1985-1995 Polaris ATV and Light Utility Hauler Service Manual, Page 318Get this manual
ENGINES Magnum Engine Assembly Crankcase Assembly 1Remove all traces of gasket sealer from the crankcase mating surfacesInspect the surfaces closely for nicks, burrs or damage2Check the oil pump and oil gallery mating surfaces to be sure they are clean and not damaged
Bearing Installation
NOTE: To ease bearing installation, warm the crankcase until hot to the touchPlace the bearings in freezer
3Install the bearings so the numbers are visible4Drive or press new bearings into the crankcases, using the proper driverCAUTION: Press only on outer race of bearing to prevent bearing damage 70mm (2.755") driver- For crankshaft main bearings 46mm (1.810") For counter balancer bearings 28mm (1.100") For pump shaft bearing