TM 5-3810-300-24&P-3
4.1.1
LUBRICATING OIL PRESSURE REGULATOR
Stabilized lubricating oil pressure is maintained within the
3. Tap the lower end of the regulator body lightly to
engine at all speeds, regardless of the oil temperature,
loosen the body from the gasket and cylinder
by an oil pressure regulator installed between the oil
block. Remove the gasket.
pump outlet pipe and the cylinder block.
Disassemble Oil Pressure Regulator
The regulator assembly consists of a regulator body, a
hollow piston-type valve, a spring and a plug to retain the
1. Clamp the flange of the regulator body in a
valve and spring (Fig. 1).
bench vise with soft jaws and remove the plug
from the body.
The valve is held on its seat, by the spring, which is
compressed by the plug threaded into the valve opening
2. Remove the spring and valve from the regulator
in the regulator body. The entire assembly is bolted to
body.
the lower flange of the cylinder block and sealed against
oil leaks by a gasket between the two members. When
Inspection
the oil pressure at the valve exceeds 50 psi (345 kPa),
the valve is forced from its seat and oil from the engine
Clean all of the regulator components in fuel oil and dry
oil gallery is by-passed to the oil pan.
them with compressed air. Then inspect the parts for
wear or damage.
Under normal conditions, the pressure regulator should
require very little attention. If sludge accumulates in the
The regulator valve must move freely in the valve body.
lubrication system, the valve may not work freely, thereby
If the valve or regulator body is scored and cannot be
remaining open or failing to open at the normal operating
cleaned up with crocus cloth, they must be replaced.
pressure.
Replace a fractured or pitted spring.
Whenever the lubricating oil pump is removed for
inspection, the regulator valve and spring should also be
Assemble Oil Pressure Regulator
removed, thoroughly cleaned in fuel oil and inspected.
Refer to Fig. 1 and assemble the regulator as follows:
Remove Oil Pressure Regulator
1. Apply clean engine oil to the outer surface of the
1. Remove the two oil pump outlet pipe to regulator
valve and slide it into the regulator body, closed
attaching bolts and lock washers.
end first.
2. Remove the two regulator body-to-cylinder block
2. Insert the spring in the valve and, while
bolts and lock washers.
compressing the spring, start the plug into the
regulator body. Tighten the plug.
Install Oil Pressure Regulator
1. Remove all traces of the old gasket from the
regulator body, cylinder block and pump outlet
pipe flange.
2. Affix a new gasket to the regulator body with the
oil passage holes in the gasket in alignment with
the oil passages in the body and secure the
regulator to the cylinder block with two bolts.
3. Place a new gasket between the regulator and
Fig. 1. Lubricating Oil Pressure Regulator
the pump outlet pipe and connect these parts
Details and Relative Location of Parts
together with two bolts.
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