1980 Ski-Doo Shop Manual, Page 98Get this manual
SECTION 03 SUB-SECTION 02, (ENGINES)
ROTARY VALVECOOLANT PUMP
CLEANING
Discard all all seals and "0" nngsRemove old crankcase sealant from rotary valve gear and adjacent bearingClean all metal components in non-ferrous metal cleanerTo Install shaft assembly, use fiber hammerUse no, 420 876 505 pusher to Insert oil seal with lithium grease on seal lip,
Second type
DISASSEMBLYASSEMBLY
8There are two Interchangeable types of rotary valve shaftThe first one IS made of shaft with pinion attached to it by means of key and Allen screwOn the second type, the pinion and the shaft are machined together as single part
To remove rotary valve shaft assembly from crankcase, first remove pump impeller and circlipUSing an appropriate pusher (PIN 420 876 610) and fiber hammer, drive out shaft assembly