1982 Ski-Doo Shop Manual, Page 135Get this manual
SECTION 02 ENGIN SUB-SECTION 07 (640 ENGINE TYPE)
BOTTOM END
12344Crankcase lower half Crankcase upper half Stud MB 56 (crankcase with studs) (2) Hexagonal head screw MB 64 (crankcase with screws (2) Stud MB 37 (crankcase with studs) (9) Hexagonal head screw MB 45 (crankcase with screws) (9) Stud MB 49 Lockwasher (17) Hexagonal nut MB (crankcase with studs) (19) Hexagonal nut MB (crankcase with screws) (B)
8"Loctite 515"
91011121314151617lB1920212223242526272B29
Crankshaft O'ring (2) Shim 015, 0.20, 0.30 mm 8all bearing (6306) (2) O'ring (2) Retaining disk (2) Oil seal (2) Woodruff key 6.5 "Loctite 242" (blue medium strength) Starter gear B6 teeth Distance sleeve 22 mm (4) Stud M12 42.5 (4) Lockwasher (4) Hexagonal nut M12 (4) Stud MB 16 (4) Lockwasher (4) Stud MB (B) Sealing ring (2) Oil drain screw MB (2) Starter support Flat washer (4)