Technical data

17
Repair instructions
Back pressure, checking
Special tools: 885151
TAMD61, -62, -71 and TAMD72WJ-A: 884970
TAMD61, -62, -71 late model, TAMD63, -72P-A:
885164
If the exhaust system has too much back pressure,
the boost pressure falls and gives reduced engine
power, increased exhaust smoke and higher exhaust
temperature. This, in its turn, can cause burned
valves and turbine failure.
1
Remove the exhaust pipe from the turbocharger
exhaust outlet.
Does not apply to TAMD61, -62, -71 late model and
TAMD63, -72P-A
Remove the studs.
2
Clean the mating surfaces.
3
Does not apply to TAMD61, -62, -71 late model and
TAMD63, -72P-A
Install the longer studs which are included in the
flange kit.
4
Connecting the measurement flange to TAMD61,
-62, -71, -72WJ-A, early model.
Connecting the measurement flange to TAMD61,
-62, -71, -72WJ-A, late model and TAMD62, 72P-A
Does not apply to TAMD61, -62, -71 late model and
TAMD63, -72P-A
Install the measurement flange (1) on the turbine
housing, using gaskets on both sides. Install the
exhaust pipe.
Applies to TAMD61, -62, -71, -72WJ-A late model
and TAMD63, -72P-A
Install the centre flange (1) with a V-clamp on the
turbine housing flange.
Install the exhaust pipe on the measurement flange
with a V-clamp.
5
Connect a pressure gauge graduated to 24 kPa (2440
mm water pillar) with a pressure hose and a suitable
nipple for connection to the measurement flange.
Alternatively, a transparent plastic hose can be
connected to the measurement flange as illustrated.
The difference between the water pillars (A) shows the
exhaust pipe back pressure in mm wp (wp=water
pillar).
Run the engine at full load and full throttle opening for
about a minute and check that the back pressure
does not exceed the permitted value.
Permitted exhaust back pressure = 15.0 kPa (1500
mm wp).