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 TM 55-1905-220-14-4
3-37. LUBRICATING OIL PRESSURE REGULATOR - MAINTENANCE INSTRUCTIONS.
a. Stabilized lubricating oil pressure is maintained within the engine at all speeds, regardless of oil
temperature, by means of a pressure regulator valve. The valve is installed at the end of the vertical oil gallery
near the front of the cylinder block on the opposite side of the oil cooler.
b. The oil pressure regulator consists of a valve body, a hollow piston-type valve, a spring, a spring seat,
and a pin to retain the valve assembly within the valve body.
c. The valve is held on its seat by the spring, which is compressed by the pin in back of the spring seat.
The entire assembly is bolted to the lower flange of the cylinder block and sealed against leaks by a gasket
between the block and the valve housing. When oil pressure at the valve exceeds 50 psi (344.8 kPa) the valve
is forced from its seat and oil from the engine gallery is by-passed to the engine oil pan. This keeps oil
pressure stabilized at all times.
d. Under normal conditions, the oil pressure regulator should require very little attention. If sludge has
accumulated in the lubricating system, the valve may not work freely and may remain open, or fail to open at
the normal operating pressure. Whenever the lubricating oil pump is removed for inspection, the regulator
valve and spring should also be removed, inspected and cleaned in fuel oil.
This task covers:
a. Inspection
b. Removal
c. Installation
INITIAL SETUP :
Test Equipment
References
NONE
NONE
Equipment
Special Tools
Description
Condition Description
NONE
Oil Pan Removal
Material/Parts
Special Environmental Conditions
Gasket kit P/N 5196375
NONE
Personnel Required
General Safety Instructions
1
NONE
3-791
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