Injection Pump Housing

TM 9-2910-226-34

quill shaft assembly during disassembly. A timing

arrangement. The camshaft also includes gearing for

window in the upper part of the housing covers the

the distribution function. The fuel injection pump

marked plunger gear, which is used for timing

contains a single-plunger, multioutlet hydraulic

during assembly and disassembly. A timing pointer

head assembly and is designed to be driven at

crankshaft speed on four-cycle engines.

(D, fig. 1-14) at front of fuel injection pump, alines

with a mark on timing device hub (C, fig. 1-14) to

b. The purpose of the fuel injection pump is to

deliver accurately metered quantities of fuel under

show port closing position.

high pressure to the spray nozzle for injection into

KEY to fig. 1-13

the engine cylinders.

An integral mechanical-centrifugal type

Typical Injection Pump

governor controls fuel delivery as a function of

Code 13, C, D, E, F, G

engine speed. It is driven directly from the rear of

Overflow valve assembly

Fuel control unit assembly

the pump camshaft without gearing.

Fuel control rod

d. The fuel supply pump is the positive

Fuel shutoff rod assembly

displacement type. It is gear driven by the metering

Timing window cover solenoid shutoff assembly.

and distributing fuel injection pump camshaft. It

Quill shaft pad cover

provides fuel to the hydraulic head for injection and

Camshaft driven gear

Shaft spacer

cooling, and fuel to the engine flame heater system.

Quill shaft retaining screw

e. The timing device is the mechanical-centrifugal

Quill shaft bushing

type. It is driven clockwise by the engine camshaft

Quill shaft

at crankshaft speed.

Plunger sleeve pin

f. The fuel density compensator (when used) is

Plunger sleeve

mounted on the governor housing. The fuel density

Injection Pump

compensator automatically varies the quantity of

Code A

fuel delivered to the engine so that the maximum

Overflow valve assembly

power output of the engine remains constant

Fuel control unit assembly

Fuel control rod

regardless of the type of fuel being used.

Fuel shutoff solenoid

1-6. Injection Pump Housing. a. The aluminum

Timing window cover solenoid shutoff assembly.

housing is cast with an integral three-hole flange for

Quill shaft pad cover

mounting the advance unit. It has several drilled

Camshaft driven gear

Shaft spacer

holes that interconnect to form passages for the flow

Quill shaft retaining screw

of lubricating oil supplied to the fuel injection pump

Quill shaft bushing

from the engine.

Quill shaft assembly

b. A quill shaft pad cover (F, fig. 1-13) on the

Plunger sleeve pin

Plunger sleeve

bottom of the housing provides for removal of the

1-14