Page 165 - Manual Oficina Polaris RS1 2018 e 2019

ENGINE / COOLING SYSTEM

CYLINDER / PISTON INSTALLATION 4. Carefully compress the piston rings with your fingers
and install the piston assemblies into the cylinder
CAUTION from the bottom side. Use piston ring compressor
pliers (PV-43570-1) to aid in assembly, if necessary.
Pistons must be installed into the cylinders with the
connecting rods attached.DO NOTattempt 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.
3

NOTE
If the pistons are being reused, reassemble in the same
cylinder bore and direction from which they were
removed (MAG / PTO).
New pistons are directional (intake vs. exhaust), but
can be placed in either cylinder.

NOTE
1. Apply clean engine oil to each piston assembly,
cylinder bore and bottom tapered portion of each Use a slight front to back rocking motion until all rings
cylinder sleeve. are captive in cylinder and past the cylinder sleeve
2. Verify that all ring end gaps are correctly located on opening q.
each piston (see Piston Ring Installation).
3. Note the piston orientation mark (arrow) located on 5. Rotate the engine so the crankcase to cylinder
top of the piston. Arrow should point toward the mounting surface is facing up.
exhaust side. 6. Clean base gasket sealing surface on cylinder and
crankcase to remove all oil and grease.
NOTE
Base gasket and surfaces must be DRY and oil free.
Use care upon assembly to keep oil away.

7. Reinstall dowel pins in crankcase if removed.
8. Install a new cylinder base gasket.
9. Verify piston orientation (arrow pointing toward
exhaust) one last time prior to installation.

NOTE
Orientation arrow is also located on the bottom side of
piston as an additional reference.

9928689 - 2018 RZR RS1 Service Manual 3.79
© Copyright Polaris Industries Inc.