Page 274 - Manual Oficina Polaris Sportsman 570 2014 a 2016

ENGINE / COOLING SYSTEM

5. Record measurements taken in Step 4. If cylinder is 6. Remove oil control ring expander.
tapered, or out of round beyond .001, cylinder must
be re-bored oversize, or replaced.

Cylinder Taper Limit: PISTON-TO-CYLINDER CLEARANCE
.001″ Max. (0.025 mm) 1. Measure the outside diameter of the piston 12 mm
Cylinder Out of Round Limit: from the skirt and at a right angle to the direction of
.001″ Max. (.025 mm) the piston pin q.

Standard Bore Size:
3.8976 +/- 0.0003″ (99.0 +/- 0.008 mm)

PISTON REMOVAL
1. Note piston directional indicator “EX” positioned
toward the exhaust 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 heat gun.

2. Subtract this measurement from the maximum
CAUTION
cylinder size measurement from cylinder inspection.
Do not apply heat to the piston rings, they may lose
radial tension. Piston to Cylinder Clearance:
.00177 - .002925″ (.045 - .075 mm)
3. Remove top ring. Piston O.D.:
*Using a piston ring pliers: Carefully expand ring 3.8957 - 3.8968″ (98.953 - 98.980 mm)
and lift it off the piston.

CAUTION
Do not expand the ring more than the amount
necessary to remove it from the piston.

*By hand: Using both thumbs, spread the ring open
and push up on the opposite side.

4. Repeat procedure for second ring.
5. Remove oil control ring top rail first, then bottom rail.

3.152 9926803 R06 - 2014-2016 Sportsman 325 / ETX / 450 HO / 570 Service Manual
© Copyright Polaris Industries Inc.