DETRIOT DIESEL 53
Engine oil coolers are provided for all engines. The oil cooler is 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 the cylinder
block. The by-pass valve opens at approximately 52 psi (current In-line engines). The valve components are the same
as and serviced in the same manner as the oil pressure regulator valve in Section 4.1.1.
Cooling water circulated through the oil cooler completely surrounds the oil cooler core. Therefore, whenever an oil
cooler is assembled, special care must be taken to have the proper gaskets in place and the retaining bolts tight to
assure good sealing. The oil cooler housing on an In-line engine is attached to an oil cooler adaptor which, in turn, is
attached to the cylinder block. The flow of oil is from the oil pump through a passage in the oil cooler adaptor to the full
flow oil filter, which is also mounted on the oil cooler adaptor, and then through the oil cooler core and the cylinder block
Remove Oil Cooler Core
Drain the cooling system by opening the drain cock at the bottom of the oil cooler housing.
2. Remove any accessories or other equipment necessary to provide access to the cooler.
3. On In-Line engines, loosen and slide the clamps and hose back on the water inlet elbow on the cylinder block.
4. Loosen and slide the clamps and hose back on the tube leading from the thermostat to the water pump.
5. Remove the bolts and lock washers which attach the water pump to the oil cooler housing.
6. Matchmark the end of the oil cooler housing, cooler 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. 3. Preparing Oil Cooler Core for
4.4 Page 1