DAF CF65, CF75, CF85 Series . Manual — part 444

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Inspection and adjustment

PE ENGINE FUEL SYSTEM

CF65/75/85 series

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3. INSPECTION AND ADJUSTMENT

3.1 INSPECTING FUEL LEVEL ELEMENT

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To prevent deformation of the fuel

tank, the delivery pressure in the fuel

tank must not exceed 0.4 bar.

1.

Fit a pressure reducer valve connection on a

tank cap (without bleeder) and connect the

tank cap to the fuel tank.

2.

Pressurise the fuel tank (maximum 0.1 bar).

3.

Slowly increase the pressure until the

system audibly blows off via the pressure

relief valve and check the opening pressure

of the fuel level element. See "Technical

data".

4.

De-pressurise the fuel tank and remove the

tank cap with the air connection.

Note:

To prevent dirt from entering, first clean the

exterior of the fuel tank.

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Inspection and adjustment

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CF65/75/85 series

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5.

Remove the fuel level element.

6.

Check the angular displacement of the fuel

level element and the resistor value. See

"Technical data".

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Inspection and adjustment

PE ENGINE FUEL SYSTEM

CF65/75/85 series

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3.2 INSPECTING INJECTOR OPENING PRESSURE

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Fuel or test fluid discharged by an

injector may penetrate the skin,

seriously harming your health. Make

sure the fuel jet is discharged into a

suitable container.

1.

Disconnect the earth lead from the battery

terminal.

2.

Remove the fuel injector pipes as a set and

close the connections on the pump units

immediately.

Note:

The opening pressure of the injectors can be

tested using an injector test pump

(DAF no. 0694966). The advantage of this

method is that the injectors need not be

removed from the engine.

3.

Check the opening pressure of the injectors.

Instructions for the use of the injector test
pump
1.

Before the injector test pump is used, it must

first be bled.

Remove the pump reservoir filler plug and fill

the reservoir with test fluid. The fluid level

must be approximately 1 cm below the top

rim.

2.

Tilt the pump until the line with the word

"BLEED" is horizontal.

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BLEED

PE ENGINE FUEL SYSTEM

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Inspection and adjustment

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CF65/75/85 series

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3.

Press the bleed pin (1) and simultaneously

turn the crank (2) clockwise to the stop.

During this procedure, air bubbles will come

to the surface in the reservoir. Now turn back

the crank, fill the reservoir again and repeat

the process until no more air bubbles come

to the surface.

Now release the bleed pin. Continue turning

the crank until fuel escapes on the delivery

side.

4.

If necessary, fill the fuel reservoir and screw

back the cap.

5.

The pump is now ready for use.

Inspecting opening pressure with an injector
test pump
1.

Keep the test pump more or less horizontal.

2.

Loosen the test pump filler cap by half a turn

so that air can enter the reservoir.

3.

Turn the test pump crank clockwise. The

compression will now start. Watch the fluid

level in the test pump.

4.

Carefully determine the opening pressure of

the injector. There is no harm in repeating

the test two or three times.

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If the test is repeated too often,

however, the test fluid deposited on

the piston may cause damage to the

engine when it is started.

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