3
9940259 R02 - 2022 RZR PRO R / PRO R 4 Service Manual
© Copyright Polaris Industries Inc.
3.57
PISTON RING REMOVAL
1. Carefully remove top compression ring
q
by hand or
using a ring removal pliers (PV-43570-1).
CAUTION
DO NOT expand the ring more than necessary to
remove it from the piston or the ring may break or lose
radial tension.
• Piston ring pliers: Carefully expand ring and lift it
off the piston.
• By hand: Placing both thumbs on the ring ends,
spread the ring open and push up on opposite side.
Do not scratch ring lands.
2. Repeat procedure for second compression ring
w
.
3. The oil control ring
e
is a three piece design
consisting of a top and bottom steel rail and a center
expander section. Remove top rail first, then bottom
rail, then the expander.
PISTON RING TO GROOVE CLEARANCE
INSPECTION
Measure piston ring to groove clearance
q
by placing
the ring in the ring land and measuring with a thickness
(feeler) gauge. Replace piston and rings if ring-to-groove
clearance exceeds service limits.
MEASUREMENT
Piston Ring to Groove Clearance:
Top Ring:
0.0012 - 0.0037” (0.030 - 0.095 mm)
Second Ring:
0.0012 - 0.0034” (0.030 - 0.086 mm)
Service Limit:
0.0059 in (0.15 mm)
ENGINE / COOLING SYSTEM
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