1985 Ski-Doo snowmobile Service Manual, Page 50Get this manual
Section 02 ENGINE Sub-section 02 (253 ENGINE TYPE)
IFan housmg Snap ring Shim 121 Bearing 6203 121 Fan shaft Woodruff key Spacer 8Pulley half 9Shim 05 mm 70 Fan 77Lock washer 16 mm 12 Nut MI6
73 14 15 16 17 1819 20 21
V-belr Lock wastier mm (4) Screw M6 30 (4) Fan cover Cylmder cowl Taptile screw MI6 16 Rubber washer (4) Cowl cover (4) Lock washer mm (4) 22Screw M6 12 (3) 23Screw M6 16
CLEANING
Clean all metal components in non-ferrous metal cleaner
15,18,23, Upper fan cowl screwsfan housing screws
At assembly, apply light coat of Loctite 242 on threadsIt should be noted that to correctly remove Loctite locked screw, it is first necessary to slightly tap on head screw to break Loctite bondThe screw can then be removedThis will eliminate the possibility of screw breakage