Table of Contents
ENGINE / COOLING SYSTEM
• If the contact area is less than 75% of the
circumference of the seat, rotate the pilot 180°
and make another light cut.
• If the cutter now contacts the uncut portion of the
seat, check the pilot. Look for burrs, nicks, or
runout. If the pilot is bent it must be replaced.
• If the contact area of the cutter is in the same
place, the valve guide is distorted from improper
installation and must be replaced. Be sure the
cylinder head is at the proper temperature and
replace the guide.
• If the contact area of the initial cut is greater than
75%, continue to cut the seat until all pits are
removed and a new seat surface is evident.
NOTE: Remove only the amount of material
necessary to repair the seat surface.
NOTICE
Remove only the amount of material necessary to
repair the seat surface.
5. To check the contact area of the seat on the valve
face, apply a thin coating of Prussian Blue™ paste to
the valve seat. If using an interference angle (46°)
apply black marker to the entire valve face
6. Insert valve into guide and tap valve lightly into place
a few times.
7. Remove valve and check where the Prussian Blue™
or black marker indicates seat contact on the valve
face. The valve seat should contact the middle of the
3.52
valve face or slightly above, and must be the proper
q
width
• If the indicated seat contact is at the top edge of
the valve face and contacts the margin area
is too high on the valve face. Use the 30° cutter
to lower the valve seat.
• If too low use the 60° or 75° cutter to raise the
seat. When contact area is centered on the valve
face, measure seat width.
• If the seat is too wide or uneven, use both top
and bottom cutters to narrow the seat.
• If the seat is too narrow, widen using the 45°
cutter and re-check contact point on the valve
q
.
face and seat width after each cut.
9940259 R02 - 2022 RZR PRO R / PRO R 4 Service Manual
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ITEM
y
u
i
© Copyright Polaris Industries Inc.
w
it
ANGLE
30º
45º or 46º
60º or 75º
Chapters
Table of Contents
Troubleshooting
