4.4 Lubricating Oil Cooler
DETROIT DIESEL 53
are adequately protected against any
Clean Oil Cooler Core
stream of pressurized water from a
Clean oil side of Core. Remove the core from
leak or rupture of a fitting, hose or
the oil cooler. Circulate a solution of trichloroethylene
the oil cooler core.
through the core passages with a force pump to remove
the carbon and sludge.
After the pressure check is completed, remove
the plate and air hose from the cooler core, then dry the
CAUTION: This operation should be
core with compressed air.
done in the open or in a well
NOTE: In cases where a leaking oil
trichloroethylene or other toxic
chemicals are used for cleaning.
engine must be immediately flushed
Clean the core before the sludge hardens. If the oil
to prevent serious damage (refer to
passages are badly clogged, circulate an Oakite or
alkaline solution through the core and flush thoroughly
with clean, hot water.
Install Oil Cooler Core
Clean water side of Cooler After cleaning the oil
side of the core, immerse it in the following solution:
Clean the old gasket material from both faces of
Add one-half pound of oxalic acid to each two and one-
the core flange and affix new gaskets to the inner aid
half gallons of solution composed of one third muriatic
outer faces (Fig. 3.). Insert the core into the cooler
acid and two-thirds water.
The cleaning action is
evidenced by bubbling and foaming.
NOTE: The inlet and outlet openings
Watch the process carefully and, when bubbling stops
in the oil cooler core are stamped
(this usually takes from 30 to 60 seconds), remove the
"IN" and "OUT". It is very important
core from the cleaning solution and thoroughly flush it
that the core be installed in the
with clean, hot water, After cleaning, dip the core in light
correct position to prevent any
possibility of foreign particles and
sludge, which may not have been
NOTE: Do not attempt to clean an oil
removed in cleaning the fins of the
cooler core when an engine failure
core, entering and cirulating through
occurs in which metal particles from
worn or broken parts are released
into the lubricating oil. Replace the
Align the matchmarks previously placed on the
oil cooler core.
core and housing and install the oil cooler core in the oil
Pressure Check Oil Cooler Core
With the matchmarks in alignment. place the
After the oil cooler core has been cleaned, check for
oil cooler housing and core against the cylinder block.
leaks as follows:
Slide the hose and clamps in position between
Make a suitable plate and attach it to the
the cylinder block water inlet elbow and the oil cooler.
flanged side of the cooler core. Use a gasket made
Secure the clamps in place.
from rubber to assure a tight seal. Drill and tap the
plate to permit an air hose fitting to be attached at the
Place a new gasket between the fresh water
inlet side of the core (Fig. 2).
pump and the cooler housing and secure the pump to -
he cooler housing.
Attach an air hose, apply approximately 75-150
psi air pressure and submerge the oil cooler core and
Position the hose and clamps in place between
plate assembly in a container of water heated to 180 F.
the water pump and the tube to the thermostat housing.
Any leaks will be indicated by air bubbles in the water.
Secure the clamps.
If leaks are indicated, replace the core.
Install all of the accessories or equipment it was
When making this
necessary to remove.
pressure test be sure that personnel
1972 General Motors Corp.
SEC. 4.4 Page 3