1984 Ski-Doo Shop Manual, Page 130Get this manual
SECTION 02 ENGINE SUB-SECTION 06 (503 ENGINE TYPE)
CLEANING
Clean all metal components in non-ferrous metal cleaner
1,4, Fan housingbearings
It is first necessary to heat bearing housing to 65C (150F) to remove or install bearing
DISASSEMBLY AND ASSEMBLY
13, Fan retaining nut
To remove or install fan pulley retaining nut, lock fan pulley with special holder wrench (Use tool PIN 420 876 355), At assembly, torque not to 65 N-m (48 ft-Ibs)
23,27, Upper fan cowl screwsfan housing screws