Measuring Valve Face/Seat Width; Measuring Valve Face Radial Runout; Measuring Valve Guide; Servicing Valves/Valve Guides/Valve Seats - Arctic Cat 450 Service Manual

Measuring Valve Face/Seat Width

1. Using a calipers, measure the width of the valve
face.
2. Acceptable width must be at or above specifica-
tions.
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 out-
side edge of the valve face; then zero the indicator.
3. Rotate the valve in the V blocks.
4. Maximum runout 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, the cylinder
head must be replaced.
FI367
ATV1082A
Manual
Table of Contents
Servicing Valves/Valve
Guides/Valve Seats
If valves, valve guides, or valve seats require servicing
or replacement, Arctic Cat recommends that the com-
ponents be taken to a qualified machine shop for ser-
vicing.
CAUTION
If valves are discolored or pitted or if the seating sur-
face is worn, the valve must be replaced. Do not attempt
to grind the valves or severe engine damage may occur.
Measuring Rocker Arm
(Inside Diameter)
1. Using a dial calipers, measure the inside diameter
of the rocker arm.
2. Acceptable inside diameter range must be within
specifications.
Measuring Rocker Arm Shaft
(Outside Diameter)
1. Using a micrometer, measure the outside diameter
of the rocker arm shaft.
2. Acceptable outside diameter range must be within
specifications.
Installing Valves
1. Apply grease to the inside surface of the valve
seals; then place a lower spring seat and valve
guide seal over each valve guide.
2. Insert each valve into its original valve location.
3. Install the valve springs with the painted end of the
spring facing away from the cylinder head.
NOTE: If the paint is not visible, install the ends
of the springs with the closest wound coils toward
the head.
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