DAF 95XF. Manual - part 388

4

XF ENGINE FUEL SYSTEM

General

95

XF Serie

2-2

2.2

DESCRIPTION OF FUEL SYSTEM

XF engines are equipped with an in-line injection
pump with a mechanical regulator and a smoke
limiter.
The exhaust control unit controls the fuel output
in accordance with the boost pressure in the
inlet manifold.
The mechanical regulator controls the fuel
output in accordance with the engine load.

A manual fuel lift pump is fitted to bleed the
low-pressure area of the system.

To achieve permanent bleeding of the
low-pressure area, a banjo bolt with a calibrated
hole has been installed in the head of the filter.
A very small quantity of fuel will also escape
through this calibrated hole. But because the
hole is so small, and the fuel supply so large,
pressure will be built up in the filter, and the fuel
will be forced on to the fuel pump.

2

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4

95

XF series

Inspection and adjustment

XF ENGINE FUEL SYSTEM

3-1

3.  INSPECTION AND ADJUSTMENT

3.1

INSPECTION AND ADJUSTMENT OF INJECTION TIMING

Inspecting the pump timing
1.

Remove the plug in the side of the fuel
pump regulator housing. Collect the
lubricating oil.

2.

Insert the sensor of the special tool
(DAF no. 1310455) as far into the hole as
possible.

3.

Connect the earth clamp of the tool to the
fuel pump housing.

4.

Use special tool (DAF no.1310477) to crank
the engine slowly in the direction of rotation,
until both LEDs (A and B) on the tool
light up.

5.

Remove the valve cover from cylinders 4, 5
and 6. Check whether the valves of
cylinder 6 rock.

6.

Check on the flywheel whether the pump
timing is correct, see main group “Technical
data”.

i 400168

A

B

i 400169

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4

XF ENGINE FUEL SYSTEM

Inspection and adjustment

95

XF series

3-2

Setting the pump timing
1.

Remove the valve cover from cylinders 4, 5
and 6.

2.

Use special tool (DAF no. 1310477) to
crank the engine slowly in the direction of
rotation until the valves of cylinder 6 rock.

3.

Use special tool (DAF no. 1310477) to
crank the engine counter to the direction of
rotation, through several degrees.

4.

Use special tool (DAF no. 1310477) to
crank the engine in the direction of rotation
through the correct number of degrees
(injection timing) before the top dead centre,
see main group “Technical data”.

5.

Remove the clamp bolt (1) from the clamp.

6.

Remove the plug in the side of the fuel
pump regulator housing. Collect the
lubricating oil.

7.

Insert the sensor of the special tool
(DAF no. 1310455) as far into the hole as
possible.

i 400171

1

i 400168

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4

95

XF series

Inspection and adjustment

XF ENGINE FUEL SYSTEM

3-3

8.

Connect the earth clamp of the tool to the
fuel pump housing.

9.

Crank the engine slowly in the direction of
rotation until both LEDs (A and B) on the
tool light up.

10. Install a new clamping bolt (1) in the clamp

and tighten it to the specified tightening
torque, see main group “Technical data”.

11. Check the clutch plates for cracking and

whether they have been installed
stress-free. If there is stress on the clutch
plates, they will be “convex” or “concave”.
Check using a steel measuring rod.

12. Remove the special tool from the fuel pump

regulator housing. Install the plug with a
new sealing ring.

13. Install the valve cover.

A

B

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i 400171

1

i 400184

2

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