Piston Ring Installed Gap; Coolant Level; Recommended Coolant; Cooling System Bleeding - Polaris 2007 Two Stroke Service Manual

Piston Ring Installed Gap

Position the ring .50" (1.3 cm) from the top of the cylinder using
the piston to push it squarely into place. Measure installed gap
with a feeler gauge at both the top and bottom of the cylinder.
NOTE: A difference in end gap indicates cylinder
taper. The cylinder should be measured for
excessive taper and out of round. Replace rings if
the installed end gap exceeds the service limit.
Always check piston ring installed gap after re-
boring a cylinder or when installing new rings.
Piston rings are installed with marking or beveled side up see
diagram above.

Coolant Level

Coolant level in the coolant bottle must be maintained to prevent
overheating and serious engine damage. Check the coolant with
the engine temperature cold. The coolant level should be at the
FULL COLD level mark. If it is not add coolant to the FULL
COLD mark on the bottle. If you have coolant over the FULL
COLD level you may have air in the system and need to "bleed"
the air out of the system.

Recommended Coolant

Polaris snowmobiles use a premium 60/40 pre-mix antifreeze.
This premium antifreeze is mixed with deionized water for
better protection for aluminum cooling. This pre-mix is good for
temperatures down to -62°F (-52°C). Replace coolant every 2
years or if contaminated.

Cooling System Bleeding

1. Allow the cooling system to cool completely.
2. Check the coolant reservoir and make sure it is at the FULL
COLD mark.
3. Place the snowmobile in its normal riding position and
apply the parking brake and run the engine at the specified
idle RPM until the thermostat opens up.
4. Elevate the front of the machine slightly.
5. Open the bleed screw (A) at the top of the water outlet
manifold.Only open slightly, do not remove the screw.
A
500 Fuji
500/600/700 Liberty
6. Cycle the RPM from idle to 3000-4000 so that the coolant
can move around the system and push out the air from the
system.
7. Tighten the bleed screw when coolant starts to come out of
the screw area.
8. Turn off the machine and release the parking brake.
9. Allow the system to cool completely and recheck the
coolant level.
NOTE: It is important that the thermostat stays open
@ 120° F (50° C).When the thermostat opens it will
draw in cold coolant from the heat exchangers and
the cold coolant may close the thermostat again.
MAINTENANCE
A
3.7
3