Cylinder Head Inspection; Cylinder Head Warp Inspection; Valve Inspection - Polaris RANGER 500 2017 Service Manual

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ENGINE / COOLING SYSTEM

CYLINDER HEAD INSPECTION

Thoroughly clean cylinder head surface to remove all

traces of gasket material and carbon.

Use care not to damage gasket sealing surface. All

gasket surfaces must be clean, dry and free of any oil

or grease upon assembly. Clean sealing surfaces with

rubbing alcohol or electrical contact cleaner. Do not

touch sealing surfaces of the new head gasket.

1. Lay a straight edge

cylinder head at several different points and measure

warp by inserting a feeler gauge between the straight

edge and the cylinder head surface. If warp exceeds

the service limit, replace the cylinder head.

Cylinder Head Warp Limit:

.0024" (0.06 mm)

across the surface of the

1. Remove all carbon from valves with a soft wire wheel

2. Check valve face for excessive runout, pitting, and

burnt spots.

3. To check for bent valve stems, mount valve in "V"

blocks and measure with a dial indicator.

4. Check the end of the valve stem for flaring, pitting,

wear or damage.

5. Inspect split keeper groove for wear or flaring in the

keeper seat area.

The valves can be re-faced or end ground, if necessary.

They must be replaced if extensively worn, burnt, bent

9850043 R01 - 2017-2021 RANGER 500 / 570 Service Manual

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