3.51
ENGINE / COOLING SYSTEM
3
9923523 - 2012
RANGER
RZR 570 Service Manual
© Copyright 2011 Polaris Sales Inc.
3. Measure connecting rod small end ID. Inspect bearing
surface for damage.
4. Measure piston ring to groove clearance by p lacing
the rin g in th e r ing la nd and mea suring with a
thickness gauge. Replace piston and rings if ring-to-
groove clearance exceeds service limits.
Piston Ring Installed Gap
1. Place each piston ring inside cylinder. Use a piston
to push the ring sq uarely into p lace 1” (2 5.4 mm)
down from the cylinder head gasket surface.
2. Measure installed gap with a feeler gauge at location
(A).
NOTE: Always check piston ring installed gap after
re-boring a cylinder or when installing new rings.
Piston Pin Degree of Fit
Pin should be a push-fit by hand with piston
at room temperature or warmed slightly
Connecting Rod Small End ID:
Standard:
0.8665” - 0.8670” (22.010 - 22.023 mm)
Piston Ring-to-Groove Clearance
Top Ring Standard:
0.0011” - 0.0037" (0.030 - 0.095 mm)
Service Limit:
0.0042" (0.108 mm)
Second Ring Standard:
0.0007” - 0.0029" (.020 - 0.076 mm)
Service Limit:
0.0035" (0.89 mm)
Piston
Ring
Feeler Gauge
Piston Ring Installed Gap
Top Ring
Std:
0.0059” -
0.0122" (0.15 - 0.31 mm)
Limit:
0.0137" (0.35 mm)
Second Ring
Std:
0.0094” - 0.0196" (0.24 - 0.50 mm)
Limit:
0.022" (0.56 mm)
Oil Ring Rails
Std:
0.0098” - 0.0401" (0.25 - 1.02 mm)
Limit:
0.0480" (1.22 mm)
Piston Ring
Cylinder Head
1”
A
Gasket Surface
Summary of Contents for 2012 RANGER RZR 570
Page 4: ......