1989 Ski-Doo Repair Manual, Page 132Get this manual
Section 02 ENGINE Sub-section 05 (503 ENGINE TYPE)
ASSEMBLY
11,15, PTa side bearingMAG side bearing
Smear anti-seize lubricant (PIN 413 701000) on part of crankshaft where bearing fitsPrior to installation, place bearings into an oil container filled with oil heated to 75C (16JDF) This will expand bearings and ease installationInstall bearings with groove as per exploded viewBearings are pressed on crankshaft until they rest against radiusThese radius maintain the gap needed for bearings lubrication
1,2, Lower and upper crankcase
Crankcase halves are factory matched and therefore, are not interchangeable as single halves
6, Loctite 515
Prior to joining of crankcase halves spray some new in jection oil (or equivalent) on all moving parts of the crankshaftThen apply Loctite 515 (413 7027 00) on crankcases mating surfacesNOTE: Prior to apply Loctite 515 it is possible to use primer (p IN 413 705300) or primer NF (p IN 413 7024 00)It increases cure speed and gap filling capabilityRefer to supplier instructionsPosition the crankcase halves together and tighten bolts by hand then install and tighten armature plate on magneto side to correctly align the crankcase halves