TM 5-3810-300-24&P-3
OIL COOLER 4.4
7. If the openings are not marked IN and OUT on the oil
30 to 60 seconds). Then, thoroughly flush the oil
cooler core with clean, hot water. After cleaning, dip
cooler it is suggested that they be marked before
the oil cooler core in light oil.
reinstalling the oil cooler.
CAUTION: Protect the eyes and avoid
Clean Oil Cooler Core
breathing the fumes or direct contact of the
1. Clean the oil passages in the oil cooler core by
acid with the skin.
circulating a solution of trichloroethylene through the
passages with a force pump.
Pressure Check Oil Cooler Core
1. Make a suitable plate and attach it to the flanged side
CAUTION: Perform this operation in the
of the oil cooler core. Use a gasket made from
open or in a well ventilated room. Avoid
rubber to ensure a tight seal. Drill and tap the plate
breathing the fumes or direct contact of the
to permit an air hose fitting to be attached at inlet side
chemicals with the skin.
Clean the oil cooler core before the sludge hardens.
If the oil passages are badly clogged, circulate an
2. Attach an air hose and apply 75-150 psi air pressure.
Oakite or alkaline solution through the oil cooler core
Then, submerge the oil cooler core and plate
assembly in a tank of heated water (180F.). Any
and flush it thoroughly with clean, hot water.
leaks will be indicated by air bubbles in the water.
NOTE: Do not attempt to clean an oil cooler
core when an engine failure occurs in which
CAUTION: When making pressure test, be
metal particles from worn or broken parts
sure that personnel are adequately
are released into the lubricating oil. In this
protected against any stream of pressurized
instance, replacement of the oil cooler core
water from a leak or rupture of a fitting, hose
is strongly recommended.
or the oil cooler core.
2. After cleaning the oil passages, clean the water side
3. After the pressure check is completed, remove the
of the oil cooler core by immersing it in a solution
plate and air hose and dry the oil cooler core with
made as follows: add one-half (1/2) pound of oxalic
compressed air. Replace the oil cooler core if leaks
acid to each two and one-half (2-1/2) gallons of a
were indicated.
solution composed of one-third (1/'3) muriatic acid
NOTE: In cases where a leaking oil cooler
and two-thirds (2/3) water. The cleaning action is
evident by the bubbling and foaming. Carefully
engine, the engine must be immediately
observe the process and remove the oil cooler core
flushed to prevent serious damage (refer to
from the solution when the bubbling stops (this
Section 5).
usually takes from
Install Oil Cooler
The lubricating oil cooler may be installed by reversing the
sequence of operations given for removal as follows (Fig. 3).
1. If the oil cooler adapter was removed from the
cylinder block, remove the old gaskets from bosses
where the adapter sets against the block. Affix new
gaskets and then secure the adapter to the cylinder
block with bolts, lock washers, and copper washer.
NOTE: Copper washer must be installed on
the lower right hand adapter-to-block bolt to
Fig. 2. Oil Cooler Core Prepared for Pressure Check
prevent leakage of oil from adapter.
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