1982 Ski-Doo Shop Manual, Page 142Get this manual
SECTION 02 ENGINE SUB-SECTION 07 (640 ENGINE TYPE)
CLEANING
Clean all metal components in non -ferrous metal clean er
DISASSEMBLYASSEMBLY
Lock fan pulley with special holder wrench to remove
or install pulley retaining nut(Use tool PIN 420 977
At assembly, apply light coat of "Loctite 242" on threads It should be noted that to correctly remove Loctite locked screw, it is first necessary to slightly tap on screw head to break Loctite bond The screw can then be removedThis will eliminate the possibility of screw breakage AR NIN G: If fan protect or is removed, always reinstall after servicing