DAF CF65, CF75, CF85 Series . Manual — part 438

©

200416

1-1

Safety instructions

CE ENGINE, ENGINE BRAKE

ΧΦ65/75/85 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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CE ENGINE, ENGINE BRAKE

1-2

©

200416

Safety instructions

4

ΧΦ65/75/85 series

4

©

200416

2-1

General

CE ENGINE, ENGINE BRAKE

ΧΦ65/75/85 series

4

4

2. GENERAL

2.1 LOCATION OF EXHAUST BRAKE COMPONENTS

1.

Supply pressure

2.

Exhaust brake valve

3.

Operating cylinder, exhaust brake

4.

Butterfly valve

I400868

4

2

3

1

CE ENGINE, ENGINE BRAKE

2-2

©

200416

General

4

ΧΦ65/75/85 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 in the cab floor and an
operating cylinder (3) connected to the butterfly
valve (4) in the exhaust pipe.
If the engine brake operating switch is activated,
a signal is passed to the engine management
system's electronic unit. The engine
management system's electronic unit interrupts
the fuel supply to the various cylinders. The unit
also energises the exhaust brake valve (2),
causing supply pressure to flow to the operating
cylinder. This cylinder closes the butterfly valve in
the butterfly valve housing. The exhaust pipe is
then almost completely closed off.
The engine now acts as a compressor, creating a
braking action.
The higher the engine speed, the greater the
braking action of the exhaust brake.

Switching off the exhaust brake
If the engine brake operating switch is released,
the butterfly valve will be re-opened and the fuel
supply to the various cylinders will be re-instated.

I400868

4

2

3

1

1.

Supply pressure

2.

Exhaust brake valve

3.

Butterfly valve operating cylinder

4.

Butterfly valve