2008 Polaris Sportsman 500 EFI/X2/Touring/500 H.O. Service Manual, Page 100Get this manual
ENGINE ENGINE REASSEMBLY
Pump Shaft Oil Seal Installation CrankshaftCounter BalanceOil Pump Installation
Lubricate all bearings with clean engine oil before assemblyUse the CrankshaftWater Pump Installation Kit (PN 2871283) to prevent damage to the crankshaft and main bearings during installation1Install the crankshaft into the PTO side crankcaseScrew the threaded rod into the crankshaft until the threads are engaged minimum of one inch (25.4mm)Install the collar, washer, and nut onto the threaded rodHold the crankshaft and tighten the nut to draw the crankshaft into the main bearings until fully seatedLoosen the nut and remove the threaded rod from the crankshaftIf removal is difficult, install two nuts on the end of the threaded rod and tighten against each otherInstall the proper shim on the magneto end of the crankshaftPlace the balancer shaft in the PTO crankcase aligning the timing marks on the crankshaft and balancer gearsInstall the proper shim washer on the shaftInspect the oil pump sealing surface on the crankcaseApply light film of engine oil to the surface and install the oil pump1