DAF CF65, CF75, CF85 Series . Manual — part 434

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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.

}

A

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Inspection and adjustment

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ΧΦ65/75/85 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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ΧΦ65/75/85 series

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3.6 CHECKING INLET UNDERPRESSURE

1.

Remove the air filter indicator from the inlet
pipe between the air filter housing and the
turbocharger.

2.

Connect a pressure gauge with a maximum
rating of -100 mbar (-10 kPa) to the
connection of the air filter indicator.

3.

Measure the inlet underpressure at full-load
engine speed and compare the
measurement to the specified value. See
"Technical data".

4.

Remove the pressure gauge and fit the air
filter indicator.

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