Page 226 - Manual_Polaris_RZR_ProXP-20-21

ENGINE / COOLING SYSTEM

PISTON / CYLINDER INSTALLATION 2. Verify that all ring end gaps are correctly located on
each piston (see Piston Ring Installation page 3.80).
CAUTION
3. Carefully compress the piston rings with your fingers
Pistons must be installed into the cylinders with the and install the piston / connecting rod assemblies into
connecting rods attached. the cylinder from the top side.
DO NOTattempt to service the cylinder or pistons
without disassembling the crankcase. Although you can NOTICE
remove the cylinder and pistons without disassembly, Use a slight front to back rocking motion until all rings
you will not be able to reassemble the engine because are captive in cylinder.
of the unique cylinder skirt and crankcase design.
4. Rotate the engine so the crankcase to cylinder
IMPORTANT mounting surface is facing up.
If the pistons are being reused, reassemble in the same 5. Clean base gasket sealing surface on cylinder and
cylinder bore and direction from which they were crankcase to remove all oil and grease.
removed (MAG / PTO).
NOTICE
Base gasket and surfaces must be DRY and oil free.
CAUTION
Use care upon assembly to keep oil away.
The pistons ARE directional. The relief pockets in the
pistons must face the intake side and the arrow points 6. Reinstall dowel pins in crankcase if previously
towards the exhaust side.
removed.
7. Install a new cylinder base gasket.
8. Carefully place the cylinder and pistons into the upper
crankcase.

1. Apply clean engine oil to each piston assembly q
and cylinder bore prior to installation.

3.82 9930583 R01 - 2020-2021 RZR PRO XP / XP 4 Service Manual
© Copyright Polaris Industries Inc.