3.8
MAINTENANCE
PISTON RING INSTALLED GAP
Position the ring 1/2" (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.
• 60/40 Pre-mix Quart PN 2871534
• 60/40 Pre-mix Gallon PN 2871323
• 60/40 Pre-mix 2.5 Gallon PN 2872278
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. Open the bleed screw (A) at the top of the water outlet
Piston Ring
Feeler Gauge
1/2s (1.3cm.)
1/2s (1.3cm.)
Cylinder
Piston Ring
Straight Edge
Keystone Piston Ring Cutaway
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