Cam Chain/Tensioner Blade; One Way Valve Removal - Polaris 2007 Sportsman 500 EF Service Manual

ENGINE
7. Remove large sealing O-Ring from outer edge of stator
plate.

Cam Chain/Tensioner Blade

1. Remove bolt securing tensioner blade to crankcase (A).
A
2. Remove blade and inspect for cracks, wear, or damage.
B
20 Pitch Section
3. Remove cam chain (B). Inspect chain for worn or missing
rollers or damage. Stretch chain tight on a flat surface and
apply a 10 lb. (4.53 kg) load. Measure length of a 20 pitch
3.32
section of chain. Replace if worn past service limit.
Chain Service Limit: 5.407" (13.7 cm)
4. Using the special socket, remove the crankshaft slotted nut.
NOTE: The crankshaft slotted nut is a left-hand thread.
5. Remove cam chain drive sprocket and woodruff key from
crankshaft.
6. Inspect sprocket teeth for wear or damage.
7. Inspect woodruff key for wear.
8. Replace any worn or damaged parts.

One Way Valve Removal

The one way valve prevents oil from draining out of the oil
tank and into the crankcase when the engine is off. It must
be clean and have adequate spring pressure in order to
seal properly.
D
C
1. Remove cap bolt (A), sealing washer (B), spring (C), and
one way valve (D) from PTO side crankcase.
2. Inspect free length of spring and check coils for distortion.
One Way Valve Spring Free Length:
Std: 1.450" (3.68 cm)
3. Inspect valve for wear.
4. Check seat area for nicks or foreign material that may
prevent proper sealing of valve.
A
B