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9940259 R02 - 2022 RZR PRO R / PRO R 4 Service Manual

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

• Replace the cylinder head if the area between the

valve seats is cracked

• Replace the cylinder head if corrosion has been

found inside a 4 mm (0.375 in) band around each

combustion chamber

ENGINE / COOLING SYSTEM

Polaris RZR PRO R 4 User Manual

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