mxu 400 Manuel atelier : Page 45

                                                                      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.




                                                  CC131D
 3. Push the valve from side to side; then from top to
    bottom.
 4. Maximum "wobble" deflection must not exceed
    specifications.
                                                                                                               CC144D
Measuring Valve Guide                                        2. Insert each valve into its original valve location.
(Inside Diameter)

 1. Insert a snap gauge 1/2 way down into each valve
                                                             3. Install the valve springs with the painted end of the
                                                                spring facing away from the cylinder head.               3
    guide bore; then remove the gauge and measure it          NOTE: If the paint is not visible, install the ends
    with a micrometer.
                                                            of the springs with the closest wound coils toward
 2. Acceptable inside diameter range must be within         the head.
    specifications.
 3. If a valve guide is out of tolerance, the cylinder
    head must be replaced.
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
                                                                                                             ATV-1011A
If valves are discolored or pitted or if the seating
surface is worn, the valve must be replaced. Do not          4. Place a spring retainer over the valve springs; then
attempt to grind the valves or severe engine damage
                                                                using the valve spring compressor, compress the
                                                                valve springs and install the valve keepers.
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                                                            CC994
    of the rocker arm shaft.
 2. Acceptable outside diameter range must be within
    specifications.
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