DAF CF65, CF75, CF85 Series . Manual - part 233

 

  Index      DAF     DAF CF65, CF75, CF85 Series - service repair manual

 

Search            

 

 

 

 

 

 

 

 

 

Content   ..  231  232  233  234   ..

 

 

DAF CF65, CF75, CF85 Series . Manual - part 233

 

 

©

 200324

3-1

Description of components

PE ENGINE COOLING SYSTEM

CF65/75/85 series

2

6

3. DESCRIPTION OF COMPONENTS

3.1 PRESSURE CAP

The pressure cap is fitted to the header tank by 

means of a threaded connection.

The pressure cap has two valves: a pressure 

relief valve (1) and a vacuum relief valve (2).

Overpressure
As a result of the rising coolant temperature, the 

pressure in the cooling system will increase. If the 

pressure in the cooling system becomes too high, 

the pressure relief valve (1) will open against the 

pressure of the spring.

Underpressure
If the coolant temperature drops, the pressure in 

the cooling system will decrease. If the pressure 

in the cooling system becomes too low, the 

vacuum relief valve (2) will be opened.

2

1

A

B

M201036

PE ENGINE COOLING SYSTEM

3-2

©

 200324

Description of components

6

CF65/75/85 series

2

3.2 DESCRIPTION OF THERMOSTAT

Operation, thermostat
The coolant enters the thermostat housing 

directly from the coolant collector pipe at the back 

and flows through the thermostat. Depending on 

the coolant temperature and the corresponding 

position of the thermostat, there are three 

possibilities:

Thermostat closed

The coolant has not yet reached the thermostat 

opening temperature.

The supply channel (B) to the radiator is 

completely closed.

The coolant flows directly to the coolant pump 

through a bypass (A) and the coolant pump 

returns the coolant to the cylinder block.

B

M200739

A

©

 200324

3-3

Description of components

PE ENGINE COOLING SYSTEM

CF65/75/85 series

2

6

Thermostat starts opening

The coolant has reached the thermostat opening 

temperature.

The supply channel (B) to the radiator is opened 

and the bypass (A) is partially closed.

Now coolant will flow both through the supply 

channel (B) to the radiator and through the 

bypass (A) directly to the coolant pump.

Thermostat fully opened

The temperature of the coolant has further 

increased. The supply channel (B) to the radiator 

is fully opened and the bypass channel (A) is fully 

closed.

The entire coolant circulation now flows via the 

supply channel (B) to the radiator where it is 

cooled before flowing back to the coolant pump.

In the event of excessive coolant temperatures, 

removing the thermostat as an emergency 

solution is not permitted.

If the thermostat is removed from the engine, 

uncooled coolant will flow to the coolant pump 

through the bypass (A). As a result, the coolant 

temperature will continue to rise.

B

M200740

A

B

M200741

A

PE ENGINE COOLING SYSTEM

3-4

©

 200324

Description of components

6

CF65/75/85 series

2

3.3 COOLANT FILTER

The task of the coolant filter is to filter the coolant 

to prevent cavitation. The coolant filter is 

necessary when the cooling system is filled with 

low-quality coolant.

 

 

 

 

 

 

 

Content   ..  231  232  233  234   ..