1989 Ski-Doo Repair Manual, Page 202Get this manual
Section 02 ENGINE Sub-section 07 (583 ENGINE TYPE)
2, Rotary valve cover bolt
The rotary valve cover bolts musl be torqued lO 20 N-m f15 Ibf-ft)
7,15, Rotary valve shaftgear
Backlash check Engine do not have to be overhauled to check backlash of crankshaft and rotary valve shaft gearsRemove spark plugs, cover and rotary valveCheck backlash at one position then turn crankshaft about 18 turn and recheck Continue lhis way to complete one revolutionBacklash must be even at all pOSitionsOtherwise overhaul engine to find which part is faulty (gear, rotary valve shaft or crankshaft with excessive deflection ICheck for presence of brass filings in gear housingReplace gear if neededBesides, check deflection of rotary valve shaft and crankshaft close to gearReplace as needed