1
®
Bendix
®
FD-1
™
Clutch Type Fan Drive
SD-09-8501
FIGURE 1
PRESSURE
PLATE
BEARINGS
BRACKET
O-RING
FIGURE 2
DESCRIPTION
The Bendix
®
FD-1
™
fan clutch is a pneumatically operated,
thermostatically controlled clutch for the engine cooling fan.
Its purpose is to maintain engine temperature by engaging
or disengaging the cooling fan, thereby providing better
fuel economy, greater engine efficiency, faster warm-ups and
a quieter vehicle.
The FD-1
™
clutch is produced in several different models to
accommodate the variety of installation requirements
resulting from the many engine, vehicle and accessory
combinations. Its fail-safe design prevents overheating in
the event of air loss or component or air line failure.
OPERATION
GENERAL
The FD-1
™
fan clutch replaces the standard fan hub on the
engine and is controlled by a temperature sensitive air valve
(see Fig. 5). The same valves used to control radiator
shutters are used to control the FD-1
™
clutch. Installed in
the engine block, the control valve directly senses coolant
temperature. Provided coolant temperature remains below
the setting of the valve, air passes through it to disengage
the fan clutch. When coolant temperature rises to the valve
setting, it closes and exhausts air pressure from the fan
clutch which engages the fan.
TEFLON
BACK-UP
RING
AIR PASSAGE
SHAFT
GREASE
PASSAGE
GREASE
FITTING
SPACER
RETAINER NUT
PISTON
FRICTION
MATERIAL
FAN
SPRING
SPRING
CAGE
FAN PILOT
DOUBLE ROW
BALL BEARING
BEARING
RETAINER
PULLEY
AIR INLET
