Land Rover Diesel Distributor Pumps Bosch Bosch Manual

Types
The increasing demands placed upon
the diesel fuel-injection system made it
necessary to continually develop and
improve the fuel-injection pump.
Following systems comply with the
present state-of-the-art:
– In-line fuel-injection pump (PE) with
mechanical (flyweight) governor or
Electronic Diesel Control (EDC) and, if
required, attached timing device, 
– Control-sleeve in-line fuel-injection
pump (PE), with Electronic Diesel
Control (EDC) and infinitely variable
start of delivery (without...

Subassemblies
In contrast to the in-line injection pump,
the VE distributor pump has only one
pump cylinder and one plunger, even for
multi-cylinder engines. The fuel deliv-
ered by the pump plunger is apportioned
by a distributor groove to the outlet ports
as determined by the engine’s number of
cylinders. The distributor pump’s closed
housing contains the following functional
groups:
– High-pressure pump with distributor,
– Mechanical (flyweight) governor,
– Hydraulic timing device, 
– Vane-type...

holders. If the distributor pump is also
equipped with a mechanical fuel shutoff
device this is mounted in the governor
cover.
The governor assembly comprising the
flyweights and the control sleeve is 
driven by the drive shaft (gear with 
rubber damper) via a gear pair. The 
governor linkage mechanism which
consists of the control, starting, and
tensioning levers, can pivot in the
housing.
The governor shifts the position of the
control collar on the pump plunger. On
the governor mechanism’s top side is...

Pump drive
The distributor injection pump is driven
by the diesel engine through a special
drive unit. For 4-stroke engines, the
pump is driven at exactly half the engine
crankshaft speed, in other words 
at camshaft speed. The VE pump must
be positively driven so that it’s drive 
shaft is synchronized to the engine’s 
piston movement. 
This positive drive is implemented by
means of either toothed belts, pinion,
gear wheel or chain. Distributor pumps
are available for clockwise and for 
counter-clockwise...

interior pressure then increases in
proportion to the speed (in other words,
the higher the pump speed the higher 
the pump interior pressure). Some of the
fuel flows through the pressure-
regulating valve and returns to the
suction side. Some fuel also flows
through the overflow restriction and 
back to the fuel tank in order to pro-
vide cooling and self-venting for the
injection pump (Fig. 2). An overflow valve
can be fitted instead of the overflow
restriction.
Fuel-line configuration
For the...

cornering, and when standing or driving
on an incline. The fuel tank and the
engine must be so far apart from each
other that in case of an accident there is
no danger of fire. In addition, special
regulations concerning the height of the
fuel tank and its protective shielding
apply to vehicles with open cabins, as
well as to tractors and buses
Fuel lines
As an alternative to steel pipes, flame-
inhibiting, steel-braid-armored flexible
fuel lines can be used for the low-
pressure stage. These must be...

contaminants in the fuel can lead to
malfunctions, and inefficient filtering can
cause damage to the pump com-
ponents, delivery valves, and injector 
nozzles. This means that a fuel filter 
specifically aligned to the requirements
of the fuel-injection system is absolutely
imperative if trouble-free operation and 
a long service life are to be achieved.
Fuel can contain water in bound form
(emulsion) or unbound form (e.g.,
condensation due to temperature
changes). If this water gets into the
injection...

The spring’s initial tension can be
adjusted to set the valve opening
pressure.
Overflow restriction
The overflow restriction (Figure 6) is 
screwed into the injection pump’s 
governor cover and connected to the
pump’s interior. It permits a variable 
amount of fuel to return to the fuel tank
through a narrow passage. For this 
fuel, the restriction represents a flow 
resistance that assists in maintaining 
the pressure inside the injection pump.
Being as inside the pump a precisely 
defined pressure is...

plate by a pin. The distributor plunger 
is forced upwards to its TDC position 
by the cams on the cam plate, and the
two symmetrically arranged plunger-
return springs force it back down again to
its BDC position. 
The plunger-return springs abut at one
end against the distributor head and at
the other their force is directed to the
plunger through a link element. These
springs also prevent the cam plate
jumping off the rollers during harsh
acceleration. The lengths of the return
springs are carefully...

Distributor head
The distributor plunger, the distributor-
head bushing and the control collar are
so precisely fitted (lapped) into the 
distributor head (Fig. 8), that they seal
even at very high pressures. Small
leakage losses are nevertheless un-
avoidable, as well as being desirable for
plunger lubrication. For this reason, the
distributor head is only to be replaced 
as a complete assembly, and never the
plunger, control collar, or distributor
flange alone.
Fuel metering
The fuel delivery from a...