DETROIT DIESEL 53
second spacer when two or more spacers are used
thickness. Then reassemble the fan hub and check the
9. Fill a new fan hub cap 3/4 full of grease and install it
in the end of the fan hub (pulley).
Install Fan, Hub and Adjusting Bracket
1. Attach the fan hub and adjusting bracket assembly
to the bracket support on the engine with bolts, lock
New .500 " thick and .800 " thick fan hub spacers and a
washers and plain washers. Do not tighten the bolts.
new fan hub cap replaces the former spacer and cap
assemblies to provide spacers compatible with the six
2. Install the drive belts and adjust the belt tension as
bolt hole mounting fan hub assemblies. The spacers
outlined in Section 15.1. If used, install the adjusting
(individually or in combination) also provide a means for
bracket, bolt and plain washer shown in Fig. 10.
setting the different clearances between the back of the
fan blades and front groove of the crankshaft pulley.
3. Install the fan (and fan spacer and cap, if used) on
the hub and secure it with the 5/16 "-18 bolts and lock
The new spacers have a flange on one side that serves
as a pilot for the fan as well as a spacer pilot for the
1972 General Motors Corp.
SEC. 5.4 Page 7