DAF CF65, Service Manual

Page: 258 / 352

XE ENGINE FUEL SYSTEM
2-10
©
200324
General
8
CF65/75/85 series
4
Pump unit
The valve (6), back plate (8) and the pump
plunger (13) are located in the top of the pump
unit.
These parts are lubricated by the fuel.
A roller (17), tappet (15) and a spring (14) with
spring retainer (16) are situated on the bottom of
the pump unit.
These parts are lubricated by the engine
lubrication system.
The lower sealing ring on the pump unit
separates the fuel system from the engine
lubrication system.
A pressure valve (5) is fitted on the top of the
pump unit.
The function of the pressure valve is to prevent
the supply section from being interrupted by
pressure peaks from the injector pipe.
The injection timing and the quantity of fuel to be
injected are controlled by a solenoid valve (9) that
consists of an electromagnet and valve (6) with
back plate (8), via the electronic unit control.
If the solenoid valve (9) is not energised, the
valve (6) is forced against the valve stop (4) by
the force of the valve spring.
This creates a very small opening between the
space above the pump plunger (13) and the
supply ducts (2).
The fuel will now flow via the fuel supply ducts (2)
to the space above the pump plunger (13).
1
15
17
3
4
6 7
8
10
2
11
12
13
14
16
9
i 400434
5
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