TM 5-3810-300-24&P-3
4.4
OIL COOLER
In order to perform its functions satisfactorily, the
Remove Oil Cooler
lubricating oil must be kept within the proper temperature
limits. If the oil is too cold, it will not flow freely. If the oil
1. Drain cooling system by opening the drain cock
is too hot, it cannot support the bearing loads, it cannot
(Fig. 1) at the bottom of the oil cooler housing.
carry away enough heat, and it may result in too great an
oil flow. As a consequence, oil pressure may drop below
2. Remove the bolts and lock washers that attach
acceptable limits and oil consumption may become
the water inlet connector to the oil cooler
excessive.
housing.
In performing its lubricating and cooling functions, the oil
3. Loosen the clamp, breaking the connection
absorbs a considerable amount of heat and this heat
between the water pump and oil cooler housing.
must be dissipated by an oil cooler.
4. Remove the bolts attaching the oil cooler
The oil cooler is located on the side of the engine just
housing to the adapter, and remove the housing
below the water pump (Fig. 1).
and element as an assembly. Be careful when
withdrawing the assembly not to drop or damage
To assure proper lubrication, if the oil cooler core
the cooler core.
becomes clogged, a valve located between the oil inlet
and the element, by-passes the oil around the cooler
5. If the adapter is to be removed, remove the bolts
directly to the oil gallery in the cylinder block.
that hold the adapter to the cylinder block and
remove the adapter and gaskets. Do not lose
The by-pass valve, spring, plug and gasket are housed in
the copper washer off lowest bolt.
the oil cooler adapter (Fig. 1).
6. Remove all traces of gasket material from the
The by-pass valve should be removed, cleaned, and
cylinder block and the oil cooler components.
reassembled whenever the cooler element is cleaned or
replaced. However, if required, the by-pass valve can be
removed without removing oil cooler.
Remove By-Pass Valve
Remove the plug and lift the gasket, valve and spring
from the adapter (Fig. 1).
Inspection
Clean the by-pass valve components with fuel oil and dry
them with compressed air.
Inspect the valve and spring for wear or damage and
replace them if necessary.
Install By-Pass Valve
1. Apply clean engine oil to the outside surface of
the by-pass valve and place the valve in the
adapter, closed end first.
2. Slide the valve spring into the valve and screw
the plug with gasket, into the adapter.
Fig. 1. Typical Lubricating Oil Cooler Mounting
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