Valve Seat Reconditioning - Polaris RZR XP Turbo Service Manual

1. Clean all accumulated
q
combustion chambers and valve seat area
NOTE
Carbon Clean Fuel Treatment (2871326) can be used
to help remove carbon deposits.
Do not use a metal scraper, a coarse wire brush or
abrasive cleaners to clean the cylinder head. Damage
may result.
2. Visually inspect cylinder head gasket surface and
combustion chamber for cracks or damage. Pay
close attention to areas around spark plug and valve
seats.

VALVE SEAT RECONDITIONING

CAUTION
The EXHAUST valves are sodium filled and should be
handled with care.
Valve seat reconditioning should be performed by a
technician proficient in cylinder head reconditioning
techniques. Reconditioning techniques vary, so follow
the instructions provided by the valve reconditioning
equipment manufacturer. Do not grind seats more than
necessary to provide proper seat surface, width, and
contact point on valve face.
WARNING
Wear eye protection or a face shield during cylinder
head disassembly and reassembly.
Valve Seat Inspection
Inspect valve seat in cylinder head for pitting, burnt
spots, roughness, and uneven surface. If any of the
above conditions exist, the valve seat must be
reconditioned. If the valve seat is cracked the cylinder
head must be replaced.
9928491 R04 - 2017-2018 RZR XP Turbo / XP4 Turbo Service Manual
© Copyright Polaris Industries Inc.
carbon deposits from Valve seat width and point of contact on the valve face is
w
. very important for proper sealing. The valve must contact
the valve seat over the entire circumference of the seat,
and the seat must be the proper width all the way
around. If seat is uneven, compression leakage will
result. If seat is too wide, seat pressure is reduced,
causing carbon accumulation and possible compression
loss. If seat is too narrow, heat transfer from valve to seat
is reduced. The valve may overheat and warp, resulting
in burnt valves.
Renewing Valve Seats
1. Install pilot into valve guide.
2. Apply cutting oil to valve seat and cutter.
3. Place 46° cutter on the pilot and make a light cut.
4. Inspect the cut area of the seat:
• If the contact area is less than 75% of the
• If the cutter now contacts the uncut portion of the seat,
• If the contact area of the cutter is in the same place,
• If the contact area of the initial cut is greater than 75%,
ENGINE / COOLING SYSTEM
circumference of the seat, rotate the pilot 180° and
make another light cut.
check the pilot. Look for burrs, nicks, or runout. If the
pilot is bent it must be replaced.
the valve guide is distorted from improper installation.
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.
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