1974 Ski-Doo Shop Manual, Page 120Get this manual
REMOVAL Remove or disconnect the following'(if applicable) then lift engine out of vehicle Drive beltMufflerAir silencer tubeChoke cable at carburetorThrottle cable at carburetorFuel lines at carburetor
Prior to installation, place bearings into an oil container and heat the oil to 200 Ffor to 10 minThis will ex pand bearings and easelinstallation
Install bearings with groove outwardCrankshaft end -play is adjusted with shim(s) located between crankshaft and magneto side bearingTo determine correct amount of shim(s), proceed as followsRemove magneto side bearing and existing shim(s)Slide the appropriate crankshaft ring and the retaining disc on the crankshaft(See Tool Section)Position crankshaft assembly into crankcase lower halfMake sure that retaining discs are correctly seated in the groovesGently tap crankshaft counterweight until P.T.Oside bearing bears against retaining discAny free-play between the crankshaft ring and magneto side retaining disc, minus recommended end-play, is the distance to be covered by shim(s)Shims are available in the thickness of 0.1 mm.004", 0.2 mm.008", 0.3 mm.012", 0.5 mm.020", mm.039"