Page 141 - Manual Oficina Polaris RS1 2018 e 2019

ENGINE / COOLING SYSTEM

4. Inspect the cut area of the seat: 7. Remove valve and check where the Prussian Blue™
indicates seat contact on the valve face. The valve
* If the contact area is less than 75% of the seat should contact the middle of the valve face or
circumference of the seat, rotate the pilot 180° and slightly above, and must be the proper width.
make another light cut.
* If the indicated seat contact is at the top edge of the
* If the cutter now contacts the uncut portion of the valve face and contacts the margin area w it is too
seat, check the pilot. Look for burrs, nicks, or runout. high on the valve face. Use the 30° cutter to lower the
If the pilot is bent it must be replaced.
valve seat.
* If the contact area of the cutter is in the same place, * If too low, use the 60° cutter to raise the seat. When
the valve guide is distorted from improper installation.
contact area is centered on the valve face, measure
* If the contact area of the initial cut is greater than seat width. 3
75%, continue to cut the seat until all pits are * If the seat is too wide or uneven, use both top and
removed and a new seat surface is evident.
bottom cutters to narrow the seat.
NOTE
* If the seat is too narrow, widen using the 45° cutter
Remove only the amount of material necessary to and re-check contact point on the valve face and seat
repair the seat surface. width after each cut.
NOTE
5. To check contact area of the seat on the valve face,
apply a thin coating of Prussian Blue™ paste to the When using an interference angle, the seat contact
valve seat. If using an interference angle (46°) apply point on the valve will be very narrow, and is a normal
black permanent marker to the entire valve face q. condition. Look for an even and continuous contact
point all the way around the valve face e.

6. Insert valve into guide and tap valve lightly into place
a few times.

9928689 - 2018 RZR RS1 Service Manual 3.55
© Copyright Polaris Industries Inc.