Upper Crankcase Preparation; Piston Ring Installation - Polaris RANGER XP 900 2018-2019 Service Manual

ENGINE / COOLING / HVAC SYSTEM

UPPER CRANKCASE PREPARATION

IMPORTANT
Always replace plain bearings when the crankcase or
connecting rods have been disassembled. Refer to the
bearing selection chart provided in the "Crankshaft
Main Bearing Selection"page 3.65 and "Connecting
Rod Bearing Selection"page 3.65 procedures.
1. Remove all traces of crankcase sealer from the
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"page 3.30 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.
3.66

PISTON RING INSTALLATION

IMPORTANT
Apply clean engine oil to all ring surfaces and ring lands
upon installation. Always check piston ring installed gap
before rings are installed on piston. Refer to "Piston
Ring Installed Gap"page 3.61 procedure. Clean
accumulated carbon from piston ring grooves and oil
ring lube holes if piston has been in service.
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.
9929399 R01 - 2018-2019 RANGER XP/ CREW 900/1000 Service Manual
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