MAINTENANCE OF COOLING SYSTEM
Section I. DESCRIPTION AND FUNCTION
ator and forces it out openings near the engine. The
engine air outlet uses a shutter assembly to control
engine temperature. A thermostatic element controls
The engine has a pressure air cooling system. Fins
shutter opening which limits air flow when the engine
on the engine blower draw air into the front of the
is cold. When the engine air temperature reaches
engine housing and force it past the cylinders and out
approximately 120° F, (49 C) the shutters begin to
the right side of the engine. A separate blower on the
open. The shutters are completely open at 140° F
generator rotor draws air into the rear of the gener-
(60° C) under full rated load.
Section II. MAINTENANCE
3-2. ENGINE COOLING SYSTEM.
a. Inspect on equipment (see figure 3-1). On ASK equipped
generators, refer to Operator and Organizational Maintenance
Manual and remove cover assembly and exhaust plenum.
(1) Shutter Assembly. Inspect shutter assembly
(1) for physical damage. Check for debris within as-
sembly. Check for smooth operation of shutters when
moved manually. Check for chipped paint or rusting.
(2) Bracket Assembly. Inspect that brackets (2)
are securely mounted to shutters (3). Check that
bracket bearings are not excessively worn. Refer to
and Organizational Maintenance
(3) Shutters. Inspect shutters (3) for physical
damage and secure mounting to brackets (2).
(4) Air Housing Panel and Door. Inspect air hous-
ing panel and door (5) for physical damage.
(5) Grille. Inspect grille (6) for secure mounting
to blower housing (7). Check for physical damage.
(For units without ASK.)
(6) Blower Housing. Inspect blower housing (7)
for physical damage. Check that blower housing is
securely mounted to engine.
b. Removal. Refer to Operator and Organizational Maintenance
c. Disassemble. Disassemble repairable com-
ponents of the cooling system per Operator and
Organizational Maintenance Manual.
Solvent, Dry Cleaning P-D-680, Type II is
flammable and moderately toxic to skin, eyes
and respiratory tract. Eye and skin protec-
tion required. Good general ventilation is
(1) Shutter Assembly. Refer to Operator and
Organizational Maintenance Manual to remove and
replace defective components. Repair physical damage
by removing the dents, welding breaks in shutter as-
sembly box. Clean repaired area with dry cleaning
solvent Federal Specification P-D-680. Paint as re-
quired with MIL-T-704, type A, semigloss, olive drab,
color no. 24087.
(2) Bracket Assemblies. Replace bracket (2) or
bearings if required.
(3) Shutters. Bump out dents and straighten shut-
ters (3) if required. Clean with dry cleaning solvent
and repaint if necessary.
(4) Air Housing Panel and Door. Clean air hous-
ing panel and door (5) with dry cleaning solvent and
repaint if necessary.
(5) Grille. Straighten any bent wires on grille
(6) or weld if required to repair. (For units without ASK.)
(6) Blower, Housing.
Bump out dents in blower
housing (7), repair cracks with welds if necessary
and clean with dry cleaning solvent. Paint as required.
e. Installation. Install engine cooling system. On ASK equipped
generators, install cover and exhaust plenum assemblies per
Operator and Organizational Maintenance Manual.
3-3. HIGH TEMPERATURE CUTOUT SWITCH.
a. Remove (see figure 3-1). On ASK equipped generators,
refer to Operator and Organizational Maintenance Manual and
remove top panel assembly and exhaust plenum.
(1) Disconnect electrical leads (10).
(2) Straighten locking tab (12) and remove switch
Change 6 3 - 1