DAF LF45, LF55 Series. Manual - part 293

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Removal and installation

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5. REMOVAL AND INSTALLATION

5.1 REMOVAL AND INSTALLATION, INJECTOR PIPE

Never bend injector pipes as they 

may kink or crack. 

The injector pipes form part of the 

high-pressure section of the fuel 

system. When the unions are 

unscrewed, fuel under high pressure 

may escape. Take measures to 

prevent fire and injury. Collect the 

escaping fuel in a suitable container.

Dirt in the fuel system can lead to 

significant damage to parts of the 

system. Prevent this by cleaning the 

parts before disassembly and then 

sealing all open connections.

Note:

Codes (1) are stamped in the injector pipe unions 

to enable correct positioning. The first figure is 

the number of cylinders of the engine followed by 

the fitting position.

Removing the injector pipe
1.

Clean the area surrounding the unions, both 

near the injectors and near the fuel rail.

2.

Remove the connectors (1) of the injectors 

from the valve sleeve.

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Removal and installation

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ΛΦ45/55 series

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Note:

Note the sequence in which the injector pipes are 

removed. They should be re-fitted in precisely the 

reverse order.

3.

Unscrew the unions on both sides of the pipe 

and remove the pipes.

4.

Immediately plug the openings.

Installing the injector pipe
1.

Clean the injector pipe and blow-clean it with 

dry compressed air.

2.

Fit the injector pipes in reverse order and 

hand-tighten the unions. When all the pipes 

and unions are correctly fitted, the unions 

must be tightened to the specified torque. 

See "Technical data".

3.

Fit the connectors of the injectors in the valve 

sleeve.

4.

Start the engine to bleed the high-pressure 

section of the fuel system and inspect all fuel 

pipes for leaks.

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Removal and installation

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ΛΦ45/55 series

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5.2 REMOVAL AND INSTALLATION, FUEL SUPPLY PIPE

When removing a fuel pipe, fuel will 

escape. Collect the fuel and avoid 

the risk of fire. 

Dirt in the fuel system can lead to 

significant damage to parts of the 

system. All open connections must 

therefore be sealed.

Removing the fuel supply pipe
1.

Disconnect the injector pipes.

2.

If necessary, remove the fuel rail.

3.

Remove the nut (1) from the fuel supply pipe.

4.

Mark the positions of the fuel supply pipe (1) 

and pull it out of the cylinder head with 

special tool (DAF no. 1329473) (2).

Note:

If the injector is not replaced, the fuel supply 

pipe may be re-used provided it is fitted with 

the original injector. 

Installing the fuel supply pipe
The following guidelines must be adhered to:

-

If the injector is defective, both the injector 

and the fuel supply pipe must be replaced.

-

If the fuel supply pipe is defective and in 

addition the sealing surface with the injector 

is damaged, both the injector and the fuel 

supply pipe must be replaced.

-

If the fuel supply pipe is defective and the 

sealing surface with the injector is not 

damaged, the fuel supply pipe must be 

replaced but the injector can be reused.

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Removal and installation

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1.

Check the fuel supply pipe for damage and 

signs of leakage.

Leakage in the fuel supply pipe can be 

recognised by erosion tracks (lines) on the 

nose of the supply pipe. If necessary or if in 

doubt, replace the fuel supply pipe.

Note:

If any indications of leakage are visible, 

remove the injector and check the injector 

fuel connection for signs of leakage.

2.

Fit a new O-ring on the fuel supply pipe.

3.

Apply a thin layer of clean engine oil to the O-

ring of the fuel supply pipe, the screw thread 

of the nut and the contact surface of the nut 

with the fuel supply pipe.

4.

Check the bore of the fuel supply pipe for 

foreign matter and damage. Also check 

whether the supply bore in the injector is 

correctly positioned for the bore, because it 

is possible to mount the injector turned 

through 180

, so that the fuel supply port is 

on the other side.

Note:

The fuel supply pipe has one or two positioning 

balls. The fuel supply pipe can only be installed 

with the ball(s) on top, as the bore in the cylinder 

head has a groove (1) at the top. Press the fuel 

supply pipe as far as possible into the bore, with 

the ball pointing upwards. Ensure that the O-ring 

is not damaged in this process.

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