Piston / Cylinder Installation - Polaris RZR PRO XP 2020 Service Manual

ENGINE / COOLING SYSTEM

PISTON / CYLINDER INSTALLATION

Pistons must be installed into the cylinders with the
connecting rods attached.
DO NOT attempt to service the cylinder or pistons
without disassembling the crankcase. Although you can
remove the cylinder and pistons without disassembly,
you will not be able to reassemble the engine because
of the unique cylinder skirt and crankcase design.
IMPORTANT
If the pistons are being reused, reassemble in the same
cylinder bore and direction from which they were
removed (MAG / PTO).
The pistons ARE directional. The relief pockets in the
pistons must face the intake side and the arrow points
towards the exhaust side.
1. Apply clean engine oil to each piston assembly
and cylinder bore prior to installation.
3.82
CAUTION
CAUTION
2. Verify that all ring end gaps are correctly located on
each piston (see Piston Ring Installation page 3.80).
3. Carefully compress the piston rings with your fingers
and install the piston / connecting rod assemblies into
the cylinder from the top side.
Use a slight front to back rocking motion until all rings
4. Rotate the engine so the crankcase to cylinder
mounting surface is facing up.
5. Clean base gasket sealing surface on cylinder and
crankcase to remove all oil and grease.
Base gasket and surfaces must be DRY and oil free.
Use care upon assembly to keep oil away.
6. Reinstall dowel pins in crankcase if previously
removed.
7. Install a new cylinder base gasket.
8. Carefully place the cylinder and pistons into the upper
crankcase.
q
9850068 R01 - 2020-2021 RZR PRO XP / XP 4 Service Manual
NOTICE
are captive in cylinder.
NOTICE
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