1989 Ski-Doo Repair Manual, Page 168Get this manual
Section 02 ENGINE Sub-section 06 (536 ENGINE TYPE)
7, Rotary valve shaft
To install rotary valve shaft proceed as foliOlNs with the suitable tools:pusher (P IN 420 8766 05)- water pump seal sleeve (PIN 420 876980)Rotar' shaft
To correctly install the rotary valve, proceed 8S foUows:
- Turning crankshaft counter clockwise, (drive pulley side) bring magneto side to top dead center using TOe gaugeO
(PIN 4208769 eO!
siEleYl'!
NOTE: Do n01 use crankshaft locking tool to find out magneto side top dead centerIt will not give the right position- Position the rotary valve on gear in such way that its closing edge will be as close as possible to the bottom of the magneto side inlet port, and its opening edge in line with the mark (ridge) on the upper lett side of the rotary valve housing