3.62
9929422 R02 - 2017-2019 ACE 900 Service Manual
© Copyright Polaris Industries Inc.
5. Remove and discard the plain bearings located in
the upper crankcase
w
, lower crankcase
e
and
connecting rods
r
. Replace the crankcase
assembly if a bearing bore is galled or if bearing
inserts have rotated in the case. Refer to bearing
selection procedures upon assembly.
NOTICE
Always replace plain bearings when the crankcase or
connecting rods have been disassembled. Refer to
Crankshaft Main Bearing Selection page 3.69.
CYLINDER / PISTON REMOVAL
CAUTION
Pistons must be removed from 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.
1. Perform “ENGINE DISASSEMBLY / INSPECTION -
TOP END” and the “ENGINE DISASSEMBLY /
INSPECTION - LOWER END” procedures.
2. Rotate the engine so the cylinder is facing up.
3. Remove the Cylinder Holding & Camshaft Timing
Plate (PU-50563) from the cylinder.
4. Carefully lift the cylinder and pistons from the upper
crankcase.
5. Remove the piston / connecting rod assemblies from
the cylinder.
NOTICE
If the pistons are to be reused, mark the pistons so they
are reassembled in the same cylinder bore and
direction from which they were removed (MAG / PTO).
ENGINE / COOLING SYSTEM
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