TM 5-3810-300-24&P-3
5.4
ENGINE COOLING FAN
The engine cooling fan is belt driven from the crankshaft
2. Loosen the bracket pivot or adjusting bolts until the
pulley (Fig. 1).
bracket is free. Remove the fan, hub and bracket as an
assembly from the engine.
The fan is bolted to a hub and pulley which is carried on
two bearings. The bracket and shaft is mounted on the
Disassemble Fan, Hub and Bracket (Former)
fan support which is in turn attached to the balance
weight cover.
The bracket is slotted to permit
With the fan, hub and adjusting bracket removed from
adjustment of the fan belt tension by moving the bracket
the engine, refer to Figs. 2 and 5 and disassemble as
and shaft on the attaching bolts (Fig. 2). Formerly the
follows:
bracket and shaft were separate pieces and the rear end
of the shaft was supported in the bracket and retained by
1. Remove the bolts, nuts, and lock washers securing
a snap ring.
the fan to the hub. Remove the fan.
At major overhaul the fan bearing hub assembly should
be discarded. Pack the hub assembly, using a new b,
straight, or tapered roller bearing, with Lithium base
multipurpose grease. The fan blades should run in a
vertical plane parallel with and a sufficient distance away
from the rear face of the radiator core to ensure the
blades will not damage the core. Bent fan blades reduce
the efficiency of the cooling system and tend to throw the
fan out of balance.
Adjust Fan Belt
The belt tension and condition of the belts should be
checked as outlined in Section 15.1.
Remove and Install Fan Blades
Remove the fan blades from the hub by removing the
bolts, nuts and lock washers, providing enough
clearance exists between the fan blades and the inner
face of the radiator core with the belt guard and fan
guard removed (Fig. 1). If the blades cannot be
removed in this manner, the fan, hub and bracket may
be removed as an assembly from the support on the
balance weight cover, and then the blades removed from
the hub, see Remove Fan, Hub and Bracket below. The
fan blades may be installed by reversing the procedure
used for removal.
Remove Fan, Hub and Bracket from Engine
1. Remove the two adjusting bolts, lock washers and
plain washers, thus freeing the fan belts
from the hub.
Fig. 1 - Typical Fan and Hub Assembly
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