DAF LF45, LF55 Series. Manual - part 295

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10. Fit the attachment bolts (1) in the injector 

clamping bracket (2) to secure the injector. 

Tighten the attachment bolts alternately to a 

torque of 2 Nm.

Note:

Pay special attention to the tightening of the 

attachment bolts (1). The tightening must be 

carried out alternately; ensure that the 

injector clamping bracket (2) is not fitted at 

an angle.

11. 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.

12. 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.

13. Fit the fuel supply pipe. 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.

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. 

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14. Fit the nut (1). Tighten the nut to a torque of 

15 Nm.

15. Tighten the injector attachment bolts to the 

specified torque; see "Technical data".

16. Tighten the fuel supply pipe nut to the 

specified torque; see "Technical data".

17. Connect the injector wiring. Tighten the 

attachment bolts (1) to the specified torque. 

See "Technical data".

18. Fit the exhaust valve rockers.

19. Adjust the clearance of the exhaust valves.

20. Fit the valve cover.

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

22. Fit the injector pipe.

23. Fit the fuel return overflow valve to the 

cylinder head. For the specified tightening 

torque, see "Technical data".

24. Connect the return pipe to this valve.

25. Start the engine to bleed the high-pressure 

section of the fuel system and inspect the 

fuel system for leaks.

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5.4 REMOVAL AND INSTALLATION, FUEL RAIL

When removing the fuel rail, 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. Prevent this by cleaning the 

parts before disassembly and then 

sealing all open connections.

Removing the fuel rail
1.

Remove the connector from the fuel rail 

pressure sensor.

2.

If necessary, remove the plug of the inlet air 

temperature/boost pressure sensor by 

loosening the connector.

3.

Remove the connectors of the injectors (1) 

from the valve sleeve.

4.

Disconnect the cable harness (3) on the fuel 

rail (2) and bend the cable harness away 

from the fuel rail.

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5.

Remove the fuel return pipe from the 

pressure-limiting valve on the fuel rail 

6.

Loosen the pipe clamps from the high-

pressure pipe to the fuel rail.

7.

Loosen the high-pressure pipe from the high-

pressure pump to the fuel rail on the fuel rail 

side by unscrewing the union.

8.

Disconnect the injector pipes.

9.

Remove the fuel rail attachment bolts (2).

10. Remove the fuel rail (3).

Installing the fuel rail
1.

Ensure that the fuel rail is clean.

2.

Fit the fuel rail (3) and hand-tighten the 

attachment bolts (2).

3.

Fit the fuel return pipe (1) onto the pressure-

limiting valve on the fuel rail.

4.

Fit the injector pipes.

5.

Fit the pipe clamps from the high-pressure 

pipe to the fuel rail. Do not tighten them yet.

6.

Fit the high-pressure pipe unions from the 

high-pressure pump to the fuel rail. For the 

specified tightening torques of the unions, 

see "Technical data".

7.

Tighten the attachment bolts (2) of the fuel 

rail to the specified torque. See "Technical 

data".

8.

Tighten the bolt connections of the high-

pressure pipe clamps.

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