Valve Inspection; Combustion Chamber - Polaris Ranger 500 2x4 2007 Service Manual

5. Remove valve seals.
CAUTION: Replace seals whenever the cylinder head is
disassembled. Hardened, cracked or worn valve seals will
cause excessive oil consumption and carbon buildup.

Valve Inspection

1. Remove all carbon from valve with a soft wire wheel.
2. Check valve face for runout, pitting, and burnt spots. To
check for bent valve stems, mount valve in a drill or use "V"
blocks and a dial indicator.
3. Check end of valve stem for flaring, pitting, wear or damage
(A).
4. Inspect split keeper groove for wear or flaring of the keeper
seat area (B).
NOTE: The valves cannot be re-faced or end ground.
They must be replaced if worn, bent, or damaged.
5. Measure diameter of valve stem with a micrometer in three
places and in two different directions (six measurements
total). Compare to specifications.
Measure valve stem in
several places
Exhaust: .2341-.2346" (5.945-5.960 mm)
6. 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, front to back and side to side.
A
7. Subtract valve stem measurement to obtain stem to guide
clearance.
NOTE: Be sure to measure each guide and valve
combination individually.
8. Replace valve and/or guide if clearance is excessive.
Compare to specifications.
B
NOTE: If valve guides are replaced, valve seats must
be reconditioned.
Reconditioning procedure.

Combustion Chamber

Clean all accumulated carbon deposits from combustion
chamber and valve seat area with a soft wire brush.
Valve Stem Diameter:
Intake: .2343-.2348" (5.950-5.965 mm)
Valve Guide I.D.:
.2362 - .2367" (6.0 - 6.012 mm)
Refer to the Valve Seat
ENGINE
3
3.25