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3.20

ENGINE

9923412 - 2012 Sportsman 400/500 and EFI Tractor Service Manual

6. Subtract rocker shaft O.D. from rocker arm & shaft

support I.D. This is the oil clearance. Compare to

specifications.

7. Inspect rocker adjuster screws for wear, pitting, or

damage to threads of the adjuster or locknut. Replace

all worn or damaged parts.

NOTE: The end of the adjuster screw is hardened

and cannot be ground or re-faced.

Camshaft Removal

1. Remove thermostat housing.

2. Remove camshaft sprocket inspection cover.

3. Loosen three camshaft sprocket bolts.

4. Remove camshaft end cap and O-ring.

5. Inspect camshaft end cap (thrust face) for wear.

Replace if worn or damaged.

6. Place a clean shop towel in the area below cam chain

sprocket and remove sprocket retaining bolts.

7. Slide camshaft inward to allow removal of cam

sprocket and remove sprocket from camshaft and

chain.

8. Secure cam chain with a wire to prevent it from falling

into the crankcase.

9. Inspect cam sprocket teeth for wear or damage.

Replace if necessary.

Rocker Shaft Oil Clearance:

Std: .0008 - .0021” (.020 - .054 mm)

Limit: .0039” (.10 mm)

Sprocket teeth

Inspect for Areas of Tooth

Wear or Damage

Polaris A12MH46AX User Manual

Questions and Answers: