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ENGINES
COOLING SYSTEMS
FAN REMOVAL
There are several types of metal fans available
for all engines. Most engines with a standard
cooling system use a four-bladed rigid fan.
Certain engines are fitted with standard equip-
ment multi-bladed viscous drive (Tempatrol)
fans.
1 - Silicone Fluid Chamber
2 - Mounting Flange
3 - Fan Blade Attaching Bolts (4)
42415
Fan blade assemblies are balanced within
0.25 ounce and should not be altered in any
way. Replace a damaged or bent fan. Do not
attempt repair. Refer to the Cooling System
Components chart for fan applications.
CAUTION: Fans are designed to be compatible
with certain applications only. Do not attempt to
increase the cooling capacity by installing a fan
not intended for a given engine. Fan or water
pump damage and noise may result.
Disconnect the fan shroud from the radiator, if
equipped.
Remove the belt(s).
Remove the attaching nuts and remove the fan
and drive as a unit.
Remove the fan shroud.
Tempatrol Drive Unit/Fan Blade Unit Removal
The Tempatrol drive unit should be replaced
if there is an indication of a fluid leak, noise or if
roughness is detected when turning by hand. If
the drive cannot be turned by hand, or if the
leading edge of the fan can be moved more than
6.35mm (1/4-in) front to rear, replace the drive
unit.
If it is necessary to replace either the Tempatrol
fan blade unit or the drive unit separately, use
the following procedure.
CAUTION: Engines equipped with a serpentine
(single) drive belt have a reverse rotating water
pump and viscous (Tempatrol) fan drive
assembly. The components are identified by the
words " R E V E R S E " stamped on the cover of the
viscous drive and inner side of the fan, and
"REV" cast into the water pump body. Do not
install components that are intended for non-
serpentine drive belts.
C A U T I O N : To prevent silicone fluid from
draining into the fan drive bearing and
contaminating the lubricant, do not place the
Tempatrol fan unit on the work bench with the
rear mounting flange down.
Remove the bolts attaching the fan blade unit to
the drive unit.
Tempatrol Drive Unit/Fin Hade
Unit Installation
Attach the replacement unit. Tighten the bolts
with 24 N-m (18 ft-lbs) torque.
B-177
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