Cylinder / Piston Installation - Polaris RANGER XP 900 2018-2019 Service Manual

CYLINDER / PISTON INSTALLATION

CAUTION
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).
New pistons are directional (intake vs. exhaust), but
can be placed in either cylinder.
1. Apply clean engine oil to each piston assembly,
cylinder bore and bottom tapered portion of each
cylinder sleeve.
2. Verify that all ring end gaps are correctly located on
each piston. Refer
Installation"page 3.66 procedure.
3. Note the piston orientation mark (arrow) located on
top of the piston. Arrow should point toward the
exhaust side.
NOTICE
Orientation arrow is also located on the bottom side of
piston as an additional reference.
9929399 R01 - 2018-2019 RANGER XP/ CREW 900/1000 Service Manual
© Copyright Polaris Industries Inc.
4. Carefully compress the piston rings with your fingers
to "Piston Ring
5. Rotate the engine so the crankcase to cylinder
6. Clean base gasket sealing surface on cylinder and
7. Reinstall dowel pins in crankcase if previously
8. Install a new cylinder base gasket.
9. Verify piston orientation (arrow pointing toward
10. Carefully place the cylinder and pistons into the
ENGINE / COOLING / HVAC SYSTEM
and install the piston / connecting rod assemblies
into the cylinder from the bottom side.
NOTICE
Use a slight front to back rocking motion until all rings
are captive in cylinder and past the cylinder sleeve
opening.
mounting surface is facing up.
crankcase to remove all oil and grease.
IMPORTANT
Base gasket and surfaces must be DRY and oil free.
Use care upon assembly to keep oil away.
removed.
exhaust) one last time prior to installation.
upper crankcase.
3
3.69