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9850043 R01 - 2017-2021 RANGER 500 / 570 Service Manual
© Copyright Polaris Inc.
PISTON / ROD INSPECTION
1. Measure piston pin bore inside diameter I.D.
Piston Pin Bore:
Std.: 0.8662 - 0.8665″ (22.004 - 22.010 mm)
Service Limit: 0.8651″ (21.975 mm)
2. Measure piston pin O. D. Replace piston and/or
piston pin if out of tolerance.
Piston Pin O.D.:
Std.: 0.8659 - 0.8661″ (21.995 - 22.0 mm)
Service Limit: 0.8651″ (21.975 mm)
3. Measure connecting rod small end ID. Inspect
bearing surface for damage.
Piston Pin Degree of Fit:
Pin should be a push-fit by hand with piston at room
temperature or warmed slightly
Connecting Rod Small End ID:
Std.: 0.8665 - 0.8670″ (22.010 - 22.023 mm)
4. Measure piston ring to groove clearance by placing
the ring in the ring land and measuring with a
thickness gauge. Replace piston and rings if ring-to-
groove clearance exceeds service limits.
Piston Ring-to-Groove Clearance
Top Ring:
Std.: 0.0011 - 0.0037" (0.030 - 0.095 mm)
Service Limit: 0.0042" (0.108 mm)
Second Ring:
Std.: 0.0007 - 0.0029" (.020 - 0.076 mm)
Service Limit: 0.0035" (0.89 mm)
ENGINE / COOLING SYSTEM
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