TM 5-5420-202 -20-1
SYSTEMS OPERATION - Continued
ENGINE LUBRICATION SUBSYSTEM. Forced feed system, drawing oil from oil pan. Oil is
forced through engine oil coolers and oil filter to engine oil galleries, bearings, turbosuper-
chargers, fuel injection pump, and piston cooling spray jets. A pressure relief valve returns
incoming excess unfiltered oil to oil pan. Oil filter and oil cooler bypass valves permit oil to
bypass filters if clogged. Engine and transmission oil cooling is accomplished by external oil
coolers on sides of engine. Bypass valves in each cooler control oil temperature.
(A)
OIL
COOLER
(B)
OIL
FILTER
(C)
OIL
COOLER BYPASS VALVE
(D)
OIL
FILTER BYPASS VALVE
TA249773
2-3
