DAF LF45, LF55 Series. Manual — part 326
©
200416
3-1
Inspection and adjustment
CE ENGINE INLET/EXHAUST SYSTEM
ΛΦ45/55 series
4
6
3. INSPECTION AND ADJUSTMENT
3.1 INSPECTING TURBOCHARGER WASTEGATE
Note:
Depending on the fitting position of the
turbocharger, it may be necessary to remove the
turbocharger from the engine before this
adjustment; see "Removal and installation".
Note:
The turbocharger is calibrated in the factory and
must not be re-adjusted. The length of the control
rod on the wastegate valve lever may only be
changed when assembling a new turbocharger.
After that, only an inspection of the actuating
pressure of the wastegate may be carried out. If
the result is negative, the turbocharger must be
replaced.
1.
Remove the flexible pipe (2) from the
diaphragm box (1) of the wastegate.
2.
Connect an air-pressure reducer valve to the
diaphragm box of the wastegate. Set the
reducer valve to max. 0.2 bar gauge
pressure. Connect the reducer valve to a
compressed air installation.
3.
Set the reducer valve to exactly the same
test pressure as listed in "Technical data".
4.
Check the diaphragm in the diaphragm box
for leaks by listening carefully for a hissing
sound from the diaphragm box.
5.
Check whether the control rod of the
wastegate has moved. If it has not moved,
the control rod must be loosened from the
lever. Check again whether the control rod
has moved. If is has not moved, the
diaphragm box must be replaced. If it has
moved, the wastegate valve must be made
to move freely or, if that does not help
sufficiently, the entire compressor unit must
be replaced.
6.
Remove the flexible pipe with the reducer
valve and re-connect the flexible pipe of the
compressor pump to the wastegate
diaphragm box.
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CE ENGINE INLET/EXHAUST SYSTEM
3-2
©
200416
Inspection and adjustment
6
ΛΦ45/55 series
4
3.2 INSPECTING TURBOCHARGER AXIAL BEARING PLAY
Note:
The turbocharger axial bearing play should only
be checked when the engine is cold.
1.
Remove the exhaust pipe from the
turbocharger.
2.
Remove the charge pipes from the
turbocharger.
3.
Fit a dial gauge (1) to the charge supply
flange of the turbocharger.
4.
Push the compressor shaft away from the
dial gauge and set the gauge to zero.
5.
Push the compressor shaft to the dial gauge
and read off the axial play. Compare the
reading with the specified value; see
"Technical data". Replace the turbocharger if
necessary.
6.
Fit the charge pipes to the turbocharger.
7.
Fit the exhaust pipe to the turbocharger.
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©
200416
3-3
Inspection and adjustment
CE ENGINE INLET/EXHAUST SYSTEM
ΛΦ45/55 series
4
6
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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CE ENGINE INLET/EXHAUST SYSTEM
3-4
©
200416
Inspection and adjustment
6
ΛΦ45/55 series
4
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.
i400513
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