1985 Ski-Doo snowmobile Service Manual, Page 194Get this manual

1985 Ski-Doo snowmobile Service Manual, Page 194

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Section 02 ENGINE Sub-section 09 (537 ENGINE TYPE)
,CAUTION: To prevent damage to the end of the rotary valve shaft, use pusher (tool PIN 420876 610)
7,8, Rotary valve shaftseal
At a