1986 Ski-Doo Factory Shop Manual, Page 204Get this manual
Section 02 ENGINE Sub-section 09 (537 ENGINE TYPE)
CAUTION; Ensure that the rotary valve shaft is perfectly perpendicular with the press tip or damage will occurClean rotary valve shaft and inside of distance sleeveAt assembly apply Loctite 271 inside of distance sleeve
7.8, Rotary valve shaftseal
At assembly apply lithium grease on seal lipsPosition the seal with shield portion towards rotary valveSeal
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To install ball bearing 6201 use ball bearing pusher (PIN 420 876 500)Rotary valve
Shim 0.5 mm Lnctile 515
7,9Rotary valve shaftbearing 6203