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

 

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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

 

 

 

 

 

 

 

Content   ..  436  437  438  439   ..