Polaris RANGER 500 2017, Руководство по обслуживанию

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9850043 R01 - 2017-2021 RANGER 500 / 570 Service Manual
© Copyright Polaris Inc.
3.103
5. Record measurements taken in Step 4. If cylinder is
tapered, or out of round beyond .001, cylinder must
be re-bored oversize, or replaced.
Cylinder Taper Limit:
.001″ Max. (0.025 mm)
Cylinder Out of Round Limit:
.001″ Max. (.025 mm)
Standard Bore Size:
3.8976 +/- 0.0003″ (99.0 +/- 0.008 mm)
PISTON REMOVAL
1. Ensure the piston arrow points toward the exhaust
side of the 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.
IMPORTANT
Do not apply heat to the piston rings, they may lose
radial tension.
3. Remove top ring.
IMPORTANT
Using a piston ring pliers, carefully expand ring and lift it
off the piston. Do not expand the ring more than the
amount necessary to remove it from the piston.
By hand, use both of your thumbs to spread the ring
open and push up on the opposite side.
4. Repeat steps for the second ring.
5. Remove oil control ring top rail first, then remove the
bottom rail.
6. Remove the oil control ring expander.
PISTON-TO-CYLINDER CLEARANCE
1. Measure the outside diameter of the piston 12 mm
from the skirt and at a right angle to the direction of
the piston pin
q
.
2. Subtract this measurement from the maximum
cylinder size measurement from cylinder inspection.
Piston to Cylinder Clearance:
.00177 - .002925″ (.045 - .075 mm)
Piston O.D.:
3.8957 - 3.8968″ (98.953 - 98.980 mm)
ENGINE / COOLING SYSTEM