Engine Assembly; Crankcase Preparation - Upper; Piston Ring Installation - Polaris Sportsman XP 1000 S 2020 Service Manual

ENGINE ASSEMBLY

CRANKCASE PREPARATION - UPPER

Refer to Oil Flow Diagram and trace the oil path through
the upper crankcase / cylinder. Flush all oil passages
with solvent and then warm soapy water. Rinse with
clear, warm water and dry with compressed air. Be sure
passages are clean and dry before assembling the upper
crankcase.

PISTON RING INSTALLATION

Apply clean engine oil to rings. Check ring installed gap
before installation. Clean accumulated carbon from ring
grooves and lubrication holes if piston has been in
service.
1. Place oil control ring expander in oil ring groove. Tips
of expander gap (A) must face piston crown so
scraper edge (B) of expander faces piston skirt.
2. Rotate expander in groove until butt ends are on
intake side of piston. Ends must butt squarely
together and must not overlap.
3. Install bottom rail first, then top rail with end gap
located as shown at right.
9931493 R03 - 2020-2021 Sportsman XP 1000 S Service Manual
© Copyright Polaris Inc.
ENGINE / COOLING SYSTEM
4. Install second ring with undercut facing bottom of
piston. Rotate ring to place end gap generally toward
(intake) side of piston as shown below.
5. Install top ring with "0" mark facing up (toward piston
crown) and rotate to position the gap generally at the
front as shown below.
6. Be sure top and second rings rotate freely in their
grooves and do not bind when compressed by hand.
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