9928487 R01 - 2018 RANGER XP 1000 Service Manual
© Copyright Polaris Industries Inc.
3.59
UPPER CRANKCASE PREPARATION
NOTE
Always replace plain bearings when the crankcase or
connecting rods have been disassembled. Refer to the
bearing selection chart provided in the
Main Bearing Selection”, page 3.58
and
“Connecting Rod Bearing Selection”, page 3.58
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 3.7
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.
PISTON RING INSTALLATION
NOTE
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 INSTALLATION GAP
procedure. Clean
accumulated carbon from piston ring grooves and oil
ring lube holes if piston has been in service.
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.