(4) Insert the three studs (14), with the special nuts (18), spacers (19), spring washers (20) and end washers
(21) installed, through the mounting flanges of the aftercooler and connection. Install and tighten the self-
locking nuts (13) until the distance from the outer spring washer on each stud to the surface of the
aftercooler flange measures one inch (fig. 53).
117. Aftercooler
a. Removal and Disassembly (fig. 51).
(1) Remove the aftercooler to receiver connection (par. 116a).
(2) Loosen the hex nut (35) so that the clamp (38) can be swung away from the engine support brace (32).
(3) Remove the self-locking nuts (13) from the three studs (14) connecting the aftercooler manifold to the
compressor discharge manifold, and remove the studs with the special nuts (18), spacers (19), spring
washers (20) and end washers (21) installed.
(4) Lift the assembled aftercooler (40) and flywheel guard (28) from the engine-compressor. To disassemble
the flywheel guard from the aftercooler, remove the two cotter pins (26) and castellated nuts (27) and three
self-tapping screws (24). Note that plain washers (23) are located on the two studs between the guard and
aftercooler.
b. Cleaning and Inspection. Blow the dirt, leaves, twigs and other debris from between the fins of the aftercooler with
compressed air. Wipe the grease or oil from all parts with a cloth dampened in cleaning solvent. The packing used at the
aftercooler intake and outlet must be discarded and replaced. Inspect the aftercooler fins for good condition. Where fins
have been bent or crushed together, straighten and separate them as well as possible to permit free circulation of air.
c. Reassembly and Installation (fig. 51).
(1) Assemble the packing (22) to the sleeve (25) and insert these parts into the recess in the compressor
manifold discharge opening.
(2) Install the plain washers (23) on the aftercooler brace studs, and fasten the flywheel guard (28) to the studs
with the castellated nuts (27) and cotter pins (26). The brace (29) welded to the top of the guard is secured
to the aftercooler with three self-tapping screws (24).
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