1999 Ski-Doo Factory Shop Manual Volume Two, Page 163Get this manual
Subsection 09
Section 04 ENGINE (ROTARY VALVE, COOLANT PUMP AND RESERVOIR)
NOTE: Some verifications can be performed with engine in vehicleRefer to ENGINE DIMENSION MEASUREMENT 04-04
GENERAL
Engine must be removed from vehicle to work on rotary valve shaftcomponentsRefer to Removal and Installation of appropriate engine for proceduresBottom end must be opened to remove rotary valve shaftA16C0NA
420 876 612
CLEANING
Discard all seals and O-ringsClean all metal components in non-ferrous metal cleaner-
CAUTION
To prevent damage to the end of the rotary valve shaft, use pusher (PN 420 876 612)
DISASSEMBLY
1,2, Screw and Rotary Valve Cover