Technical data

15
Repair instructions
Boost pressure, checking
Special tools: 9996065, 9996666, 9998491
When the exhaust emissions are highly sooty or if the
engine is very down on power, the function of the
turbocharger can be suspected. The boost pressure
must always be checked before turbocharger
replacement is considered.
Note that low boost pressure can depend on other
reasons than the turbocharger. Please refer to
“Measures for low boost pressure” on page 16.
1
Outlet for checking boost pressure on TAMD61,
-62, -71, -72WJ-A
Outlet for checking boost pressure on TAMD63
Only applies to TAMD61, -62, -71, -72WJ-A
Remove the plug/sensor fitted beneath the induction
manifold between the aftercooler and the induction
manifold.
Install a standard M18x1.5 nipple in the hole.
Install nipple 9996666 on the standard nipple.
Connect pressure gauge 9996065.
Only applies to TAMD63
Remove the hollow screw in the banjo union for the
smoke limiter.
Replace the existing hollow screw with nipple
9998491.
Connect pressure gauge 9996065 to 9998491.
Only applies to TAMD72P-A
Diagnosis tool 885242 is used to measure the turbo
pressure on the TAMD72P-A.
Please refer to the “Fuel system EDC” instructions in
the Workshop Manual on pages 31–33.
2
Run the engine(s) and start measurement as follows:
Measurement should be carried out at full load with
full throttle whilst the engine speed relatively slowly
passes the engine speed specified for the engine
type.
Please refer to the “Technical Data” in the Workshop
Manual on pages 18 and 19.
During this test, the boost pressure should not fall
below the minimum value specified for the engine
type.
Check the engine speed with a workshop tachometer.
NOTE! It is important that full load is maintained for
long enough to allow the pressure to stabilise, to give
a fair result.