MAINTENANCE OF RADIATOR ASSEMBLY
7-1. GENERAL. The radiator assembly consists of a
radiator core with removable tanks, fan, and fan motor.
The fan is enclosed by a guard and located in a shroud
attached to the radiator. An electric motor drives the fan
via belts and sheaves (Code. A) or directly (Code B);
see note below for explanation of codes. The radiator
system cools the engine, lubricating oil cooler, and the
intercooler. It reduces engine temperature and
maintains coolant temperature at 125F (52C) when
generator set is operated at continuous loads. When
the housing kit is installed, a thermostatically controlled
shutter assembly controls airflow to radiator by means of
The radiator installation on earlier
units (serial numbers FZ00001 thru
FZ00064) differs from later units
FZ09150), therefore the former in the
following discussion is referred to as
Code A and the latter as Code B.
Preliminary. Preliminary inspections consist of
connections), and coolant level may be checked
at the sight glass. If coolant level is below sight
glass, remove radiator cap and check level in
WHENEVER GENERATOR SET HAS
JUST BEEN SHUT DOWN, REMOVE
RADIATOR CAP SLOWLY TO ALLOW
PRESSURE TO ESCAPE BEFORE
approximately 2 inches (50 mm) below filler
neck level. Using a hydrometer, verify that
antifreeze is in accordance with table 3-1 in the
Operator/Crew and Organizational Maintenance
Radiator Core Test. Remove radiator in
accordance with instructions in paragraph 7-3 or
Test the radiator for leaks by placing the radiator,
with all outlet connections sealed, in a tank of water.
Apply compressed air at 10 to 15 psi (0.7 to 1
kg/cm2) at filler opening and observe for leakage
indicated by air bubbles in the water. Repair if
7-3. RADIATOR REPLACEMENT, CODE A . Remove
and replace radiator assembly as follows:
If generator set has a housing kit installed,
remove panels and shutter assembly in
accordance with Chapter 15. (See figure 7-1)
Drain coolant from radiator, remove clamps
(26, 22, 29, 32, 6, 7 and 13) and disconnect
hoses (27, 25, 33, 16, 8, and 12).
Tag and disconnect electrical leads to fan
Remove belt guard (58) by removing screws
(55), nuts (57), and washers (56).
Loosen adjusting screw on motor mount base
(65) and slide base slightly together with fan
motor (64) to loosen belts (59).
Remove belts (59).
Remove screws (47), washers (48 and 49)
and nuts (50), that secure radiator assembly
to skid base.
Remove both support tubes (41).