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9929422 R02 - 2017-2019 ACE 900 Service Manual
© Copyright Polaris Industries Inc.
10. Evenly loosen the four bolts retaining each rear
camshaft carrier
a
and carefully lift the carriers off
the camshafts.
11. Mark the intake
s
and exhaust
d
camshafts to
ensure proper assembly.
12. Carefully remove camshafts from the cylinder head.
CAMSHAFT SPROCKET INSPECTION
Inspect cam sprocket teeth for wear or damage
q
.
Replace timing chain and sprockets if worn or damaged.
CAMSHAFT / CAMSHAFT BORE
INSPECTION
Inspect all main journals and cam lobes as described
below and compare to specifications. Replace camshaft
(s) or cylinder head if worn beyond service limit or if any
surface is pitted or damaged.
1. Visually inspect each cam lobe for wear or damage.
2. Measure the height of each cam lobe from the base
circle to highest point on the lobe using a
micrometer. Compare to specification.
NOTICE
Replace camshafts if damaged or if any part is worn
past the service limit.
MEASUREMENT
Camshaft Lobe Height:
Intake: 1.5256 ± .0015" (38.75 ± .040 mm)
Service Limit: 1.5220" (38.66 mm)
Exhaust: 1.4961" ± .0015" (38.00 ± .040 mm)
Service Limit: 1.4925" (37.91 mm)
3. Visually inspect each camshaft journal for scoring,
wear or damage.
ENGINE / COOLING SYSTEM
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