1982 Ski-Doo Shop Manual, Page 136Get this manual
SECTION 02 ENGINE SUB-SECTION 07 (640 ENGINE TYPE)
CLEANING
Discard all oil seals, gaskets, "0" rings and sealing rings Clean all metal components in non-ferrous metal cleanerRemove old sealant from crankcase mating surfaces with Bombardier sealant stripper_ CAUTION: Never use sharp object to scrape away old sealant as score marks incurred are detrimental to crankcase sealing
INSPECTION
The inspection of the engine bottom end must include the following measurements:
TOLERANCES MEASUREMENTS FITTING NEW PARTS (MIN (MAX N.A.20 mm 1.0079") N.A.20 mm 1.0079") N.A.53 mm 1.0208") .A .40 mm 1.0158") WEAR LIMIT
Crankshaft deflection Connecting rod big end axial play Conn ecting rod alignment Crankshaft end play
.08 mm (0031") 1.0 mm 1.0394") .AN.A
DISASSEMBL Y