3.64
9940259 R02 - 2022
RZR
PRO R / PRO R 4 Service Manual
© Copyright Polaris Industries Inc.
4. Remove four fasteners, breather assembly, and
gasket from the engine block.
5. Remove and discard the piston jet fasteners.
6. Remove the piston jet.
ENGINE BLOCK CLEANING AND
INSPECTION
1. Clean the sealing material from the gasket mating
surfaces
q
with a suitable tool.
2. Clean the engine block and lower crankcase in a
cleaning tank with solvent appropriate for aluminum.
3. Flush the engine block with clean water or steam.
4. Clean the oil passages.
5. Clean the blind holes.
6. Spray the cylinder bores and the machined surfaces
with engine oil.
7. Inspect the threaded holes. Clean the threaded holes
with a rifle brush. If necessary, drill out the holes and
install thread inserts.
NOTICE
Do not attempt to machine the lower crankcase to
engine block surfaces.
8. Use a straight edge and a feeler gauge to check the
deck surface for flatness. Carefully machine minor
irregularities. Replace the block if more than 0.010 in
(0.254 mm) must be removed.
9. Inspect the oil pan rail for nicks. Inspect the front
cover attaching area for nicks. Use a flat mill file to
remove any nicks.
10. Clean the sealing material from the gasket mating
surfaces on the lower crankcase engine block side
with a suitable tool.
11. Clean the sealing material from the gasket mating
surfaces on the lower crankcase oil pan side with a
suitable tool.
