Fuel System - TM-9-2815-200-350051

drive adapter (SS, fig. 1-8) and the drive

c. Oil Pump. The oil pump assembly consists

coupling (RR ) located at the front of the engine.

of three sections combined as a single unit. The

b. Fuel Injection Metering Pump. The fuel in-

twin scavenge oil pump section of the unit picks

jection metering pump is located in the "V" of

up oil from the front and rear compartments of

the engine between the fan drive housings, and

the oil pan and delivers it to the main pressure

s u p p l i e s fuel under high pressure to each

pump oil compartment. The main pressure oil

cylinder. The pump is driven at engine speed

pump section picks up oil from its respective

from the fan drive housing located at the rear of

compartment and supplies oil to the engine oil

t h e engine. A fuel injector pump advance

g a l l e r i e s and bearings. The piston cooling oil

a s s e m b l y (J, fig. 1 - 8 ) is incorporated in the

pump section picks up oil from the rear sump

accessory drive housing to automatically provide

section of the oil pan and supplies oil to the

a gradual degree advance of injection timing

piston oil sprayer nozzles (a, above).

during the engine speed range from idle to 1800

d. Oil Filters and Control Valves. The main

rpm.

and auxiliary oil filters (figs. 1-3 and 1-6) and

c. Fuel Injector Nozzles and Tubes. T w e l v e

the bypass valves are located in the crankshaft

fuel injector nozzles (fig. 1-11), one per cylinder,

damper and oil filter housing at the front of the

a r e used to inject fuel into the combustion

engine. All engine oil passes through a screen

chambers, Twelve fuel injector tubes of equal

type main oil filter. Engine oil, which lubricates

l e n g t h carry the fuel from the fuel injection

the fuel injection pump and the two tur-

p u m p to the nozzles. The nozzles on each

bosuperchargers (figs. 1-1, 1-2, and 1-4), is

cylinder bank are interconnected by fuel return

further filtered by a replaceable element type

lines to provide a path for the return of excess

auxiliary oil filter. Two oil filter bypass valves

fuel.

are used, one for the main oil filter and one for

the auxiliary oil filter. The main oil filter bypass

d. Fuel Purge System. A manually operated

purge pump is provided in the vehicle operator's

valve opens at a differential pressure of 35.6 psi

c o m p a r t m e n t and is used to clear the engine

a n d the auxiliary oil filter bypass valve at a

main fuel system and flame heater system of air,

differential pressure of 15 psi. The bypass valves

a n d fill them with fuel. Purged air is forced

permit oil to bypass the filters in the event that

through the main fuel tubes into the fuel return

they become clogged.

lines and on to the vehicle fuel tanks. The fuel

1-18. Fuel System

f i l t e r s contain drain lines, with manually

a. Fuel Supply Pump Assembly. The engine

operated valves, which are used to drain the

d r i v e n vane type fuel supply pump assembly

water from the filters, and for purging the fuel

(figs. 1-3 and 1-6) is used to supply fuel under

system.

p r e s s u r e to the fuel injection pump. The fuel

p u m p is crankshaft driven by the fuel pump

1-12