Land Rover Diesel Distributor Pumps Bosch Bosch Manual

Diesel
distributor fuel-injection pumps
Diesel-engine management
Technical Instruction 

Published by:
© Robert Bosch GmbH, 1999
Postfach 30 02 20,
D-70442 Stuttgart.
Automotive Equipment Business Sector,
Department for Automotive Services,
Technical Publications (KH/PDI2).
Editor-in-Chief:
Dipl.-Ing. (FH) Horst Bauer.
Editors:
Dipl.-Ing. Karl-Heinz Dietsche,
Dipl.-Ing. (BA) Jürgen Crepin,
Dipl.-Holzw. Folkhart Dinkler,
Dipl.-Ing. (FH) Anton Beer.
Author:
Dr.-Ing. Helmut Tschöke, assisted by the
responsible technical departments of 
Robert Bosch GmbH.
Presentation:
Dipl.-Ing. (FH) Ulrich...

Combustion in the diesel engine
The diesel engine 2
Diesel fuel-injection systems: 
An overview
Fields of application 4
Technical requirements 4
Injection-pump designs 6
Mechanically-controlled (governed)
axial-piston distributor fuel-injection
pumps VE
Fuel-injection systems 8
Fuel-injection techniques 9
Fuel supply and delivery 12
Mechanical engine-speed control 
(governing) 22
Injection timing 29
Add-on modules and 
shutoff devices 32
Testing and calibration 45
Nozzles and nozzle holders 46...

The diesel engine
Diesel combustion principle
The diesel engine is a compression-
ignition (CI) engine which draws in air 
and compresses it to a very high level.
With its overall efficiency figure, the diesel
engine rates as the most efficient com-
bustion engine (CE). Large, slow-running
models can have efficiency figures of as
much as 50% or even more. 
The resulting low fuel consumption,
coupled with the low level of pollutants in
the exhaust gas, all serve to underline
the diesel engine’s...

(prechamber engines and direct-injec-
tion engines respectively).
Direct-injection (DI) engines are more ef-
ficient and more economical than their
prechamber counterparts. For this rea-
son, DI engines are used in all commer-
cial-vehicles and trucks. On the other
hand, due to their lower noise level,
prechamber engines are fitted in passen-
ger cars where comfort plays a more im-
portant role than it does in the commer-
cial-vehicle sector. In addition, the
prechamber diesel engine features con-...

Fields of application
Diesel engines are characterized by their
high levels of economic efficiency. This is
of particular importance in commercial
applications. Diesel engines are em-
ployed in a wide range of different ver-
sions (Fig. 1 and Table 1), for example as: 
– The drive for mobile electric generators
(up to approx. 10 kW/cylinder),
– High-speed engines for passenger
cars and light commercial vehicles (up
to approx. 50 kW/cylinder),
– Engines for construction, agricultural,
and forestry...

creasingly being superseded by the Elec-
tronic Diesel Control (EDC). In the pas-
senger-car and commercial-vehicle sec-
tor, new diesel fuel-injection systems are
all EDC-controlled.According to the latest state-of-the-art, 
it is mainly the high-pressure injection 
systems listed below which are used for
motor-vehicle diesel engines.Fields of
application, 
Technical
requirements
5
Injected fuel 
quantity per stroke
Max. nozzle
pressure
m      
Mechanical
e    
   Electronic
em 
   Electromechanical
MV...

Injection-pump 
designs
In-line fuel-injection pumps
All in-line fuel-injection pumps have a
plunger-and-barrel assembly for each
cylinder. As the name implies, this com-
prises the pump barrel and the corre-
sponding plunger. The pump camshaft
integrated in the pump and driven by the
engine, forces the pump plunger in 
the delivery direction. The plunger is re-
turned by its spring. 
The plunger-and-barrel assemblies are
arranged in-line, and plunger lift cannot
be varied. In order to permit changes in...

for generation of the high pressure and for
fuel delivery. The injected fuel quantity is
metered by a high-pressure solenoid
valve. The timing device rotates the cam
ring in order to adjust the start of delivery.
As is the case with the solenoid-valve-
controlled axial-piston pump, all open and
closed-loop control signals are processed
in two ECU’s. Speed is controlled by
appropriate triggering of the actuator.
Single-plunger fuel-injection
pumps
PF single-plunger pumps
PF single-plunger injection pumps...

Fuel-injection
systems
Assignments
The fuel-injection system is responsible
for supplying the diesel engine with fuel.
To do so, the injection pump generates
the pressure required for fuel injection.
The fuel under pressure is forced through
the high-pressure fuel-injection tubing to
the injection nozzle which then injects it
into the combustion chamber.
The fuel-injection system (Fig. 1) in-
cludes the following components and
assemblies: The fuel tank, the fuel filter,
the fuel-supply pump, the...