Snowmobile Arctic Cat (2008 year). Manual - part 90

6-4

739-040A

3. Secure the cam arm pins with new lock nuts and

tighten to 19 in.-lb.

4. Place the spring and cover into position making

sure the timing mark on the cover is properly

aligned; then compress the spring and install the

machine screws coated with blue Loctite #243 and

lock washers. In a crisscross pattern, tighten

evenly to 10 ft-lb.

MS402A

FC091

Installing

„NOTE: Before installing the drive clutch, be sure
to wipe both the crankshaft taper and clutch
mounting taper clean using a clean towel.

1. Place the drive clutch into position on the crank-

shaft and secure with the appropriate cap screw

and lock washer. Tighten to 55 ft lb.

2. Check alignment between the drive clutch and

driven pulley (see appropriate Drive Clutch/

Driven Pulley in this section).

AF468D

MS390

3. Install the drive belt. Check drive belt deflection

(see appropriate Drive Clutch/Driven Pulley in

this section). Secure the belt guard and install the

plug in the belly pan.

! CAUTION

It is critical that green Loctite #620 be applied to the
set screw holes in the cam arms or component dam-
age may occur.

! CAUTION

When installing cam arms, always use new lock nuts
and cam arm set screws.

! CAUTION

Care must be taken when installing the cover not to
damage the bushing.

! CAUTION

When installing the drive clutch, do not tighten the
cap screw with any kind of impact tool. Tighten cap
screw using a hand torque wrench only. Failure to
do so could result in stationary sheave damage.

! WARNING

Never operate the engine without the belt guard/side
panel secured.

6-5

6

4. Either test drive the snowmobile or run the engine

for five minutes; then verify the drive clutch cap

screw torque specification.

Roller Driven Pulley

 (STD)

REMOVING

1. Open the hood; then open the belt guard.

2. Remove the drive belt.

3. Remove the cap screw and washer securing the

driven pulley; then account for and note the posi-

tion of any alignment washers.

SC013D

4. Slide the driven pulley off the driven shaft; then

remove pulley from the engine compartment.

„NOTE: If the driven pulley is tight on the shaft,
pull the driven pulley off using the Driven Pulley
Puller.

5. Remove the key, alignment washers, and stub

shaft from the driven shaft.

AF120D

DISASSEMBLING

1. Scribe a line across all driven pulley components

to ensure correct assembly and pulley balance.

SC001D

2. Place the driven pulley on a work fixture so the

roller plate is directed upward.

SC002D

„NOTE: To aid in driven pulley servicing, use a roll
of duct tape as a work fixture. The work fixture will
increase the stability of the pulley during the repair
procedure.

3. Remove the three lock nuts securing the roller

plate; then carefully slide the plate off the station-

ary shaft allowing the spring to release tension.

SC003D

4. Remove the spring.

! WARNING

The roller plate is under spring pressure. Care must
be taken when removing the lock nuts to prevent the
plate from ejecting prematurely.

6-6

B458D

5. Slide the movable sheave off the stationary shaft;

then remove any thrust washers located between

the sheaves noting the position of washers for

assembling purposes.

B459D

B460

6. Remove the three socket head screws and lock

washers securing the torque bracket (cam) to the

stationary sheave; then remove torque bracket.

AI062

7. Place the roller plate on a work fixture (roll of duct

tape, etc.).

SC004D

8. Using a 1/8-in. punch, remove the spring pin

securing the roller, roller pin, and thrust washer to

the plate.

SC005D

9. Using the Roller Pin Removal Tool from inside the

plate, drive the roller pin out of the plate. Account

for the pin, thrust washer, and roller.

6-7

6

SC006D

SC007D

CLEANING AND INSPECTING

„NOTE: Whenever a part is worn excessively,
cracked, or damaged in any way, replacement is
necessary.

1. Using parts-cleaning solvent, wash grease, drive

belt dust, and foreign matter off all components.

2. Inspect the rollers for damage, cracks, or wear.

3. Inspect the sheaves for any gouges, cracks, or

other damage. Also, inspect threaded areas of

sheaves for damaged or stripped threads.

4. Inspect the torque bracket (cam) for cracks or

damage. The ramp portions of the bracket and

caps must be free of gouges and damage. Minor

scratches may be repaired using #320 grit wet-or-

dry sandpaper.

B465

5. Inspect spring for distortion, crystallization, or

breaks.

6. Inspect the roller plate, rollers, pins, and spring

mounting holes for cracks, damage, or wear.

7. Inspect the roller plate and movable sheave bear-

ings for wear. For each respective bearing, mea-

sure the outside diameter of the shaft and the

inside diameter of the bearing. Compare the read-

ings. Clearance between the shaft and the respec-

tive bearing must not exceed 0.5 mm (0.020 in.). If

the clearance exceeds the specification, the bear-

ing must be replaced.

B466D

B467

! CAUTION

Do not use steel wool or a wire brush to clean driven
pulley components. A wire brush or steel wool will
cause the sheaves to be gouged (thus, the drive belt
may not slide properly between sheaves). Decreased
performance and possible accelerated drive belt
wear will result.