TM 5-3810-300-24&P-3
4.1
OIL PUMP
The gear type oil pump shown in Figs. 1 and 2 is
An inlet pipe (19), attached to the inlet opening in the
mounted on the first and second main bearing caps and
pump body, leads to the inlet screen (2) which is
is gear driven from the front end of the crankshaft.
mounted with brackets to a main bearing cap.
The oil pump helical gears rotate inside a housing (Fig.
The inlet screen is located below the oil in the pan and
1). The drive gear (23) is keyed to the drive shaft which
serves to strain out any foreign material which might
is supported inside the housing on two bushings with a
damage the pump.
drive-driven gear keyed to the outer end of the shaft.
The driven gear (24) is supported on the driven gear
The oil pump inlet screen should be removed and
shaft which is pressed into the pump body.
cleaned periodically in addition to the cleaning it receives
each time the engine is reconditioned.
An integral plunger-type relief valve (4) by-passes
excess oil to the inlet side of the pump when the
When required certain engines are equipped with a duel
pressure in the oil lines exceeds 105 pounds per square
type pump which incorporates a scavenging
inch.
Fig. 1. Oil Pump Assembly
3.
Body--Oil Pump
23.
Gear--Drive
51.
Gear Cavity (Intake
56.
Gear--Idler
4.
Valve--Oil Pressure
24.
Shaft--Driven Gear
Side)
82.
Support--Idler
Relief
25.
Bushing
52.
Oil Passage (Gear
Gear
13.
Shaft--Drive
30.
Spring--Relief Valve
Cavity to
83.
Bolt--Idler
14.
Woodruff Key
36.
Copper Gasket
Pump Outlet)
Gear-to-Support
20.
Bushing--Drive Shaft
37.
Plug--Relief Valve
53.
Oil Passage (By-pass
84.
Lock Washer
(Short)
49.
Gear--Drive-Driven
to Intake
85.
Thrust Washer--Idler
21.
Cover--Pump
50.
Bushing--Drive Shaft
Side of
Gear-to-Support Bolt
22.
Gear--Driven
(Long)
Gear Cavity)
86.
Bolt--Support-to-Pump
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