TM 9-2910-226-34 arrangement. The camshaft also includes gearing for the distribution function. The fuel injection pump contains a single-plunger, multioutlet hydraulic head assembly and is designed to be driven at crankshaft speed on four-cycle engines. b. The purpose of the fuel injection pump is to deliver accurately metered quantities of fuel under high pressure to the spray nozzle for injection into the engine cylinders. c. An integral mechanical-centrifugal type governor controls fuel delivery as a function of engine speed. It is driven directly from the rear of the pump camshaft without gearing. d. The fuel supply pump is the positive displacement type. It is gear driven by the metering and distributing fuel injection pump camshaft. It provides fuel to the hydraulic head for injection and cooling, and fuel to the engine flame heater system. e. The timing device is the mechanical-centrifugal type. It is driven clockwise by the engine camshaft at crankshaft speed. f. The fuel density compensator (when used) is mounted on the governor housing. The fuel density compensator automatically varies the quantity of fuel delivered to the engine so that the maximum power output of the engine remains constant regardless of the type of fuel being used. 1-6. Injection Pump Housing. a. The aluminum housing is cast with an integral three-hole flange for mounting the advance unit. It has several drilled holes that interconnect to form passages for the flow of lubricating oil supplied to the fuel injection pump from the engine. b. A quill shaft pad cover (F, fig. 1-13) on the bottom of the housing provides for removal of the quill shaft assembly during disassembly. A timing window in the upper part of the housing covers the marked plunger gear, which is used for timing during assembly and disassembly. A timing pointer (D, fig. 1-14) at front of fuel injection pump, alines with a mark on timing device hub (C, fig. 1-14) to show port closing position. F A B C D E G H J K L M N A B C D E G H K L M N KEY to fig. 1-13 Typical Injection Pump Code 13, C, D, E, F, G Overflow valve assembly Fuel control unit assembly Fuel control rod Fuel shutoff rod assembly Timing window cover solenoid shutoff assembly. Quill shaft pad cover Camshaft driven gear Shaft spacer Quill shaft retaining screw Quill shaft bushing Quill shaft Plunger sleeve pin Plunger sleeve Injection Pump Code A Overflow valve assembly Fuel control unit assembly Fuel control rod Fuel shutoff solenoid Timing window cover solenoid shutoff assembly. Quill shaft pad cover Camshaft driven gear Shaft spacer Quill shaft retaining screw Quill shaft bushing Quill shaft assembly Plunger sleeve pin Plunger sleeve F J 1-14