Replace a defective intercooler or
(10) Tighten the four engine mounting nuts (8,
aftercooler tube.
fig. 17), to secure the engine in place.
(3) Inspect the three elbows, and the straight
(11) Install the belt guard (1, fig. 33) on the
fitting for damaged threads.
unit, and replace the three cap screws (4),
and lockwashers (3) which secure the belt
Replace a defective elbow or fitting.
guard to the compressor.
(4) Inspect the safety valve for leaks and for
(12) Install the screw (2), which secures the
loose connections. The blow-off pressure
belt guard to the engine at the clutch
of the safety valve is 70 psi, and prevents
plate, and the screw (7, fig. 8) which
excessive pressure from entering the
secures the bracket (4) to the mounting
high-pressure intake from the low-
base (12).
pressure discharge. Replace a defective
safety valve.
133. Air Coolers
c. Installation.
a. Removal.
(1) Connect the three elbows (4, fig. 34) to
(1) Remove the belt guard, belts, and
the cylinder head (6).
compressor flywheel from the unit (par.
(2) Connect the straight fitting (10) to the
control valve (11).
(2) Disconnect the intercooler (5, fig. 34) from
(3) Connect the aftercooler (9) to the fitting
the two elbows (4), and remove the
(10) and to the elbow (7, fig. 33) at the
elbows from the cylinder head (6).
cylinder head (6).
(3) Remove the screw which secures the
(4) Connect the intercooler (5, fig. 34) to the
intercooler (5) to the mounting base (14),
two elbows (4) at the cylinder head (6).
and remove the intercooler.
(5) Install the two screws (15, fig. 9) into the
(4) Disconnect the aftercooler (9, fig. 33) at
brackets (16),
which
secure
the
the elbow (7), and remove the elbow from
aftercooler to the compressor.
the compressor cylinder head (6).
(6) Install the screw which secures the
(5) Disconnect the aftercooler (9, fig. 34)
intercooler (5, fig. 34) to the mounting
from the straight fitting (10), and remove
base (14).
the fitting from the control valve (11).
(6) Remove the two screws (15, fig. 9), one at
134. Oil Drain Line
each side of the compressor, from the
a. Removal.
brackets, and remove the aftercooler from
(1) Drain all oil from the compressor
the compressor.
crankcase. Refer to LO 5-4930-202-20.
(7) Remove the safety valve (4, fig. 32) from
(2) Remove the coupling (15, fig. 33), nipple
the cylinder head (7).
(14), and elbow (13) from the compressor
b. Cleaning, Inspection, and Repair.
(1) Remove all grease and dirt accumulations
b. Cleaning, Inspection, and Repair.
from the intercooler, and the aftercooler
(1) Clean all parts in an approved cleaning
tubes. Be certain there is no foreign
solvent.
material coating the tubes which could
(2) Inspect all parts for damaged threads,
hamper or obstruct the cooling function.
external damage, or internal obstructions.
(2) Inspect the intercooler tube and the
(3) Replace parts as necessary.
aftercooler tube for any cracks, dents, or
c. Installation.
leaks, which would impair their function.
(1) Install the elbow (13), nipple (14),
74
