DAF LF45, LF55 Series. Manual - part 317

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5-3

Removal and installation

CE ENGINE FUEL SYSTEM

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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CE ENGINE FUEL SYSTEM

5-4

©

 200416

Removal and installation

5

ΛΦ45/55 series

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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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Removal and installation

CE ENGINE FUEL SYSTEM

ΛΦ45/55 series

4

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5.

Install the nut (1) and tighten it to the 

specified torque. See "Technical data".

6.

If the fuel rail was removed, re-fit it.

7.

Fit the injector pipes.

8.

Start the engine to bleed the high-pressure 

section of the fuel system and inspect the 

fuel system for leaks.

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5-6

©

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Removal and installation

5

ΛΦ45/55 series

4

5.3 REMOVAL AND INSTALLATION, INJECTOR

When removing an injector, 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 injector
1.

Remove the fuel return overflow valve to let 

the return bore in the cylinder head empty to 

the fullest possible extent. Collect the 

escaping fuel.

2.

Remove the injector pipe.

3.

Remove the fuel supply pipe.

Note:

-

If an injector is removed without the fuel 

supply pipe having first been removed, 

serious damage can ensue.

-

If the injectors are removed, they must 

be removed together with the fuel 

supply pipes.

4.

Remove the valve cover.

5.

Remove the exhaust valve rockers.

6.

Remove the injector wiring (1).

7.

Remove the two attachment bolts (2) from 

the injector clamping bracket (3).

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