Snowmobile Arctic Cat 2-Stroke (2007 year). Manual - part 19

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FC020

7. Remove the stator plate from the engine.

FC021

FC065

„NOTE: The stator plate screws had Loctite
applied to the threads during assembly. Using an
impact driver, apply a sharp blow to the head of
each screw to break the Loctite loose before
removal.

8. On the 600 cc, remove the cap screws securing the

APV assemblies to the cylinders; then remove the

APV assemblies and set them aside.

„NOTE: Note that the APV exhaust valves and
gaskets are directional for assembling purposes.

„NOTE: The following photographs are for clarity
purposes only. The models may vary slightly.

FC023

FC024

FC025

9. Remove the spark plugs.

10. Remove the cap screws with O-rings securing the

cylinder head; then separate from the cylinders.

Account for the O-rings.

11. Remove the oil-injection hose from each cylinder

and the crankcase nozzle.

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2

FC026

„NOTE: When removing the cylinders, place the
engine on its intake flanges on a drain tray to allow
residual coolant to drain from the cylinder/crank-
case water jacket.

12. On the 500 cc, remove the eight nuts securing the

cylinders to the crankcase; then using a rubber

hammer, gently tap the cylinders and remove from

the crankcase by lifting them straight up off their

studs. Account for gasket(s) and any alignment

pins.

13. On the 600 cc, remove the four nuts and four bolts

securing the cylinders to the crankcase; then using

a rubber hammer, gently tap the cylinders and

remove from the crankcase by lifting them straight

up off their studs. Account for gasket(s) and any

alignment pins.

FC067

FC027

14. Remove the PTO-side piston-pin circlip from the

PTO-side piston; then remove the MAG-side pis-

ton-pin circlip from the MAG-side piston.

FC028

15. Using Piston Pin Puller (p/n 0644-328), remove

the piston pins from both pistons.

„NOTE: For proper assembly, keep all MAG-side
components and all PTO-side components sepa-
rated. Assemble them on their proper sides.

FC029

16. Lift the pistons clear of the connecting rods and

remove the small-end connecting-rod bearings

(account for two washers); then remove the piston

rings. Keep each piston with its rings; keep each

piston pin and bearing together as a set.

! CAUTION

When removing a cylinder, be sure to support the
piston to prevent damage to the crankcase and pis-
ton.

! CAUTION

DO NOT use any type of punch to drive the piston
pin free of the piston; damage may result. Use a pis-
ton-pin puller only.

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CM151

„NOTE: On the 500 cc, place rubber bands over
the connecting rods and around the cylinder
studs. This will prevent the connecting rods from
damaging the crankcase. On the 600 cc, use rub-
ber hoses to secure the connecting rods.

17. Remove the intake flanges and reed valve assem-

blies.

FC030

18. Remove the three cap screws securing the thermo-

stat cap; then remove the cap, gasket, and thermo-

stat.

FC032

19. Remove the six screws securing the water pump

cover to the crankcase and remove the cover.

Account for the O-ring gasket and the alignment

pins.

20. Remove the cap screw securing the water pump

impeller; then slide the impeller free of the shaft.

21. Remove either lower union cap screw securing the

lower check valve assembly; then remove the two

screws securing the oil-injection pump to the

crankcase. Remove the pump, retainer, and O-ring.

FC031

22. Turn the engine upside down on support blocks

and remove the coolant temperature sensor switch.

FC033

23. With its bottom side up on two support blocks,

remove the cap screws securing the crankcase

halves.

„NOTE: The end bearings are not pressed onto
the crankshaft.

24. Separate the crankcase halves by installing two

crankcase cap screws in opposite corners leaving

the heads approximately 6 mm (1/4 in.) out. Using

a plastic hammer and lifting on the ends of the

crankshaft, tap on each cap screw head until the

case halves separate. Remove the cap screws.

! CAUTION

DO NOT drive any tool between halves to separate
the crankcase. Damage to the sealing surfaces will
result.

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2

FC034

25. Lift the bottom half of the crankcase off the top

half.

26. Lift the crankshaft free from the top half of the

crankcase and slide the crankshaft oil seals off the

crankshaft. Account for the C-ring. Remove the

bearing retaining pins and account for the crank-

case dowel pins.

27. Remove the oil-injection pump/water pump drive-

shaft from the lower crankcase half. Account for

the thrust washer on the outer end of the shaft.

FC035

„NOTE: Do not replace the inner seals unless the
water pump shows signs of leaking coolant out of
the small bleed hole in the bottom half of the
crankcase. If a water pump seal is to be replaced,
use the Water Pump Bearing and Seal Kit (p/n
0644-084).

28. Place the crankcase on the bench with the water

pump side down. Using the long seal driver, drive

the mechanical water pump seal from the crank-

case.

FC036

29. Using a pair of snap ring pliers, remove the snap

ring securing the inner seal in the crankcase.

30. Using the hooked end of the tool, pull the inner

seal free of the crankcase.

31. Using the hooked end of the tool, pry the seal ring

from the backside of the water pump impeller.

AN327D

Servicing Top-Side 

Components 

Many services can be performed without removing the

engine. Some components may vary from model to

model. The technician should use discretion and sound

judgment when removing and installing components.

„NOTE: Some photographs used in this sub-sec-
tion are used for clarity purposes only and are not
designed to depict actual conditions.

REMOVING TOP-SIDE 

COMPONENTS

To access top-side components, use the following pro-

cedure:

1. Remove the expansion chamber and resonator;

then remove the exhaust manifold.

! CAUTION

Care must be taken to not allow the connecting rods
to drop onto the sealing surface of the bottom case
half.