Page 148 - Manual Oficina Polaris RZR XP 1000 17-18

ENGINE / COOLING SYSTEM

VALVE SEALING TEST VALVE SEAT RECONDITIONING (1000)
1. Clean and dry the combustion chamber area q. Valve seat reconditioning should be performed by a
technician proficient in cylinder head reconditioning
2. Pour a small amount of clean solvent into each techniques. Reconditioning techniques vary, so follow
intake port w and check for leakage around the the instructions provided by the valve reconditioning
valves. The valve seats should hold fluid with no equipment manufacturer. Do not grind seats more than
seepage.
necessary to provide proper seat surface, width, and
contact point on valve face.

CAUTION
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.
Valve seat width and point of contact on the valve face is
very important for proper sealing. The valve must contact
3. Repeat for exhaust valves by pouring fluid into each the valve seat over the entire circumference of the seat,
exhaust port e. 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.

3.40 9928492 R06 - 2017-2018 RZR XP 1000 / XP4 1000 Service Manual
© Copyright Polaris Industries Inc.