September 2014 HZTL2498_EN Revision A
The difference between the highest and the lowest turbocharger speed
must not be more than 3 % relative to the speed limit n
Bmax
.
If this permissible range of difference is exceeded, the following steps
must be carried out:
Reduce engine performance immediately until the highest
turbocharger speed no longer exceeds 70% of n
Bmax
.
If the engine cannot be stopped, continue to run at this reduced engine
performance or turbocharger speed.
If the turbocharger surges continuously, engine performance must be
reduced further.
Measure the temperatures in the air and gas lines to and from the
turbochargers and compare them with standard values.
If the engine can be stopped for a short time:
Inspect the air and gas lines as well as the turbocharger and eliminate
any problems.
In any event, it is recommended that you contact the nearest ABB
Turbocharging Service Station.
If the speed sensor is not fitted on the turbocharger, the following
procedure must be adopted to fit it:
Engine and turbocharger are not running.
The turbocharger lubricating system is switched off.
Remove screw plug (42047) from bearing casing.
Screw in speed sensor (86505) as far as it will go and tighten to torque
specified in table. (See chapter Table of tightening torques.)
Connect speed sensor using cable connector (86515).
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