DAF CF65, CF75, CF85 Series . Manual — part 423

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Removal and installation

CE ENGINE FUEL SYSTEM

ΧΦ65/75/85 series

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2

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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Removal and installation

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ΧΦ65/75/85 series

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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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Removal and installation

CE ENGINE FUEL SYSTEM

ΧΦ65/75/85 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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5-4

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Removal and installation

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ΧΦ65/75/85 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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