DAF LF45, LF55 Series. Manual — part 296

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Removal and installation

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9.

Install the cable harness (3) to the fuel rail (2)

and secure it using cable ties.

10. Fit the connectors of the injectors (1) in the

valve sleeve.

11. If it has been removed, fit the plug of the inlet

air temperature/boost pressure sensor to the

sensor.

12. Fit the connector of the fuel rail pressure

sensor.

13. Start the engine and check the fuel system

for leaks.

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Removal and installation

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5.5 REMOVAL AND INSTALLATION, FUEL RAIL PRESSURE-LIMITING VALVE

When removing the pressure-

limiting valve, 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 fuel rail pressure-limiting valve
1.

Clean the pressure-limiting valve (2) and the

surrounding area.

2.

Remove the fuel return pipe (3) from the

pressure-limiting valve (2).

3.

Remove the pressure-limiting valve (2) from

the fuel rail (1).

Installing fuel rail pressure-limiting valve
1.

Check the sealing surface and the screw

thread of the pressure-limiting valve and the

fuel rail.

2.

Install the pressure-limiting valve in the fuel

rail and tighten the valve to the specified

torque. See "Technical data".

3.

Fit the fuel return pipe on the pressure-

limiting valve.

4.

Start the engine and check the pressure-

limiting valve for leaks.

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Removal and installation

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5.6 REMOVAL AND INSTALLATION, HIGH-PRESSURE PUMP

When removing the high-pressure

pump, 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 high-pressure pump
1.

Clean the high-pressure pump and that part

of the engine around it thoroughly with, for

example, a steam cleaner. Cover the places

at which leaks have been detected to

prevent dirt getting into the fuel system.

2.

Disconnect the fuel pipes from the high-

pressure pump. Loosen the return pipe only

on the high-pressure pump.

3.

If fitted, uncouple the connector of the fuel

temperature sensor (1) on the fuel fine filter

head and the connector of the fuel pump

control solenoid valve (2).

4.

Remove the fuel fine filter together with the

filter head.

5.

Loosen both unions from the high-pressure

pipe to the fuel rail as well as the pipe

clamps. Remove the high-pressure pipe.

Plug all openings.

6.

Remove the three high-pressure pump

attachment nuts and then the high-pressure

pump.

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Removal and installation

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Note:

The high-pressure pump is fitted on the gear side

with an adapter ring (1) and an O-ring (2) in the

timing gear case. If the removal of the high-

pressure pump is particularly difficult, it may be

necessary to press the adapter ring (1) carefully

out of the timing gear case using a small pry bar.

Installing the high-pressure pump
1.

Clean the high-pressure pump. Make sure

that no dirt or cleaner can get into the high-

pressure pump ducts.

2.

Check the high-pressure pump and the drive

gear (externally) for wear and damage.

3.

Fit a new O-ring (2) on the adapter ring (1)

and apply a thin layer of engine oil to the O-

ring.

4.

Fit the high-pressure pump and press it into

the timing gear case by means of the

attachment nuts.

5.

Tighten the attachment nuts to the specified

torque. See "Technical data".

6.

Fit the filter head and the fuel fine filter.

7.

Fit the high-pressure pump to the fuel rail

and tighten the unions. See "Technical data"

for the specified tightening torques.

8.

Tighten the pipe clamps.

9.

If fitted, connect the connector of the fuel

temperature sensor (1) on the fuel fine filter

head and the connector of the fuel pump

control solenoid valve (2).

10. Fit the fuel pipes to the high-pressure pump.

11. Bleed the fuel system. See "Inspection and

adjustment".

12. Start the engine and check the fuel system

for leaks.

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