1985 Ski-Doo snowmobile Service Manual, Page 43Get this manual
Section 02 ENGINE Sub-section 02 (253 ENGINE TYPE)
1234567 8
Upper crankcase Rubber plug (2) OJ! seal PT.oside Shim Ball bearing 620.6 (2) Distance flflg (2) Crankshaft Woodruff key
9Shim (as required) 10Bearing retainer 11Oil seal magside 12Loctite 515 13Lower crankcase 14Lock washer M6 121 15Screw M6 3D 121
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 stripperCAUTION: Never use sharp object to scrape away old sealant as score marks incurred are detrimental to crankcase sealing
DISASSEMBLY
General
Oil seal
To remove magneto, refer to "Magneto" in this sectionAOO3002003
5, P.T.Oside bearingMAGside bearing