Piston Ring Installation - Polaris RZR PRO R Service Manual

11. Inspect for proper valve key seating.
12. Install the remaining valves, springs, and other
components.
13. Install the cylinder head air vent fitting
to specification.
If re-using fitting, apply a dab of Loctite 565 or
equivalent thread sealant to fitting threads.
TORQUE
Coolant Vent Fitting:
106 in-lbs (12 N·m)
9940259 R02 - 2022 RZR PRO R / PRO R 4 Service Manual
© Copyright Polaris Industries Inc.

PISTON RING INSTALLATION

Apply clean engine oil to all ring surfaces and ring lands
q
and torque upon installation. Always check piston ring installed gap
before rings are installed on piston. Refer to PISTON
RING INSTALLATION GAP procedure. Clean
accumulated carbon from piston ring grooves and oil
ring lube holes if piston has been in service.
q
Top Ring
w
Second Ring
e
Upper Rail
1. Place oil control ring expander in oil ring groove.
Rotate expander in groove until butt ends are on PTO
side of piston (see illustration below).
Ends must butt squarely together and must not overlap.
2. Install lower rail with end gap positioned on the intake
side of piston.
ENGINE / COOLING SYSTEM
IMPORTANT
r
Spring Expander
t
Lower Rail
NOTICE
3
3.85