DAF LF45, LF55 Series. Manual — part 316

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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

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200416

Inspection and adjustment

5

ΛΦ45/55 series

4

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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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Removal and installation

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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.

1

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