Exhaust Camshaft Decompression Mechanism; Cam Chain And Guide Service - Polaris RANGER 500 2018 Service Manual

2. Measure the height of each cam lobe from the base
circle to highest point on the lobe using a micrometer.
Compare to specification.
NOTE
Replace camshaft if damaged or if any part is worn past
the service limit.
MEASUREMENT
Camshaft Lobe Height:
Intake: 2.0327" ± 0.0038" (51.63 ± 0.097 mm)
Exhaust: 2.0657" ± 0.0038" (52.47 ± 0.097 mm)
EXHAUST CAMSHAFT DECOMPRESSION
MECHANISM
NOTE
Removal of the decompression mechanism is not
necessary unless replacement is required.
1. Thoroughly clean and inspect the decompression
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mechanism located on the exhaust camshaft.
9928485 R01 - 2017-2018 RANGER 500 / 570 Service Manual
© Copyright Polaris Industries Inc.
ENGINE / COOLING SYSTEM
2. Replace the decompression
excessive wear or binding is evident.
3. Be sure the decompression mechanism functions
smoothly and easily returns under spring pressure to
the resting position against gravity.
NOTE
If the ball or bushing are damaged the whole camshaft
needs to be replaced. If there is damage to the weight,
spring, or shaft, the service kit 2206632 can be ordered
to replace the assembly.

CAM CHAIN AND GUIDE SERVICE

NOTE
The crankcase has a removable lower cam chain drive
guide that prevents the chain from disengaging the
crankshaft during engine service.
The cam chain, cam chain guides and cam chain
tensioner can be replaced with the engine installed in
the vehicle.
1. If not already performed, remove the valve cover,
stator cover, flywheel, cam chain tensioner, cam
carrier and camshafts as outlined in this chapter.
2. Remove the two fasteners
w
cam chain guides to the crankcase.
e
3. Remove the fasteners
r
chain guide to the crankcase.
4. Inspect the cam chain guides and replace if
excessive wear is evident.
assembly if any
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that secure the upper
that secure the lower cam
3.67
3