DETROIT DIESEL 53
second spacer when two or more spacers are used
EXAMPLE: A former 1.800" thick spacer and
cap assembly have been replaced by two .500"
thick spacers, one .800" thick spacer and the
new fan hub cap.
When replacing the former fan hub spacer be sure
Install Fan, Hub and Adjusting Bracket
and include the new cap.
New .500" thick and .800" thick fan hub spacers and
1. Attach the fan hub and adjusting bracket assembly
a new fan hub cap replaces the former spacer and cap
to the bracket support on the engine with bolts. lock
assemblies to provide spacers compatible with the six
washers and plain washers. Do not tighten the bolts.
bolt hole mounting fan hub assemblies. The spacers
(individually or in combination) also provide a means
2. Install the drive belts and adjust the belt tension as
for setting the different clearances between the back of
outlined in Section 15.1. If used. install the adjusting
the fan blades and front groove of the crankshaft
bracket, bolt and plain washer shown in Fig. 10.
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
SEC. 5.4 Page 7