TM 5-3895-359-14&P
LUBRICATING OIL PRESSURE REGULATOR
Stabilized lubricating oil pressure is maintained within
Remove Oil Pressure Regulator
the engine at all speeds, regardless of the oil
temperature, by an oil pressure regulator installed
1. Remove the two oil pump outlet pipe to regulator
between the oil pump outlet pipe and the cylinder block.
attaching bolts and lock washers.
The regulator assembly consists of a regulator body, a
2. Remove the two regulator body-to-cylinder block
hollow piston-type valve, a spring and a plug to retain
bolts and lock washers.
the valve and spring (Fig. I). A new die cast lubricating
oil pressure regulator assembly is now being using (Fig.
3. Tap the lower end of the regulator body lightly to
loosen the body from the gasket and cylinder block.
Remove the gasket.
The valve is held on its seat by the spring, which is
compressed by the plug threaded into the valve opening
Disassemble Oil Pressure Regulator
in the regulator body. The entire assembly is bolted to
the lower flange of the cylinder block and sealed against
1. Clamp the flange of the regulator body in a bench
oil leaks by a gasket between the two members. When
vise with soft jaws and remove the plug from the body.
the oil pressure at the valve exceeds 50 psi (345 kPa),
the valve is forced from its seat and oil from the engine
2. Remove the spring and valve from the regulator
oil gallery is by-passed to the oil pan.
body.
Under normal conditions, the pressure regulator should
Inspection
require very little attention. If sludge accumulates in the
lubrication system, the valve may not work freely,
Clean all of the regulator components in fuel oil and dry
thereby remaining open or failing to open at the normal
them with compressed air. Then inspect the parts for
operating pressure.
wear or damage.
Whenever the lubricating oil pump is removed for
The regulator valve must move freely in the valve body.
inspection, the regulator valve and spring should also be
If the valve or regulator body is scored and cannot be
removed, thoroughly cleaned in fuel oil and inspected.
cleaned up with crocus cloth, they must be replaced.
Fig. 1 - Lubricating Oil Pressure Regulator Details
and Relative Location of Parts.
Fig. 2 - Lubricating Oil Pressure Regulator
(Former and Current).
10-5-12
