DETROIT DIESEL 53
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.
1. Remove the attaching bolts and lock washers and remove the
fan and spacer (if used).
2. Loosen the fan hub adjusting bracket bolts and remove the
drive belts. Then withdraw the bolts and washers and remove the
hub and bracket assembly from the engine.
Disassemble Hub and Adjusting Bracket
IN-LINE ENGINES (FORMER):
1. Measure the distance between the rear face of the rim on the
pulley and rear face (machined) of the fan adjusting bracket. Record
this measurement for reassembly purposes.
2. Remove the fan hub from the shaft with a puller as shown in
Fig. 3. Removing Fan Hub (Pulley)
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 bearing and shaft assembly from the bracket.
CAUTION: Damage to the bearing will result if force is applied to the shaft.
IN-LINE ENGINES (CURRENT):
Remove the fan hub cap.
Remove the hub bolt and washer.
3. Withdraw the hub and bearing assembly from the shaft. It may
be necessary to tap the end of the shaft with a soft hammer to loosen
the hub assembly.
Remove the oil seal and bearing from the fan hub.
5. Remove the bearing spacer, shims and grease retainer.
Fig. 4. Former Fan Hub Assembly (In-Line