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ENGINE
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9923412 - 2012 Sportsman 400/500 and EFI Tractor Service Manual
© Copyright 2011 Polaris Sales Inc.
5. Inspect mating surface of crankcase and oil pump.
Check for nicks, burrs, or surface irregularities.
6. Remove the three screws and strainer screen from
pump.
7. Clean screen thoroughly.
8. Remove pump body screw and feed chamber cover.
9. Measure pump end clearance using a feeler gauge
and straight edge.
10. Measure rotor tip clearance with a feeler gauge.
11. Remove inner and outer feed rotor and pump
chamber body.
12. Repeat measurements for scavenge rotor.
13. Remove inner and outer scavenge rotor and inspect
pump shaft for wear.
Pump End Clearance:
Std: .001-.003 (.0254-.0762 mm)
Wear Limit: .004 (.1016 mm)
Rotor Tip Clearance:
Std: .005 (.127 mm)
Wear Limit: .008 (.2032 mm)
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