Snowmobile Arctic Cat (2008 year). Manual - part 67

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9. Place the impeller into position and secure with a

cap screw and washer. Be sure the rubber side of

the washer is directed towards the impeller. Apply

blue Loctite #243 to the threads of the cap screw

and tighten to 8 ft-lb.

FS225

10. Apply sealant to the crankcase seam; then install

the alignment pins into the crankcase (if removed).

FC133A

11. Position the O-ring into the water pump cover;

then install the cover. Install the cap screws; then

using the pattern shown, tighten to 8 ft-lb.

0742-257

Pressure Testing Engine

1. Test the engine for air leaks using the following

procedure and Engine Leak-Down Tester Kit.

A. Install a plug into each intake-manifold port

and tighten the flange clamps securely.

B. Place a rubber plug and cover on each exhaust

port and secure.

„NOTE: On APV equipped engines, install the APV
cover plates.

C. Connect the tester pump to an impulse fitting

on the crankcase; then plug any remaining

impulse fittings and pressurize the crankcase to

8 psi and close the valve.

AN128D

D. Monitor the pressure gauge. The pressure must

not drop at a rate of more than 1 psi per minute.

E. If the pressure drops faster than specified,

inspect for an air leak with soapy water or by

completely submerging the pressurized engine

in clean fresh water. Repair as needed.

Liquid Cooling System

(500/600/800/1000 cc)

The liquid cooling system consists of heat exchangers,

water pump, coolant temperature sensor, and thermo-

stat. The system should be inspected for leaks or dam-

age whenever an overheating problem is experienced.

DRAINING COOLING SYSTEM 
(Crossfire/M-Series)

1. Using a piece of cardboard to protect the hood and

belly pan, tip the snowmobile on its PTO-side.

2. From beneath the front end, remove the self-tap-

ping screws securing the skid plate to the chassis.

! CAUTION

DO NOT exceed 8 psi pressure or damage to the
seals will result.

! CAUTION

When submerging the engine to test for air leaks, all
external electrical components must be removed to
avoid damage.

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3. Loosen the clamp securing the throttle body cool-

ant hose to the water pump. Do not remove the

hose from the water pump at this time.

CM201A

„NOTE: The hose clamp to loosen is from the ver-
tical fitting. Do not remove the hose from the 90°
fitting.

4. Tip the snowmobile upright; then place a suitable

drain pan beneath the engine. Remove the coolant

hose from the water pump and allow the coolant to

drain.

5. After the coolant has completely drained, install

the coolant hose onto the water pump and secure

with the clamp.

6. Install the skid plate and secure with the self-tap-

ping screws.

DRAINING COOLING SYSTEM 

(F-Series/T-Series)

1. Open the hood and remove the left-side access

panel and the belt guard; then remove the torx-

head screws securing the console.

741-722A

2. Lift the rear of the console and disconnect the con-

sole/main harness plug-in; then remove the con-

sole.

3. Using a small vise-grip pliers, clamp off the cool-

ant hose connected to the PTO-side throttle body;

then loosen the hose clamp.

FS236A

4. Place a towel beneath the coolant hose and remove

the hose from the throttle body.

5. Using Vacuum Test Pump and proper-sized hoses,

connect the pump to the throttle body coolant

hose.

6. Remove the vise-grip pliers from the coolant hose

and the cap from the coolant tank; then pump the

coolant from the system.

FILLING COOLING SYSTEM

1. Elevate the front of the snowmobile 30-60 cm (12-

14 in.).

2. Remove the coolant tank cap and check coolant

level. The coolant tank should be filled to the cool-

ant level line.

3. Install the coolant tank cap; then start the engine.

Run the engine at 3000-3500 RPM until the bot-

tom heat exchangers become hot to the touch. Stop

the engine and allow the system to cool.

„NOTE: On the F-Series prior to starting the
engine, it is necessary to connect the console/
main harness plug-in and to place the console in
position. Do not secure the console with the torx-
head screws at this time.

4. Lower the front of the snowmobile and elevate the

rear of the snowmobile 12-14 in. Repeat the proce-

dures in step 3.

5. Check the coolant level. Add coolant as required

to the coolant tank (coolant tank should be filled to

coolant level line). Repeat procedure until coolant

level stabilizes in the coolant tank.

! CAUTION

Be sure the cooling system is thoroughly filled using
the following procedure.

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„NOTE: If coolant is required, mix coolant for a
temperature of -36°C (-34°F). Follow mixing recom-
mendations of the manufacturer of the coolant.

„NOTE: At this point, secure the console with the
torx-head screws.

INSPECTING COOLANT HOSES 
AND CLAMPS

All coolant hoses and connections should be checked

annually for deterioration, cracks, and wear.

All coolant hoses and clamps should be replaced every

four years.

INSPECTING THERMOSTAT

1. Inspect the thermostat for corrosion, wear, or

spring damage.

2. Using the following procedure, inspect the ther-

mostat for proper operation.

a. Suspend the thermostat in a container filled

with water.

b. Heat the water and monitor the temperature

with a thermometer.

c. The thermostat should open at 50°C (122°F).

Once the thermostat starts to open, IMMEDI-

ATELY remove the thermostat as it will lock in

the open position if allowed to open fully.

„NOTE: The thermostat is of the lock-open type. If
the thermostat is ever allowed to fully open, it will
remain open and replacement will be necessary.

! CAUTION

It is extremely important that the Filling Cooling Sys-
tem procedure is followed very closely and the cool-
ing system is properly filled. If the system isn’t
properly filled, piston damage will occur.

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Cooling System 

Schematics

The following schematics are representative of the different styles of cooling systems in the Arctic Cat snowmo-

biles. Some components may vary from model to model; therefore, the technician should use discretion and sound

judgment when servicing a particular cooling system.

0742-314

738-067A

F-Series/T-Series

Crossfire/M-Series