Page 162 - Manual Oficina Polaris RS1 2018 e 2019

ENGINE / COOLING SYSTEM

UPPER CRANKCASE PREPARATION PISTON RING INSTALLATION

NOTE NOTE
Always replace plain bearings when the crankcase or Apply clean engine oil to all ring surfaces and ring lands
connecting rods have been disassembled. Refer to upon installation. Always check piston ring installed gap
bearing selection procedures. before rings are installed on piston (see Piston Ring
Installed Gap). Clean accumulated carbon from piston
ring grooves and oil ring lube holes if piston has been in
1. Remove all traces of crankcase sealer from the service.
crankcase mating surfaces. Inspect the surfaces
closely for nicks, burrs or damage.
2. Clean bolt hole threads to remove any oil or
crankcase sealant.
3. Inspect crankcase bearing bores. Replace the
crankcase assembly if a bearing bore is galled or if
bearing inserts have rotated in the case.
4. Be sure alignment pins are in place where used.
5. Refer to “Engine Oil Flow Chart” at the beginning of
this chapter and trace the oil paths through the
crankcase and cylinder.
6. Flush all oil passages with solvent and then warm
soapy water. Rinse with clear, warm water and dry
with compressed air.
7. Be sure passages are clean and dry before
assembling the upper crankcase.

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 (see illustration below).
NOTE
Ends must butt squarely together and must not overlap.

2. Install lower rail with end gap positioned on the intake
side of piston.

3.76 9928689 - 2018 RZR RS1 Service Manual
© Copyright Polaris Industries Inc.