Page 176 - Manual Oficina Polaris Sportsman 570 2014 a 2016

ENGINE / COOLING SYSTEM

CYLINDER REMOVAL 4. Inspect cylinder for taper and out of round with a
telescoping gauge or a dial bore gauge. Measure in
1. Remove and discard the head gasket q.
two different directions, front to back and side to
2. Position the cam chain and guides vertically. side, on three different levels (1/2" down from top, in
the middle, and 1/2” up from bottom).
3. Tap cylinder w lightly with a plastic hammer in the
reinforced areas only until loose.
4. Rock cylinder forward and backward and lift it from
the crankcase, supporting piston r and connecting
rod.
5. Remove the cylinder from the engine.

5. Record measurements taken in Step 4. If cylinder is
tapered, or out of round beyond .001, cylinder must
6. Remove and discard cylinder base gasket e. be re-bored oversize, or replaced.
Cylinder Taper
CYLINDER INSPECTION .00078 in. / 0.020 mm
1. Remove all gasket material from the cylinder sealing Cylinder Out of Round
surfaces.
.00078 in. / 0.020 mm
2. Inspect the top of the cylinder for warpage using a
straight edge and feeler gauge.
Standard Bore Size:
3.07 +/- 0.0003″ (78.0 +/- 0.008 mm)

PISTON REMOVAL
1. Note piston directional indicator “∆” positioned
toward the magneto 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.
CAUTION
Do not apply heat to the piston rings, they may lose
radial tension.
Cylinder Warpage:
.002 in. / 0.05 mm 3. Remove top ring.
*Using a piston ring pliers: Carefully expand ring
3. Inspect cylinder for wear, scratches, or damage. and lift it off the piston.

3.54 9926803 R06 - 2014-2016 Sportsman 325 / ETX / 450 HO / 570 Service Manual
© Copyright Polaris Industries Inc.