DAF LF45, LF55 Series. Manual - part 316

©

 200416

4-7

Inspection and adjustment

CE ENGINE FUEL SYSTEM

ΛΦ45/55 series

4

5

7.

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.

8.

Check that the injector fuel connection is not 

leaking.

Leakage in the injector fuel connection can 

be recognised by erosion tracks (lines) in the 

socket of the fuel connection . If necessary or 

if in doubt, replace the injector.

Note:

If fuel has been found in the lubricating oil, 

extra attention must be paid to the O-rings of 

the injectors, as these have most probably 

been damaged by increased pressure in the 

return circuit as a result of an internal leak. 

Note:

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.

9.

Fit the injector and fuel supply pipe. See 

"Removal and installation".

10. Again inspect for internal fuel leaks to check 

that there is no leakage.

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CE ENGINE FUEL SYSTEM

4-8

©

 200416

Inspection and adjustment

5

ΛΦ45/55 series

4

©

 200416

5-1

Removal and installation

CE ENGINE FUEL SYSTEM

ΛΦ45/55 series

4

5

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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CE ENGINE FUEL SYSTEM

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©

 200416

Removal and installation

5

ΛΦ45/55 series

4

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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