TM 5-4310-277-14
(3) Apply soap solution with a brush to all
(2) Remove the flywheel as illustrated in figure
connections and check for air leaks. Leaks will be
evidenced by bubbles. Tighten or reinstall leaking
b. Cleaning and Inspection.
parts.
Dry cleaning solvent, P-D-680, used to clean
parts is potentially dangerous to personnel
a. Removal. Remove the interstate safety valve as
and property. Avoid repeated and
illustrated in Figure 4-11. Do not disassemble the
prolonged skin contact. Do not use near
valve.
open flame or excessive heat. Flash point of
b. Cleaning and Inspection.
solvent is 100 F. (38oC.) - 138 F. (59 C.).
(1) Clean all parts with cleaning solvent, Federal
Dry cleaning solvent, P-D-680, used to clean
Specification P-D-680, and dry thoroughly.
parts is potentially dangerous to personnel
(2) Inspect the flywheel for cracks, chips,
and property. Avoid repeated and
distortion and wear. Inspect V-grooves for rough or
prolonged skin contact. Do not use near
chipped areas where excessive wear to the V-belts
open flame or excessive heat. Flash point of
could occur. File off all burrs.
solvent is 100 F. (38 C.) - 138 F.
(3) Replace all defective parts.
( 5 9oC . ) .
c. Installation.
Clean the valve with cleaning solvent, Federal
(1) Install the flywheel as illustrated in figure 4-
Specification P-D-680, and dry thoroughly. Inspect
valve for damaged threads or other signs of damage.
(2) Install V-belt set.
Replace if defective.
c. Installation Install the interstage safety valve
as illustrated in figure 4-11.
a. General. The tube assemblies include the in-
tercooler and aftercooler tubes, the sensing,
breather, and head unloader tubes.
a. General. The pilot valve senses air receiver tank
b. Removal.
pressure, and when the pressure is raised to a
(1) Stop the engine.
predetermined setting (approximately 175 psi)
(2) Release the air from the compressor by
(12.3025 kg per sq cm) air is released to the head
opening the draincock.
unloaders. The head unloaders are an intake valve
(3) Remove the tube assemblies as illustrated in
hold open mechanism. When this occurs, the intake
valves are held open and the compressor stops
c. Cleaning and Inspection.
compressing air and runs free until the pilot valve
senses that the pressure in the tank has dropped to
Dry cleaning solvent, P-D-680, used to clean
the predetermined setting (approximately 145 psi)
parts is potentially dangerous to personnel
(10.1935 kg per sq cm). At this time the air is
a n d property. A v o i d repeated and
released from the head unloaders, the intake valves
prolonged skin contact. Do not use near
released, and the compressor starts compressing air
open flame or excessive heat. Flash point of
again. The pilot valve is designed to function as an
solvent is 100 F. (38C. ) - 138 F. (59 C.).
automatic "on" and "off" air switch. A sensing tube
(1) Clean the intercooler and aftercooler tubes
from the air receiver tank to the bottom of the pilot
with a soft bristle brush and cleaning solvent,
valve allows pressure to act on the bottom of the
Federal Specification P-D-680, and dry thoroughly.
valve. When pressure is great enough to overcome
Clean dirt and dust from between the fins to prevent
the spring force holding the valve down on the lower
a buildup which acts as an insulation.
seat, it lifts off the seat and allows air to flow around
(2) Wipe other tubes with a cloth dampened
the valve and out through side ports. One opens to
with cleaning solvent, Federal Specification P-D-
the head unloaders, the other to the pneumatic
680, and dry thoroughly.
cylinder and throttle control on the engine. When the
(3) Blow out all tubing with compressed air.
valve lifts off the lower seat it moves up and seats on
(4) Inspect the tubing for crimps, cracks, and
an upper valve seat where it is held by tank pressure.
breaks. Straighten bent fins. Inspect threaded parts
When pressure falls, the valve spring forces the
for thread damage. Replace all unserviceable parts.
valve back down on the lower seat. Air from the lines
d. Installation.
to the head unloaders and throttle control escapes
(1) Install the tube assemblies as illustrated in
through the upper seat in the pilot valve and out a
vent hole. The pressure at which the valve is "on" or
(2) Start the air compressor.
