5.4 Fan
DETROIT DIESEL 53
Fig. 8. Typical Fan Hub and Adjusting Bracket Details and Relative Location of Parts (In-Line Engine)
slowly by hand. If rough or tight spots are detected, replace the bearing.
Examine the fan blades for cracks. Replace the fan if the blades are badly bent, since straightening may weaken the
blades, particularly in the hub area.
Remove any rust or rough spots in the grooves of the fan pulley and crankshaft pulley. If the grooves are damaged or
severely worn, replace the pulleys.
Assemble Hub and Adjusting Bracket
IN-LINE ENGINES (FORMER):
Refer to Figs. 4 and 8 and assemble the fan hub and adjusting bracket as follows:
I.
Press the shaft and bearing assembly into the adjusting bracket by applying pressure on the outer race of the
bearing, using a suitable sleeve, until the bearing is flush with the pulley end of the bracket.
2. Measure the shaft diameter and the pulley bore. It is important that a .001 " - .002 " press fit be maintained. Then
support the bearing end of the shaft and press the fan hub (pulley) on the shaft to the original dimensions taken
during disassembly. This will assure proper alignment and clearance of the parts.
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