DAF LF45, LF55 Series. Manual - part 327

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Inspection and adjustment

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3.5 INSPECTION AND PRESSURE-TESTING, AIR INLET SYSTEM

When pressure-testing the air inlet 

system, the plugs may spring off if 

they are not properly secured. It is 

therefore important to check the 

attachment of the plugs before 

pressure-testing and keep people 

away from the area.

1.

Check the condition and mounting of the air 

inlet channels/pipes of the air inlet system.

Note:

In case of doubt as to the proper sealing of 

the air inlet system, which is indicated by the 

following:

- loss of power

- high fuel consumption

- unusual noises

- lit engine fault symbol on the instrument 

panel, ???carry out a pressure test to check 

the air inlet system for leakage.

2.

Remove the right-hand and rear engine 

encapsulations.

3.

Loosen the inlet hose between the air cooler 

and the inlet manifold at the inlet manifold 

side.

4.

Fit the special tool (DAF no. 1453171) in the 

hose.

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A

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Inspection and adjustment

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ΛΦ45/55 series

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5.

Loosen the plastic pipe between the air filter 

housing and the rubber suction hose on the 

turbocharger.

6.

Install special tool (DAF no. 0694831) in the 

rubber intake port on the turbocharger.

7.

Connect an air pipe with reducer valve to the 

sealing cap (A) and charge the system to 

approx. 1 bar.

8.

Use a soapy solution to check the whole inlet 

system for air leaks. Also check whether the 

pressure gauge of the reducer valve drops.

9.

Fit the loosened hoses of the inlet system 

and the engine encapsulation.

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ΛΦ45/55 series

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3.6 CHECKING INLET UNDERPRESSURE

1.

Remove the connection of the air intake pipe 

underpressure indicator (1) from between 

the air filter housing and turbocharger.

2.

Connect a pressure gauge with a maximum 

rating of -100 mbar (-10 kPa) to the 

connection of the underpressure indicator.

3.

Measure the inlet underpressure at full-load 

engine speed and compare the 

measurement to the specified value. See 

"Technical data".

4.

Fit the connection of the air intake pipe 

underpressure indicator (1) between the air 

filter housing and turbocharger.

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Inspection and adjustment

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ΛΦ45/55 series

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