1983 Ski-Doo Shop Manual, Page 96Get this manual
SECTION 02 ENGINE SUB-SECTION 05 (503 ENGINE TYPE) )
CLEANING
Clean all metal components in non-ferrous metal cleaner
DISASSEMBLY AND ASSEMBLY
To remove or install fan pulley retaining nut, lock fan pulley with special holder wrench(Use tool PIN 420 876355), At assembly, torque nut to 62 N.m (46 ft-Ibs)
Holder wrench