3
9926806 R03 - 2015 - 2016 RANGER ETX / 570 2-SEAT 2015 - 2016 RANGER 570 CREW Service Manual
© Copyright Polaris Industries Inc.
3.51
CYLINDER HEAD WARP INSPECTION
1. Lay a straight edge
q
across the surface of the
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.
MEASUREMENT
Cylinder Head Warp Limit:
.0039" (0.1 mm)
VALVE INSPECTION
1. Remove all carbon from valves with a soft wire wheel
or brush.
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.
NOTE
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
Intake Valve Stem Diameter:
.1958–.196 in. / 4.975-4.990 mm
Exhaust Valve Stem Diameter:
.1950–.1956 / 4.955-4.970 mm
ENGINE / COOLING SYSTEM
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