1984 Ski-Doo Shop Manual, Page 156Get this manual
SECTION 02 ENG INE SUB-SECTION 08 (ENGINE DIMENSIONS MEASUREMENT)
Measuring distance between -l" bearing shoulders
NOTE: The 247 engine type has one distance ring on PTO side and adjustment shims on MAG sideThe 277 engine type has one distance ring on PTO side and one distance ring and adjustment shims on MAG side
c) From dimension A, subtract dimension BThe result is the actual crankshaft end-play that must be within specification If the result is over specification, add adjustment shim(s)If the result is under specification, remove adjustment shim(s)