DAF LF45, LF55 Series. Manual — part 307
©
200416
1-1
Safety instructions
ENGINE BRAKE, BE ENGINE
ΛΦ45/55 series
4
4
1. SAFETY INSTRUCTIONS
1.1 SAFETY INSTRUCTIONS
Fuel
Diesel fuel is an extremely
flammable liquid, and must not be
exposed to naked flames or come
into contact with hot surfaces. The
diesel fuel fumes remaining in an
empty fuel tank form an extremely
explosive mixture.
When fuel system components are being
removed, some fuel will escape.
To keep this spillage to a minimum, unscrew the
tank cap to release any overpressure.
Any spilled fuel must be collected, bearing in
mind the risk of fire.
Exhaust gases
Do not run the engine in an enclosed or
unventilated area.
Make sure exhaust fumes are properly extracted.
Exhaust gases contain carbon
monoxide.
Carbon monoxide is a deadly
colourless and odourless gas,
which, when inhaled, deprives the
body of oxygen, leading to
asphyxiation. Serious carbon
monoxide poisoning may result in
brain damage or death.
Moving parts
Remain at a safe distance from rotating and/or
moving components.
Various fluids
Various oils and lubricants used on the vehicle
may constitute a health hazard.
This also applies to engine coolant, windscreen
washer fluid, refrigerant in air-conditioning
systems, battery acid and clutch fluid.
So avoid inhaling and direct contact.
Electrical short-circuit
Always disconnect the battery's earth connection
during repair or maintenance operations for
which the electric power supply is not required.
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ENGINE BRAKE, BE ENGINE
1-2
©
200416
Safety instructions
4
ΛΦ45/55 series
4
©
200416
2-1
General
ENGINE BRAKE, BE ENGINE
ΛΦ45/55 series
4
4
2. GENERAL
2.1 LOCATION OF EXHAUST BRAKE COMPONENTS
1.
Exhaust brake valve
2.
Air pipe
3.
Operating cylinder, exhaust brake
4.
Butterfly valve
1
3
4
2
i400858
ENGINE BRAKE, BE ENGINE
2-2
©
200416
General
4
ΛΦ45/55 series
4
2.2 SYSTEM DESCRIPTION, EXHAUST BRAKE
Note:
The engine brake is an exhaust brake.
Switching on the exhaust brake
The exhaust brake consists of an engine brake
operating switch fitted to the steering column and
an operating cylinder (3) connected to the
butterfly valve (4) in the exhaust pipe.
If the exhaust brake operating switch is activated,
a signal is passed to the engine management
system's electronic unit. The operating switch
has the positions "off" and "automatic". In the
"automatic" position the engine management
system's electronic unit engages the exhaust
brake whenever this is appropriate and possible.
Of course, the electronic unit disengages the
exhaust brake when required.
If the exhaust brake is engaged by the electronic
unit, the unit energises the exhaust brake valve
(1), causing supply pressure to flow to the
operating cylinder. The cylinder closes the
butterfly valve in the butterfly valve housing. The
exhaust pipe is then almost completely closed off.
The engine management system's electronic unit
also interrupts the fuel supply to the various
cylinders. The engine now acts as a compressor,
creating a braking action.
The higher the engine speed, the greater the
braking action of the engine brake.
Switching off the exhaust brake
If the engine brake control switch is pushed back,
the butterfly valve will be re-opened and the fuel
supply to the various cylinders will be re-instated.
1
3
4
2
i400858
1.
Exhaust brake valve
2.
Air pipe
3.
Butterfly valve operating cylinder
4.
Butterfly valve
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