1980 Ski-Doo Shop Manual, Page 53Get this manual
SECTION 03 SUB-SECTION 02 (ENGINES)
To determine end-play, 'perform the followingsa) Measure crankcaseTo do this first measure each half from mating surface to bottom of bearing seatAdd measurements of both halves then add 0.30 mm (.012") for gasket displacementEquals A
Measuring the distance between ball beanng shoulders
c) Subtract measurement from measurement minus toleranceTotal balance is distance to be shimmedShim(s) must be located between magneto side bearing and crankshaft blade
Standard shims must be installed with the inside diameter rounded edge facing crankshaft blade
Bearing seat
Rounded edge facmg crankshaft blade
b) Measure thickness of each ball bearing and of standard shims on each sideand )Measure distance between bearing shoulders on crankshaftAdd measurementsTotal equals B