DAF 95XF. Manual - part 425

4

XE ENGINE INLET/EXHAUST SYSTEM

General

95

XF series

2-6

6

©

 0008

4

95

XF series

Inspection and adjustment

XE ENGINE INLET/EXHAUST SYSTEM

3-1

3.  INSPECTION AND ADJUSTMENT

3.1

CHECKING AND ADJUSTING THE WASTEGATE TURBOCHARGER

1.

Remove the heat shield from the
turbocharger.

2.

Remove the air supply connector (1) from
the diaphragm housing (2).

3.

Remove the retaining clip (3) and remove
the control rod (4) from the wastegate lever.

4.

Note:
Since the air for the control of the wastegate
is branched from the air supply, air will
escape from the air supply via the
pressure-reducing valve and the
electro-pneumatic boost pressure valve
when detaching the air connection.

Using a pressure-reducing valve, apply the
required pressure setting to the diaphragm
housing connection, see main group
“Technical data”.

5.

Push the wastegate lever fully to the left to
close the wastegate valve.

6.

Adjust the length of the control rod (4),
making sure it fits exactly on to the lever at
the set pressure.

7.

Check the wastegate setting at the specified
pressure, see main group “Technical data”.

8.

Install the retaining clip (3).

i 400395

1 2

4 3

i 400214

4

3

2

1

0

5

4

2

6

©

 0008

4

XE ENGINE INLET/EXHAUST SYSTEM

Inspection and adjustment

95

XF series

3-2

3.2

INSPECTION OF EXHAUST BACK PRESSURE

Inspecting the exhaust back pressure
1.

Remove the plug from the exhaust bend
and install a suitable coupling with a pipe.
The first part of the pipe must be made of
metal, to withstand the high temperatures.

2.

Note:
Use an attenuated gauge to prevent
excessive shaking of the gauge needle.

Connect a pressure gauge to the pipe,
with a range of at least 0.1 - 0.2 bar
(10 - 20 kPa).

3.

Note:
The engine brake must not be used during
measurements.
This is done to protect the pressure gauge.

Measure the exhaust back pressure at the
maximum loaded engine speed and
compare the measurement result with the
specified value. See main group “Technical
data”.

i 400180

6

©

 0008

4

95

XF series

Inspection and adjustment

XE ENGINE INLET/EXHAUST SYSTEM

3-3

3.3

INSPECTION AND PRESSURE-TESTING OF AIR INLET SYSTEM

When pressure-testing the air-inlet
system, the plugs may spring off if
they are not properly secured.

In the air inlet system, check the condition and
attachment of the air inlet channels/ flexible
pipes.

In case of doubt as to the proper sealing of the
air inlet system, indicated by the following:
-

loss of power

-

high fuel consumption

-

unusual noises,

carry out a pressure test to check the air inlet
system for leaks.

1.

Remove the front engine encapsulation.

2.

Remove the air inlet hose between the
intercooler and the inlet manifold.

3.

Install the inlet hose with the special tool
(DAF no. 0694831) on the intercooler,
twisting it slightly.

4.

Remove the air inlet pipe between the air
cleaner housing and the turbocharger intake
port.

5.

Install the special tools (DAF no. 1329310
and DAF no. 1329311) on the turbocharger
intake port.

6.

Connect an air hose with reducing valve to
the plug (A), and charge the system to
approx. 1 bar.

7.

Use soapy water to check the complete inlet
system for air leakage. Also check whether
the pressure gauge of the reducer valve
moves down.

i 400203

i 400204

A

6

©

 0008