3.50
9940259 R02 - 2022
RZR
PRO R / PRO R 4 Service Manual
© Copyright Polaris Industries Inc.
VALVE INSPECTION
NOTICE
Valve service specifications can be found at the
beginning of this chapter. See
1. Remove valves from the cylinder head.
2. Place valves on V-blocks as shown and measure
valve stem runout
q
using a runout gauge or similar
tool.
3. Inspect the valve face for damage from burning,
pitting or uneven contact.
NOTICE
Pitting is common on exhaust valve seats with these
materials and is not a cause for rejection.
4. Place valves on V-block as shown and inspect valve
head radial runout
w
.
5. Insert valves into their original locations in cylinder
head.
6. Inspect that each valve moves up and down smoothly
without binding in guide.
7. Measure valve stem deflection
e
for all valves to
determine if valve or valve guide requires
replacement.
• Raise valve 10mm (0.400") off of seat.
• Position dial indicator as shown. Measure
deflection in two directions perpendicular to each
other (X & Y axis).
8. Replace valve and repeat step 6 if valve stem O.D.
measures outside standard range. If valve stem
deflection exceeds service limits with a new valve
installed, valve guide must be replaced.
9. Installation of new valve guides and/or new valves
requires valve seat reconditioning. This work should
be performed by an experienced technician properly
equipped to perform cylinder head reconditioning.
