Page 269 - Manual Oficina Polaris Sportsman 570 2014 a 2016

ENGINE / COOLING SYSTEM

CYLINDER HEAD INSPECTION VALVE INSPECTION
Thoroughly clean cylinder head surface to remove all 1. Remove all carbon from valves with a soft wire wheel
traces of gasket material and carbon. or brush.
2. Check valve face for excessive runout, pitting, and
CAUTION
burnt spots.
Use care not to damage gasket sealing surface. All
gasket surfaces must be clean, dry and free of any oil 3. To check for bent valve stems, mount valve in “V”
or grease upon assembly. Clean sealing surfaces with blocks and measure with a dial indicator.
rubbing alcohol or electrical contact cleaner. Do not
touch sealing surfaces of the new head gasket.
3

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.

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

MEASUREMENT
Cylinder Head Warp Limit:
.0024" (0.06 mm)

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.

9926803 R06 - 2014-2016 Sportsman 325 / ETX / 450 HO / 570 Service Manual 3.147
© Copyright Polaris Industries Inc.