Polaris R09VA17AA, Service Manual

Page: 59 / 187

3.15
ENGINE
3
7. Measure I.D. of each rocker arm for out-of-round and
visually inspect the I.D. surface. Replace arm if excessive
wear is evident.
8. Inspect the lash adjusters for wear, pitting, or damage to
threads of the adjuster or locknut. Replace all worn or
damaged parts.
NOTE: The end of the lash adjuster is
hardened and cannot be ground or re-surfaced.
Camshaft Removal
NOTE: Cam chain tensioner must be removed
before performing this procedure.
1. Verify the valve cover and cam chain tensioner have been
removed.
2. Remove the 4 cylinder head bolts evenly by loosening each
one 1/4 turn at a time until loose. Tap the rocker assembly
with a non-marring hammer to loosen and remove the
assembly.
3. Remove the cam chain from the sprocket by tilting the cam
assembly and simultaneously lifting the chain.
4. If not removing the cylinder for other service, secure the
cam chain with a wire to prevent it from falling into the
crankcase.
Camshaft Inspection
1. Inspect cam sprocket teeth for wear or damage. Replace if
necessary.
2. Inspect the compression release mechanism. This is a one-
way rotating shoulder that lifts the exhaust valve slightly
during start-up. If the one-way mechanism is not
functioning, replace the cam. Verify the stop bracket and
spring is functioning correctly. Replace if excessive wear
of components is found.
Inspect for Areas of
Tooth Wear or Damage
Compression Release
One-Way Operation
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