TM-9-2350-275-BD
M113 FAMILY CARRIER, PERSONNEL SELF-PROPELLED FULL-TRACKED
TECHNICAL MANUAL; OPERATORS, ORGANIZATIONAL, DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE; BATTLEFIELD DAMAGE ASSESSMENT AND REPAIR
TM-9-2350-275-BD - Page 49 of 223
3-7
Figure 3-3.
TM 9-2350-275-BD
ENGINE
SECTION V. Engine Lubrication System
3-8. General.
The lubrication system consists of an oil intake screen and tube assembly, oil pump,
pressure regulator, oil filter, bypass valve, and oil cooler. The rotor type oil pump is
bolted to the back of the engine lower front cover and is driven directly by the
crankshaft. Lubricating oil is picked up from the oil pan by the pump. From the pump,
it passes from the lower front cover through short gallery passages in the cylinder block
to the oil filter adapter plate. From the adapter plate, oil flows through the oil filter,
and then through the oil cooler, and back into the front engine cover and cylinder block
oil galleries for distribution to the various engine bearings. The drain from the cylinder
head and other engine parts leads back to the oil pan. Clean engine oil is assured by a
replaceable element filter. Should the filter become clogged, oil will flow through a
bypass valve in the adapter plate directly to the oil cooler. If the oil cooler becomes
clogged, oil will flow directly through a bypass valve in the lower cover to the cylinder
block oil galleries. Stabilized oil pressure is maintained at all engine speeds by a
regulator valve located in the lower front cover.
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