1972 Ski-Doo Shop Manual, Page 135Get this manual
SINGLE CYLINDER ENGINE (b) Position shims equally on P.T.Oand
2-02-09 Id) Install "0" ringsPress oil seal into bearing cover using the appropriate oil seal pusherIe) Heat the P.T.Ocrankcase half to 2500 -3000 FPosition new gasket on the crankcase stucisPosition the appro priate oil seal protection sleeve on ma gneto crankcase oil seal and adjoin the two (2) crankcase halvesRemove oil seal protection sleeve(f) Install groove ring on ball bearing ol,lter race and gently tap the outer race into p.T.acrankcase half until the groove ring sits against the crankcase4Position the crankcase nuts and washers and finger tighten each nutCross torque each nut to 16 ftlbs(fig2-2-28)