9940259 R02 - 2022
RZR
PRO R / PRO R 4 Service Manual
© Copyright Polaris Industries Inc.
3.49
CYLINDER HEAD AND GASKET
SURFACE CLEANING AND INSPECTION
1. Remove the spark plugs and coolant vent line fitting.
2. Inspect the cylinder head gasket and mating surfaces
for leaks, corrosion and blow-by. If the gasket has
failed, use the following faults to determine the cause:
a. Improper installation
b. Loose or warped cylinder head
c. Missing, off location or not fully seated dowel pins
d. Corrosion in the seal area around the coolant
passages
e. Chips or debris in the cylinder head bolt holes
f.
Bolt holes in the cylinder block not drilled or
tapped deep enough
IMPORTANT
Do not use a wire brush on any part of the valve stem.
Do not grind or condition the intake valve.
3. Inspect the cylinder head gasket surface.
• Cylinder head may be reused if corrosion is found
only outside a 4 mm (0.375 in) band around each
combustion chamber
q
.
• Replace the cylinder head if the area between the
valve seats is cracked
w
.
• Replace the cylinder head if corrosion has been
found inside a 4 mm (0.375 in) band around each
combustion chamber
e
.
