Polaris 850 PRO-RMK 155 2.6" QD 2021, Manual

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9850060 R02 - 2020-2021 850 AXYS™ Long Track Snowmobile Service Manual
© Copyright Polaris Inc.
3.81
PISTON NEEDLE BEARING
1. Clean the end of the connecting rod and inspect inner
bore with a magnifying glass. Look for any surface
irregularities including pitting, wear, or dents.
2. Run a fingernail around the inside of the rod and
check for rough spots, galling, or wear.
3. Oil and install needle bearing and pin in connecting
rod.
4. Rotate pin slowly and check for rough spots or any
resistance to movement.
5. Slide pin back and forth through bearing while
rotating and check for rough spots.
6. With pin and bearing centered in rod, twist ends back
and forth in all directions to check for excessive axial
play.
7. Pull up and down evenly on both ends of pin to check
for radial play.
8. Replace pin and bearing if there is any resistance to
rotation or excessive axial or radial movement. If play
or roughness is evident with a new pin and bearing,
replace the connecting rod.
ENGINE / COOLING / EXHAUST