2003 Polaris ATV Trail Boss 330 Factory Service Manual, Page 79Get this manual
CRANKSHAFT INSTALLATION
Lubricate all bearings with clean engine oil before assembly
2Install oil pump coverTorque screws to specified torque
Oil Pump Cover Screw Torque: 4-5 ftlbs(5-7 Nm) 1Install the crankshaft into the PTO side crankcase2Install the proper shim on the magneto end of the crankshaftNOTE: Do not use gasket sealer on the pump mating surfaces
CRANKCASE OIL STRAINER INSPECTION
1Remove bolt securing oil strainer to the MAG side crankcase2Remove oil strainer and visually inspect for any rips, tears or obstructions in screen3Replace oil strainer if it fails visual inspection
OIL RELIEF VALVE INSTALLATION
Install the oil relief valve, spring, and plug using new sealing washer
CRANKCASE REASSEMBLY
1Apply Crankcase Sealant (PN 2871557) to the crankcase mating surfacesBe sure the alignment pins are in place2Set the crankcase in position carefullyMate the crankcase halves by tapping lightly with soft faced hammerContinually check alignment of the cases during installation, closing the gap equally until the surfaces are tightly sealed3Install the crankcase flange bolts and tighten to specified torque in steps according to the torque patternSee Page 3.4