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3.30
ENGINE
9923142 - 2011 RANGER RZR / RZR S / RZR 4 Service Manual
© Copyright 2010 Polaris Sales Inc.
4. Inspect the cut area of the seat:
* 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.
* 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.
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 permanent
marker to the entire valve face (A).
6. Insert valve into guide and tap valve lightly into place a few
times.
7. Remove valve and check where the Prussian Blue
indicates seat contact on the valve face. The valve seat
should contact the middle of the valve face or slightly
above, and must be the proper width.
* If the indicated seat contact is at the top edge of the valve face
and contacts the margin area (B) it is too high on the valve face.
Use the 30
cutter to lower the valve seat.
* If too low, use the 60
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 face and seat width after each
cut.
NOTE: When using an interference angle, the seat
contact point on the valve will be very narrow, and is
a normal condition. Look for an even and continuous
contact point all the way around the valve face (A).
8. Clean all filings from the area with hot soapy water. Rinse
and dry with compressed air.
A
= In. / mm.
Valve Seat Width:
Intake Std: .028" (.7 mm)
Limit: .055" (1.4 mm)
Exhaust Std: .039” (1.0 mm)
Limit: .071" (1.8 mm)
B
A
Proper Seat Contact
on Valve Face
Bottom 60
Seat 45
Top 30
Seat
Width