DAF CF65, CF75, CF85 Series . Manual — part 467

©

200324

3-7

Inspection and adjustment

XE ENGINE FUEL SYSTEM

CF65/75/85 series

4

8

7.

Remove the valve covers.

8.

Re-pressurise the system (maximum 0.2

bar).

9.

Check the permeable seal and the side-

connection of the injectors for leaks.

Note:

Engine oil may be used to detect leaks at the

O-ring.

10. Fit the valve covers.

11. Replace the normal banjo bolt with a banjo

bolt with integrated non-return valve.

I 400332

XE ENGINE FUEL SYSTEM

3-8

©

200324

Inspection and adjustment

8

CF65/75/85 series

4

3.5 BLEEDING THE FUEL SYSTEM

}

While bleeding the fuel system, fuel

will escape. Collect the fuel to avoid

the risk of fire.

}

Dirt in the fuel system can lead to

significant damage to pump units

and housing.

Note:

The fuel system has to be bled if it has been

opened; this can be done in two ways.

-

With the fuel lift pump

-

By pressurising the fuel tank

Bleeding using the fuel lift pump
1.

Loosen the union nut on the injector.

2.

Pump fuel out of the injector pipe with the

primer pump until no more air bubbles are

visible in the fuel.

3.

Tighten the union nut to the specified torque,

see "Technical data".

4.

Repeat points 1, 2 and 3 for the other

injectors.

i 400237

©

200324

3-9

Inspection and adjustment

XE ENGINE FUEL SYSTEM

CF65/75/85 series

4

8

Bleeding by pressurising the fuel tank

}

To prevent deformation of the fuel

tank, the delivery pressure in the fuel

tank must not exceed 0.4 bar.

1.

Remove the fuel tank cap and replace it by a

cap with an adjustable air connection.

Note:

Use a cap (without a vent) that has a

connection for a pressure reducer valve.

2.

Pressurise the tank to a maximum of 0.2 bar.

3.

Loosen the union nut on the injector.

4.

Tighten the union nut to the specified torque,

see "Technical data".

5.

Repeat points 1, 2 and 3 for the other

injectors.

i400600

1

3

0

4

2

i 400237

XE ENGINE FUEL SYSTEM

3-10

©

200324

Inspection and adjustment

8

CF65/75/85 series

4

3.6 INSPECTION, GALLERY PRESSURE

}

When inspecting the gallery

pressure, fuel will escape. Collect

this fuel, bearing in mind the risk of

fire.

}

Dirt in the fuel system can lead to

significant damage to pump units

and housing.

1.

Remove the plug (1) from the fuel fine filter or

from the pump housing.

2.

Connect an attenuated liquid pressure

gauge with a range of 0 - 10 bar to the free

connection point.

Note:

Before inspecting the gallery pressure at the

starting speed, the fuses of the UPEC engine

management system must be removed from

the central box before and after ignition to

stop the engine running and avoid fault

messages.

3.

Then check the gallery pressure at idling

speed, full load and starting speed and

compare the measured values to the

specified values. See "Technical data".

4.

Remove the pressure gauge and fit the

plug (1).

5.

Bleed the fuel system.

i400528

1

1

I4 00 672