TM 9-4940-549-14&P
ENGINE LUBRICATION SYSTEM
GENERAL. The oil system consists of an oil pump, oil filter, oil lines and
pressure regulator valve. The oil pump forces the oil under pressure
through a full-flow oil filter to the main oil header in the cylinder
block . This oil header is a drilled passage extending the length of the
cylinder block on the side opposite the camshaft and is closed at both
ends with plug. From the main header oil is distributed under con-
trolled pressure, through drilled passages to all main bearings, cam-
shaft bearings and rocker arms. Oil for lubricating the connecting rod
bearings is provided through drilled passages in the crankshaft from
the main bearings. The cylinder walls, piston pins and valve tappets
are lubricated by oil drain back and by the mist of oil thrown from the
various pressure lubricated bearings. The gear train is lubricated by
overflow oil from the camshaft. An external opening is provided for
the connection of the oil pressure transmitter.
OIL FILTER ASSEMBLY.
a.
Removal (Refer to figure 10-1).
(1) Remove drain plug (23) and allow the oil to drain into a suit-
able container.
(2) Disconnect hose assemblies (24) and (25) from the filter assem-
bly (10).
(3) Remove four nuts (2), lockwashers (3), flat washers (5), and
cap screws (4) to remove oil filter clamp (14) from bracket.
(4) Do not remove bracket (8) unless inspection reveals damage.
(5) Remove the two elbows (1) from the filter housing.
(6) Remove square nut (11), flat washer (13) and screw (12), to
remove clamp (14 ) from filter assembly (10).
(7) Refer to figure 10-1 and disassemble the oil filter assembly.
b.
Cleaning and Inspection.
(1) Clean oil filter assembly parts with dry-cleaning solvent.
(2) Inspect mounting bracket for cracks, corrosion, and other dam-
age.
(3) Inspect oil line assemblies for clogging, deterioration, or other
damage.
(4) Check all threads for stripping or other damage.
(5) Replace any defective parts.
