Page 172 - Manual Oficina Polaris Sportsman 570 2014 a 2016

ENGINE / COOLING SYSTEM

VALVE INSPECTION 6. Measure diameter of valve stem with a micrometer in
three places, then rotate 90° and measure again
1. Remove all carbon from valves with a soft wire wheel
or brush. (take six measurements total). Compare to
specifications.
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.

MEASUREMENT
Intake Valve Stem Diameter:
.1958–.196 in. / 4.975-4.990 mm
Exhaust Valve Stem Diameter:
.1950–.1956 / 4.955-4.970 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.
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. MEASUREMENT
NOTE Valve Guide I.D.:
.1968 – .197 in. / 5.00 - 5.015 mm
The valves can be re-faced or end ground, if necessary.
They must be replaced if extensively worn, burnt, bent 8. Be sure to measure each guide and valve
or damaged.
combination individually.
NOTE
The valve guides cannot be replaced.

3.50 9926803 R06 - 2014-2016 Sportsman 325 / ETX / 450 HO / 570 Service Manual
© Copyright Polaris Industries Inc.