FUEL SYSTEM Engines with Serial Numbers 90N1-90N6120

FUEL SYSTEM

SYSTEMS OPERATION

(90N1-90N6120)

FUEL SYSTEM

Engines with Serial Numbers 90N1-90N6120

The sleeve metering fuel system is a pressure

CAUTION: Diesel fuel is the only lubrication for

type fuel system. The name for the fuel system is

the moving parts in the 'transfer pump, injection

from the method used to control the amount of

pump housing, and the governor. The injection

fuel sent to the cylinders. This fuel system has an

pump housing must be full of fuel before turning

injection pump for each cylinder of the engine. It

the camshaft.

also has a fuel transfer pump on the front of the

injection pump housing. The governor is on the

This fuel system has governor weights, a thrust

rear of the injection pump housing.

collar and two governor springs. One governor

spring is for high idle and the other governor spring

The drive gear for the fuel transfer pump is on

is for low idle. Rotation of the shaft for governor

the front of the camshaft for the injection pumps.

control, compression of the governor springs,

The carrier for the governor weights is bolted to

movement of connecting linkage in the governor

the rear of the camshaft for the injection pumps.

and injection pump housing controls the amount

The injection pump housing has a bearing at each

of fuel sent to the engine cylinders.

end to support the camshaft. The camshaft for the

sleeve metering fuel system is driven by the timing

Fuel from fuel tank (7) is pulled by fuel transfer

gears at the front of the engine.

pump (11) through fuel filter (9). From fuel filter

(9) the fuel goes to housing for fuel injection

The injection pumps, lifters and rollers, and the

pumps (14). The fuel goes in housing (14) at the

camshaft are all inside of the pump housing. The

top and goes through inside passage (20) to fuel

pump housing and the governor housing are full of

transfer pump (11).

fuel at transfer pump pressure (fuel system pres.

sure).

SCHEMATIC OF FUEL SYSTEM

1. Return line for fuel Injection nozzles. 2. Fuel priming pump. 3. Return line for constant bleed valve. 4, Constant

bleed valve. 5. Manual bleed valve. 6. Fuel injection nozzle. 7. Fuel tank. ,8.Fuel Inlet Line. 9. Fuel filter. 10.

Bypass for fuel priming pump. 11. Fuel transfer pump. 12. Fuel bypass valve. 13. Camshaft. 14. Housing for fuel

Injection pumps. A. Check valve. 5. Check valve. C. Check valve. D. Check valve.