DETROIT DIESEL 53
Fig. 3 - Removing Fan Hub (Pulley)
Bent fan blades reduce the efficiency of the cooling
system, may throw the fan out of balance, and are apt
to damage the radiator core. Before removing the fan
blades, check the blades for alignment. Do not rotate
the fan by pulling on the fan blades.
Fig. 4 - Former Fan Hub Assembly (In-Line
1. Remove the attaching bolts and lock washers and
remove the fan and spacer (if used).
CAUTION: Damage to the bearing will result if
force is applied to the shaft.
2. Loosen the fan hub adjusting bracket bolts and
remove the drive belts. Then withdraw the bolts and
IN-LINE ENGINES (CURRENT):
washer and remove the the huh and bracket assembly
from the engine.
1. Remove the fan hub cap.
2. Remove the hub bolt and washer.
Disassemble Hub and Adjusting Bracket
3. Withdraw the hub and bearing assembly from the
shaft. It may be necessary to tap the end of the shaft
IN-LINE ENGINES (FORMER):
with a soft hammer to loosen the hub assembly.
1. Measure the distance between the rear face of the
4. Remove the oil seal and bearing from the fan hub
rim on the pulley and rear face (machined) of the fan
adjusting bracket Record this measurement for
5. Remove the bearing spacer, shims and grease
2. Remove the fan huh from the shaft with a puller as
shown in Fig. 3.
3. Place the bracket assembly in an arbor press. Then
place a suitable sleeve over the shaft and against the
outer race of the bearing and press the hearing and
shaft assembly from the bracket.