FUNCTION OF FUEL JUNCTION BLOCK

FUEL SYSTEM

SYSTEMS OPERATION

(75V1-UP, 90N6121-UP)

to the cylinder, the force made by the pressure of

the fuel in the nozzle body will become less. The

force of the spring will then be more than the force

of the pressure of the fuel in the nozzle body.

Valve (8) will move to the closed position.

Valve. (8) is a close fit with the inside of nozzle

tip (13), this makes a positive seal for the valve.

When the fuel is sent to the cylinder, a very

small quantity of fuel will leak by the valve guide.

This fuel gives lubrication to the moving parts of

the fuel injection nozzle.

FUNCTION OF FUEL JUNCTION BLOCK

The location of the fuel junction block (4) is at

the right rear of the engine. The fuel lines from the

fuel tank and the engine connect at fuel junction

block (4).

AUTOMATIC TIMING ADVANCE UNIT

1. Gear on camshaft for fuel injection pump. 2. Automatic

timing advance unit. 3. Camshaft for the engine.

angle between the timing advance gear and the two

drive dowels in the drive gear for the engine cam-

shaft. Since the timing advance unit drives the gear

(I) on the camshaft for the fuel injection pump,

the fuel injection timing is also changed.

CONNECTIONS FOR FUEL LINES AT THE

FUEL JUNCTION BLOCK

1. Connection for constant bleed line to housing for fuel

injection pumps. 2. Connection for constant bleed line to

fuel tank. 3. Connection for fuel supply line to fuel filter.

4. Fuel junction block. 5. Connection for fuel supply

line to fuel tank.

AUTOMATIC TIMING ADVANCE UNIT

The automatic timing advance unit (2) is in-

stalled on the front of the camshaft (3) for the

engine. The automatic timing advance unit (2)

AUTOMATIC TIMING ADVANCE UNIT

drive the gear (1) on the camshaft for the fuel

injection pump. This gear is the drive for the cam-

4. Weights. 5. Springs. 6. Slides.

shaft for the fuel injection pump.

The automatic timing advance unit will change

The weights (4) in the timing advance are driven

the timing 5 degrees. This change starts at approxi-

by two slides (6) that fit into notches made on an

mately low idle rpm and is operating up through

angle in the weights. The slides (6) are driven by

the rated speed of the engine. No adjustment can

two dowels which are in the drive gear for the

be made to the automatic timing advance unit.

engine camshaft. As centrifugal force (rotation)

moves weights (4) outward against the force of

Lubrication oil for the timing advance unit

springs (5), the movement of the notches in weights

comes from drilled holes that connect with the

(4) will cause the slides to make a change in the

front bearing for the engine camshaft.