1978 Ski-Doo Shop Manual, Page 105Get this manual
SECTION 04 SUB-SECTION 01 (ENGINE TOLERANCES! MEASUREMENT) (
CRANKSHAFT END-PLAY
Maximum: 0.10 mm (.004")
NOTE: Crankshaft end-play is adjusted only when crankshaft andor crankcase is replaced
Measuring distance between crankshaft blades
One cylinder engine (247)
Maximum crankshaft end-play should be 0.10 mm (.004")To determine necessary correction: a) Measure crankcaseTo do this first measure each half from mating surface to bottom of bearing seatAdd measurements of both halves then add 0.15 mm (,006") for gasket displacementEquals Ac) Subtract
measurement from measurement minus tolerance of 0.10 mm (,004") maximumTotal balance is distance to be shimmedShirnts) must be located between magneto side bearing and crankshaft blade
Two cylinder engines
(248, 294, 305, 343, 402, 440, 640) ENGINE TYPE 248,294 BEARING SIMULATOR NOAVAILABLE SHIMS