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ENGINE
Crankcase Bearing Inspection
1. Remove the seal from the PTO side crankcase.
2. Inspect the crankshaft main bearings, balancer shaft
bearings, and pump shaft bearing.
NOTE: Due to extremely close tolerances and
minimal wear, the bearings must be inspected
visually, and by feel. Look for signs of discoloration,
scoring or galling. Turn the inner race of each
bearing.
The bearings should turn smoothly and
quietly. The outer race of each bearing should fit
tightly in the crankcase. The inner race should be
firm with minimal side to side movement and no
detectable up and down movement.
3. Support the crankcase and drive or press the main
bearings out of each crankcase.
4. To remove balancer shaft bearings and pump shaft
bearing use a blind hole bearing puller.
NOTE: Bearings are stressed during the removal
process and should not be re-used!
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9923412 - 2012 Sportsman 400/500 and EFI Tractor Service Manual
© Copyright 2011 Polaris Sales Inc.
Oil Seal / Mechanical Seal Removal
(Engine Disassembled)
NOTE: The water pump mechanical seal can be
removed without removing the engine.
Water Pump Mechanical Seal Installation.
Replace the pump shaft seal and water pump mechanical
seal whenever the crankcase is disassembled.
1. Remove the pump shaft bearing from the Magneto
(right hand) side crankcase.
2. Pry out the oil seal, noting the direction of installation
with the spring side facing IN (toward inside of case).
3. Drive the water pump mechanical seal out of the
crankcase from inside to outside. Note: The new
mechanical seal must be installed after the
crankcases are assembled, using a special tool. See
Mechanical Seal Installation.
Crankcase Inspection
1. Remove all traces of gasket sealer from the
crankcase mating surfaces.
closely for nicks, burrs or damage.
2. Check the oil pump and oil passage mating surfaces
to be sure they are clean and not damaged.
Refer to
Inspect the surfaces
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