One Way Valve; Crankcase Separation - Polaris Magnum 2x4 Service Manual

ENGINE
EH42PL/EH50PL Engine
Engine Disassembly, Cont.
4. Using the special socket, remove the crankshaft
slotted nut. NOTE: The 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
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.
3. Inspect valve for wear.
4. Check seat area for nicks or foreign material that may
prevent proper sealing of valve.
Cran kcase Separation
1. Remove flange bolts (10) from magneto side
crankcase evenly in a criss-cross pattern.
2. Install crankcase puller tool on magneto side
crankcase with hole positioned over balancer gear.
NOTE: The flywheel key must be removed before
puller is installed.
3. Separate crankcase by tightening puller bolt in small
steps and tapping on the pump shaft lightly with a
plastic hammer.
4. Tap lightly on balancer gear with a brass drift through
the hole in the puller if necessary to ensure the
balancer shaft stays in the PTO side crankcase.
5. Continue to tighten puller center bolt while tapping on
pump shaft and balancer shaft until cases are
separated.
7/96
3.68
Inspect for Areas of
Tooth Wear or Damage
Polaris Industries Inc.