4-20. RADIATOR AND COOLING SYSTEM - Continued
4-20.1 Radiator and Shutter Assembly - Continued
Radiator Shroud Repair
Engine coolant can cause severe burns. Allow engine to cool before attempting to maintain the
The shroud can be repaired without removing radiator from the truck.
If the shroud is bent or dented such that it
interferes with the fan, bend shroud away from
fan. Always test clearance by rotating fan by
hand before starting engine. To disengage fan
clutch, set fan switch to AUTO.
If shroud is very badly damaged, replace as
Remove engine compartment canopy, see para.
Remove fan hub nuts and nut retaining the fan
clutch piston. Remove the piston. Place fan
against radiator, within the shroud.
Disconnect air hose from fan clutch piston and
pull out of shroud.
Remove the hoses and tubes connected to the
upper tank on the radiator, see para. 4-20.3.
Remove the radiator overflow hose from shroud.
Undo capscrews attaching shroud to radiator.
Pull shroud and fan up through the roof canopy.
Replace shroud and fan and reattach to radiator
Replace hoses and tubes connected to the upper
tank on the radiator, see para. 4-20.3.
Thread air hose through fan shroud and attach to
fan clutch piston.
Install fan and fan clutch piston on fan hub.
Tighten fan retaining nuts to 75 ft lb (100 Nm).