1972 Ski-Doo Shop Manual, Page 85Get this manual
GEAR BOX
1-13-07 (c) Position the shift sprocket bearing on the drive shaftBearing groove must be on driven pulley side of shaftUsing bearing pusher, push the bearing into place on shaft (fig1-13-21 lInstall the groove ring into bearing grooveSl ide the oil seal onto shaftEnsure that oil seal spring is facing bearing
shim and add required thickness of shim(s) to take up end playReinstall previously removed end shim and place drive chain over sprocket teethPlace the assembled lay gear into location making sure 'that the dowel tube sits in lower housing orifice (fig'-13-19)
Bearing -pusher
Bearing
NOTE: Drive chain must be positioned on lay gear sprocket with the locking clip facing the lay gear4To assemble and install the drive shaft assembly, use the following procedure: (a) Slide the washer, shift sprocket, needle cage, shims, distance sleeve and circlip onto the driven pulley side of shaft(b) Using feeler gauge, check total free play between components installed on shaftFree play must not exceed 0.006 to 0.012 inchIf free play is not within tolerance, remove circlip and distance sleeve from shaftAdd required thick ness of shims to take up free playInstall distance sleeve and circlip on shaft (fig1-13-20)