3.84
9940259 R02 - 2022
RZR
PRO R / PRO R 4 Service Manual
© Copyright Polaris Industries Inc.
ENGINE ASSEMBLY - TOP END
CYLINDER HEAD ASSEMBLY
NOTICE
In order to avoid damage, install the spark plugs after
the cylinder head has been installed on the engine.
1. Inspect the valve springs for the following conditions:
• Expanded height
• Unparallel spring ends
• Spring tension using tester
• Any distorted springs should be replaced
2. Install the intake
y
and exhaust
u
valves .
3. use the following steps to measure valve runout:
a. Apply a dab of Prussian blue on the entire valve
face. Seat the valve but do not rotate it. The
Prussian blue traces transferred to the valve seat
are an indication of concentricity of the valve seat.
b. Clean all traces of Prussian blue.
c. Apply a dab of Prussian blue on the valve seat
and repeat the check. The traces of Prussian blue
transferred to the valve face indicates valve face
concentricity.
4. Replace any valves, if required.
5. Install the new valve seals
t
. Fully seat the seals on
the valve guides.
6. Install the springs
r
.
7. Install the retainers
e
.
8. Using the
PU-51126
compressor, compress the valve
spring.
9. Install the valve keys
w
.
10. Slowly release the
PU-51126
compressor from the
valve/spring assembly
