1985 Ski-Doo snowmobile Service Manual, Page 206Get this manual
Section 02 ENGINE Sub-section 10 (ENGINE DIMENSIONS MEASUREMENT) 14II
Total shim thickness needed for the end-play adjustment is determined by the following procedures:Distance ring and crankshaft bearing must be in place on PTa side Install the distance ring and the bearing simulator onto crankshaft MAG side- POSition the crankshaft into the lower half crankcase with the shim on PTa side Using plastic hammer, gently tap the crankshaft end then the bearing simulator to take all the slack
End-play is adlusted with shims
Gently tap onto crankshaft end
AOO1002032
Bearing Slmuiator
253 engine type
ENGINE TYPE MINIMUM MAXIMUM