4.4
DETROIT DIESEL 53
LUBRICATING OIL COOLER
pump through a passage in the oil cooler adaptor to
Engine oil coolers are provided for all engine.
the full flow oil filter, which is also mounted on the oil
cooler adaptor, and then through the oil cooler core
The oil cooler is
and the cylinder block oil galleries.
mounted on the side of the cylinder block at the lower
front corner.
To Assure engine lubrication should the oil cooler
become plugged. a by-pass valve located near the top
of the lower engine front cover by-passes oil from the
oil pump discharge port directly to the oil galleries in
Remove Oil Cooler Core
the cylinder block The by-pass valve opens at
approximately 52 psi (current In-line engines).
1. Drain the cooling system by opening the drain cock
at the bottom of the oil cooler housing.
The valve components are the same as and serviced in
the same manner as the oil pressure regulator valve in
2. Remove any accessories or other equipment
Section 4.1.1.
necessary to provide access to the cooler.
engines, loosen and slide the
3. On In-Line
clamps and hose back on the water inlet elbow on the
cylinder block.
Cooling water circulated through the oil cooler
completely surrounds the oil cooler core. Therefore,
4. Loosen and slide the clamps and hose back on the
whenever an oil cooler is assembled, special care must
tube leading from the thermostat to the water pump.
be taken to have the proper gaskets in place and the
retaining bolts tight to assure good sealing.
5. Remove the bolts and lock washers which attach the
water pump to the oil cooler housing.
The oil cooler housing on an In-line engine is attached
to an oil cooler adaptor which. in turn. is attached to
6. Matchmark the end of the oil cooler housing. cooler
the cylinder block. The flow of oil is from the oil
core and adaptor with a punch or file so they can be
reinstalled in the same position.
7. Remove the bolts and lock washers which attach the
oil cooler housing to the adaptor or cylinder block and
remove the housing and core as an assembly. Be
careful when withdrawing the assembly not to drop or
damage the cooler core
Fig. 1 - Typical oil Cooler Mounting (6V-53
Fig. 2 - Preparing Oil Cooler Core for Pressure
Engine Shown)
Test
SEC. 4.4 Page 1
July, 1972
