1979 Ski-Doo Supplementary Shop Manual, Page 66Get this manual
SECTION 04 SUB-SECTION 02 (ENGIN ES)
Prior to installation, place bearings into an oil container F)and heat the oil to lOoDe (212 This will expand bearing and ease installationInstall bearings with groove as per the following il lustration
To insure adequate oil supply to the bearing on the magneto side, install oil seal with gap of at least 0.8 mm L030"} with bearingOn P.T.Oside, install oil seal flush with crankcase; do not push furt hermore, there will be gap of 05 mm L020"}