Page 224 - Manual_Polaris_RZR_ProXP-20-21

ENGINE / COOLING SYSTEM

PISTON RING INSTALLATION 3. Install upper rail with end gap positioned on the
exhaust side of piston i.
NOTICE
4. Install second compression ring with marking facing
Apply clean engine oil to all ring surfaces and ring lands top of piston o. Rotate ring to position the end gap
upon installation. Always check piston ring installed gap toward intake side of piston as shown below.
before rings are installed on piston (see Piston Ring
Installed Gap page 3.75). Clean accumulated carbon
from piston ring grooves and oil ring lube holes if piston
has been in service.

5. Install top compression ring with marks facing top of
piston a. Rotate ring to position the end gap toward
exhaust side of piston as shown below.
q Top Ring r Spring Expander

w Second Ring t Lower Rail

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 y.
NOTICE
Ends must butt squarely together and must not overlap.

2. Install lower rail with end gap positioned on the intake
side of piston u. 6. Be sure top and second rings rotate freely in their
grooves and do not bind when compressed by hand.

3.80 9930583 R01 - 2020-2021 RZR PRO XP / XP 4 Service Manual
© Copyright Polaris Industries Inc.