter. Leave it

in the engine compartment.

AB082

10. Disconnect the four-prong main wiring harness

connector and the CDI unit wiring harness.

11. Disconnect the impulse hose from the crankcase.

12. Disconnect the spark plug caps.

13. Loosen the carburetor flange clamp. Remove the

carburetor from the intake flange and carburetor

boot. Place the carburetor to the side in an upright

position.

„NOTE: If equipped with electric start, remove the
lock nut and washer securing the ground cable to
the starter motor and loosen the two Allen-head
cap screws securing the flex-drive to the starter
motor; then remove the cap screws securing the
starter motor to the chassis. Remove the starter
motor.

MS369A

MS370A

14. Disconnect the oil-injection cable from the oil-

injection pump. Account for the E-clip and

washer; then disconnect the oil supply hose from

the pump and plug the hose to prevent leakage.

AB081

15. Remove the cap screws securing the engine to the

chassis. Account for washers, cap screws, and lock

nuts.

 

 

 

 

 

 

 

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