1980 Ski-Doo Shop Manual, Page 69Get this manual
SECTION 03 SUB-SECTION 02, (ENGINES)
Clean rotary valve shaft and inside of distance sleeveAt assembly apply "Loctite 271" Inside of distance sleeveUsing suitable pusher, push coolant pump bearing with shield opposite to rotary valve disc,
Distance ring opening must be in line with crankcase half draining hole,