1982 Ski-Doo Shop Manual, Page 141Get this manual
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SECTION 02 ENGINE SUB-SECTION 07 (640 ENGINE TYPE)
61 N.m (45 ft-Ibs)
7 Fan housing 2 Circlip 3 Fan 4 Bearing (2) 5 Washer (2) 6 Woodruff key 7 Washer 8 Pulley half (2) 9 Shim(s} 70