1989 Ski-Doo Repair Manual, Page 131Get this manual
Section 02 ENGINE Sub-section 05 (503 ENGINE TYPE)
7Crankcase lower half Crankcase upper half 3Lock washer mm (74) Cylindrical screw M8 75 (2) 5Screw M8 70 (6) 6Loctite 575 Stud MB 773 (8) BCable grommet 9Rubber plug (5) 70Crankshaft 77Ball bearing 6206 (2) 72Shim mm (2)
73Spacer
74Seal PTO side 75Ball bearing 6207 76O-ring
77Seal mag side 7BWoodruff key
792027222324Loctite 242 Cylindrical screw MB 45 (2) Screw M8 45 (4) Hexagonal nut M22 7.5 Lock washer 22 mm Anti-seize lubricant
NOTE: Engine must be removed from chassis to perform the following procedures
PTO side
CLEANING
Discard all seals, gaskets and O-ringsClean all metal components in non-ferrous metal cleanerRemove old sealant from crankcase mating surfaces with Bombardier sealant stripper (PIN 413 7021 00)CAUTION: Never use sharp object to scrape away old sealant as score marks incurred are detrimental to crankcase sealing