3.31
ENGINE
3
9923412 - 2012 Sportsman 400/500 and EFI Tractor Service Manual
© Copyright 2011 Polaris Sales Inc.
Piston Removal
1. Remove circlip. Note piston directional arrow
pointing toward the right (Mag) side of engine.
2. Remove piston circlip and push piston pin out of
piston. If necessary, heat the crown of the piston
slightly with a propane torch. CAUTION: Do not apply
heat to the piston rings. The ring may lose radial
tension.
3. Remove top compression ring.
*Using a piston ring pliers: Carefully expand ring and
lift it off the piston. CAUTION: Do not expand the ring
more than the amount necessary to remove it from the
piston, or the ring may break.
*By hand: Placing both thumbs as shown, spread the ring
open and push up on the opposite side. Do not scratch the
ring lands.
4. Repeat procedure for second ring.
The oil control ring is a three piece design consisting
of a top and bottom steel rail and a center expander
section. The top rail has a locating tab on the end
which fits into a notch (A) in the upper oil ring land of
the piston.
5. Remove the top rail first followed by the bottom rail.
6. Remove the expander.
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