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9850043 R01 - 2017-2021 RANGER 500 / 570 Service Manual
© Copyright Polaris Inc.
3.53
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.
NOTICE
The valves can be re-faced or end ground, if necessary.
They must be replaced if extensively worn, burnt, bent
or damaged.
6. Measure diameter of valve stem with a micrometer in
three places, then rotate 90° and measure again
(take six measurements total). Compare to
specifications.
MEASUREMENT
Valve Stem Diameter:
Intake: 0.2731" - 0.2737" (6.938 - 6.953mm)
Exhaust: 0.2724" - 0.2730" (6.918 - 6.933 mm)
7. Measure valve guide inside diameter at the top
middle and end of the guide using a small hole gauge
and a micrometer. Measure in two directions.
MEASUREMENT
Valve Guide I.D.:
0.2741" - 0.2747" (6.963 - 6.978 mm)
8. Be sure to measure each guide and valve
combination individually.
NOTICE
The valve guides cannot be replaced.
ENGINE / COOLING SYSTEM
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