1978 Ski-Doo Shop Manual, Page 134Get this manual
SECTION 04 SUB-SECTION 02 (ENGINES)
BonOM END
CLEANING
Discard all oil seals, gaskets and "0" ringsClean all metal components in non-ferrous metal cleanerRemove old sealant from crankcase mating surfaces with Bombardier sealant stripper_ Any free-play between the bearing simulator and magneto side retaining washer, minus maximum 0.1 mm (,004") end-play, is the distance to be covered by shirnts)Shims are available in the thickness of 0.15 mm (,006"),0.20 mm (,008") and 0.30 mm (,012")Bearing simulator
CAUTION: Never use sharp object to scrape away old sealant as score marks incurred are detrimental to crankcase sealing
DISASSEMBLY
General
Refer to Technical Data Section for component fitted tolerance and wear limit