1989 Ski-Doo Repair Manual, Page 139Get this manual
Section 02 ENGINE SUb-section 05 (503 ENGINE TYPE)
NOTE: The following procedores can be done without removing the engine from chassis
5, Fan shaft
Using press, drive the fan shaft out
CLEANING
Clean all metal components in non-ferrous metal cleaner
DISASSEMBLYASSEMBLY
13, Fan retaining nut
To remove or install fan pulley retaining nut, lock fan pulley with special holder wrench (Pl 4208763 551At assembly, torque not to 65 N.m (48 Ibr.ftl
A023 002
1,3,4, Fan housing, shim and bearing