Page 145 - Manual Oficina Polaris RZR 570 13-18

ENGINE / COOLING SYSTEM

7. Remove valve and check where the Prussian Blue Intake Seat Cutter Diameter:
indicates seat contact on the valve face. The valve 1.567 in. (39.80 mm)
seat should contact the middle of the valve face or
slightly above, and must be the proper width.
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).
3

MEASUREMENT

Valve Seat Width:

Intake:
Std.: .0393" (1.00 mm)
Service Limit: .0551" (1.4 mm)

Exhaust:
Std.: .0590” (1.50 mm)
Service Limit: .0758" (1.9 mm)
Valve Seat Angles
1 - 30°
• If the indicated seat contact is at the top edge of the 2 - 45°
valve face and contacts the margin area (B) it is too 3 - 60°
high on the valve face. Use the 30° cutter to lower the
valve seat. Exhaust Seat Cutter Diameter:
• If too low, use the 70° cutter to raise the seat. When 1.364 in. (34.65 mm)
contact area is centered on the valve face, measure 8. Clean all filings from the area with hot soapy water.
seat width. Rinse and dry with compressed air.
• If the seat is too wide or uneven, use both top and
bottom cutters to narrow the seat. 9. Lubricate valve guides with clean engine oil and
• If the seat is too narrow, widen using the 45° cutter and apply oil or water based lapping compound to the
re-check contact point on the valve face and seat width face of the valve.
after each cut.
NOTE
Lapping is not required if an interference angle
reconditioning method is used.
10. Insert the valve into its respective guide and lap
using a lapping tool or a section of fuel line
connected to the valve stem.

9926813 R06 - 2013-2016 RZR 570 Service Manual 3.47
© Copyright Polaris Industries Inc.