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9850043 R01 - 2017-2021 RANGER 500 / 570 Service Manual
© Copyright Polaris Inc.
3.57
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:
.00138 - .00256″ (.035 - .065 mm)
Piston O.D.:
3.6592 - 3.6598″ (92.943 - 92.957 mm)
PISTON / ROD INSPECTION
1. Measure piston pin bore inside diameter I.D.
Piston Pin Bore:
Std.: 0.8662 - 0.8665″ (22.004 - 22.010 mm)
Service Limit: 0.8651″ (21.975 mm)
2. Measure piston pin O.D. Replace piston and/or piston
pin if out of tolerance.
Piston Pin O.D.:
Std.: 0.8659 - 0.8661″ (21.995 - 22.0 mm)
Service Limit: 0.8651″ (21.975 mm)
ENGINE / COOLING SYSTEM
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