3
9929422 R02 - 2017-2019 ACE 900 Service Manual
© Copyright Polaris Industries Inc.
3.89
VALVE CLEARANCE ADJUSTMENT
IMPORTANT
Do not rotate the engine backwards. The timing chain
may jump teeth and lead to poor performance.
NOTICE
Always inspect valve clearance prior to camshaft
installation or final engine assembly.
1. Reference the camshaft intake and exhaust
markings made during disassembly. If installing new
camshafts or if camshafts were not marked, you can
reference the part number stamped on the end of the
shafts.
Intake Camshaft
q
- PN 1204583
Exhaust Camshaft
w
- PN 1204584
2. Lubricate the camshaft bearing journal surfaces with
Polaris PS-4 engine oil prior to installation.
3. Carefully install the camshafts into the cylinder head.
The PTO camshaft lobes
e
should face out as
shown.
4. Carefully install the rear camshaft carriers onto the
camshafts. Carrier openings should face each other
when installed properly.
5. Install the four bolts that retain each rear camshaft
carrier
r
&
t
and tighten the bolts evenly to
specification.
TORQUE
Camshaft Carrier Bolts:
89 in-lbs (10 Nm)
ENGINE / COOLING SYSTEM
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