Piston-To-Cylinder Clearance; Piston Ring Installed Gap - Polaris RZR PRO R Service Manual

ENGINE / COOLING SYSTEM

PISTON-TO-CYLINDER CLEARANCE

Measure piston outside diameter at a point 13 mm
from the bottom of the piston, at a right angle to piston
pin bore.
Subtract measurement from maximum measurement
obtained in Step 4 of "Cylinder Inspection" procedure.
MEASUREMENT
Piston O.D. (Standard):
3.66 ± 0.0005" (92.970 ± 0.015 mm)
Cylinder to Piston Clearance:
0.0017 - 0.0029 (0.045 - 0.075 mm)
3.58

PISTON RING INSTALLED GAP

q
up
1. Place each piston ring
the piston to push the ring squarely into cylinder, as
shown below.
2. Measure installed gap with a feeler gauge
the top and bottom of the cylinder.
A difference between top and bottom end gap
measurements is a general indication of cylinder taper
(wear). The cylinder should be measured for taper and
2
3. If the installed gap measurement exceeds the service
limit, replace the rings.
Top Ring: 0.0177 - 0.0236" (0.45 - 0.60 mm)
Service Limit: 0.0275 in (0.7 mm)
Second Ring: 0.0275 0.0374" (0.70 - 0.95 mm)
Service Limit: 0.0401 in (1.02 mm)
Oil Control Rails: 0.0009 - 0.0401" (0.025 - 1.02 mm)
Service Limit: 0.0452 in (1.15 mm)
Always check piston ring installed gap when installing
new rings and/or a new cylinder.
9940259 R02 - 2022 RZR PRO R / PRO R 4 Service Manual
q
inside the cylinder
NOTICE
out of round.
3
1
MEASUREMENT
Piston Ring Installed Gap:
NOTICE
© Copyright Polaris Industries Inc.
w
. Use
e
at both
0.59 in.
(15mm)