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TM 10-3930-633-12
indicate previous radiator leakage. These spots
away from the engine until belt tension is firm.
may not be damp if water only or methyl-alcohol-
Then tighten the alternator mounting bolts and
base anti-freeze is in the cooling system since
check the tension as indicated above. Reset the
such coolants evaporate readily. An ethylene-
alternator as necessary for correct belt tension.
glycol-base antifreeze shows up existing leaks as
Finally, torque the alternator mounting bolts 25
it does not evaporate.
to 35 ft/lb.
c. Radiator Flushing.
(1) It is recommended when using water for
coolant that the cooling system be flushed and
checked for leaks twice a year, preferably in the
fall before antifreeze is added and in the spring
when the antifreeze is drained.
(2) Reverse flushing will aid greatly in
removing rust and scale, especially when used
with a flushing solution. A cleaning solution
should be used to loosen the rust and scale before
reverse flushing the cooling system.
(3) Flushing is accomplished through the
system in a direction opposite to the normal
coolant flow. This action causes the water to get
behind the corrosion deposits and force them out.
Continue this flushing operation until the water
runs clear through the top hose.
d. Radiator Removal. Refer to figure 4-33 and
proceed as follows:
Figure 4-35. Belt Tension Adjustment
(1) Remove the engine cooling fan from the
4-67. Radiator
fan hub on the water pump shaft.
a. General Maintenance and Inspection.
(2) Drain the cooling system.
Maintenance of the radiator consists of keeping
(3) Disconnect the upper and lower radiator
the exterior of the radiator core clean, the interior
hoses from the radiator.
free from rust and scale, and the radiator free
(4) Disconnect the transmission oil cooler
from leaks. Check the cooling system fluid level
lines at the bottom radiator tank. Plug trans-
and for leaks each 100 operating hours. The
mission oil cooler ports in the radiator im-
exterior of the radiator core should be cleaned and
mediately to prevent system contamination.
the radiator inspected for leaks each 100 hours of
(5) Remove bolts (14), washers (17), nuts
normal service of the vehicle. Cleaning should be
(15), rubber mounts (16), and remove radiator
performed by blowing out with air stream or
from the vehicle.
water stream directed from the rear of the
e. Testing Radiator for Leakage.
radiator. Visual inspection is not sufficient as the
(1) With radiator removed from vehicle,
accumulation of small particles of foreign material
install radiator cap and block or plug the upper
on core surfaces can restrict cooling without
and lower radiator hose connections.
closing the core openings.
(2) Remove the drain cock and connect an air
__
b. Radiator Leakage. Radiator leakage oc-
line with an air pressure gage to the drain cock
casionally results from corrosion perforation of
port.
the metal but most leakage results from
(3) Submerge the radiator in a tank of water.
mechanical failure of soldered joints when too
Open the air line to the radiator and apply a
much strain has been put on the joint. Fractures
pressure of not more than 12 to 15 PSI.
occur most often at the joint where the radiator
(4) Watch the radiator for signs of bubbles
inlet and outlet pipes are attached to the tanks.
coming from the core during this pressure test.
When the seams break, the entire soldered joint is
The pressure cap should open at 12 to 15 PSI.
exposed and can corrode, but breakage rather
Shut off the air to the radiator and allow the air to
than corrosion is the primary cause of seam
escape until the safety cap seats. Hold the
leakage, Examine the radiator carefully for leaks
pressure for 5 minutes. If no bubbles appear from
before and after cleaning. Cleaning may uncover
the core, the radiator is good. If bubbles appear,
points of leakage already existing but plugged
mark the origins of the bubbles and remove the
with rust. White, rusty, or colored leakage stains

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