3-22
Measuring Valve Stem
Outside Diameter
1. Using a micrometer, measure the valve stem
outside diameter.
2. Acceptable diameter range (intake valve) must
be within specifications.
3. Acceptable diameter range (exhaust valve) must
be within specifications.
Measuring Valve Face/Seat Width
1. Using a micrometer, measure the width of the
valve face.
ATV-1004
2. Acceptable width range must be within specifi-
cations.
Measuring Valve Face Radial
Runout
1. Mount a dial indicator on the surface plate; then
place the valve stem on a set of V blocks.
2. Position the dial indicator contact point on the
outside edge of the valve face; then zero the
indicator.
ATV1082A
3. Rotate the valve in the V blocks.
4. Maximum runout must not exceed specifications.
Measuring Valve Guide/Valve Stem
Deflection (Wobble Method)
1. Mount a dial indicator and base on the surface
plate; then place the cylinder head on the surface
plate.
2. Install the valve into the cylinder head; then posi-
tion the dial indicator contact point against the
outside edge of the valve face. Zero the indicator.
CC131D
3. Push the valve from side to side; then from top
to bottom.
4. Maximum “wobble” deflection must not exceed
specifications.
Measuring Valve Guide
(Inside Diameter)
1. Insert a snap gauge 1/2 way down into each
valve guide bore; then remove the gauge and
measure it with a micrometer.
2. Acceptable inside diameter range must be
within specifications.
3. If a valve guide is out of tolerance, it must be
replaced.
Servicing Valves/Valve
Guides/Valve Seats
If valves, valve guides, or valve seats require servic-
ing or replacement, Arctic Cat recommends that the
components be taken to a qualified machine shop
for servicing.
! CAUTION
If valves are discolored or pitted or if the seating
surface is worn, the valve must be replaced. Do not
attempt to grind the valves or severe engine damage
may occur.
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