One Way Valve - Polaris Sportsman 400 Service Manual

CAM CHAIN/TENSIONER BLADE, CONT.
4. Using the special socket, remove the crankshaft
slotted nut (A). NOTE: The slotted nut is a left hand
thread.
5. Remove cam chain drive sprocket (B) 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

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.
1. Remove cap bolt, sealing washer, spring, and one
way valve 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.
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ENGINE
B
A
3.47