DAF LF45, LF55 Series. Manual - part 303

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3.3 INSPECTING TURBOCHARGER RADIAL BEARING PLAY

Note:

The turbocharger radial bearing play should only 

be checked when the engine is cold.

1.

Remove the turbocharger from the exhaust 

manifold. See "Removal and installation".

2.

Fit a pressure gauge to the turbocharger 

housing and measure the radial play. 

Compare the reading with the specified 

value; see "Technical data". Replace the 

turbocharger if necessary.

3.

Fit the turbocharger. See "Removal and 

installation".

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Inspection and adjustment

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3.4 CHECKING EXHAUST GAS BACK PRESSURE

Checking exhaust gas back pressure
1.

Remove the plug from the exhaust elbow 

attachment or bore a hole and install a 

suitable coupling with a pipe. The first part of 

the pipe must be made of metal, to withstand 

the high temperatures.

Note:

Use an attenuated gauge to prevent 

excessive shaking of the gauge needle.

2.

Connect a pressure gauge to the pipe, with a 

range of at least 0.1 - 0.2 bar (10 - 20 kPa).

Note:

The engine brake must not be used during 

measurements. This is to protect the 

pressure gauge.

3.

Measure the exhaust gas back pressure at 

full-load engine speed and compare the 

measurements to the specified value. See 

"Technical data". Check the exhaust system 

if the exhaust gas back pressure is too high.

4.

Remove the pressure gauge and the 

coupling and fit the plug.

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Inspection and adjustment

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ΛΦ45/55 series

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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 intake 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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5.

Loosen the plastic pipe between the air filter 

housing and the rubber suction hose on the 

turbocharger.

6.

Install special tool (DAF no. 1453172) 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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