Emergency operation
Operational misfire
A3.12.02.01
M20-M601C
en / 02.11.1998 BA000753 2/2
Ĺ
2. Total misfire
In case the engine is supported by flexible bearings and a running gear has to be dismoun-
ted completely, the engine has to be fixed in accordance with the instructions
A5.05.02.12.00.nn.
The possible outputs and speeds at which a damaged engine can be operated, depend on
the system in question and have to be made out by touching while speed and output are
slowly increased.
The following limit values have to be strictly observed, and the actual values must not fall
below the limit values:
• The engine speed must not exceed 80% of the rated speed (A1.10).
This limit value applies to engines arranged rigidly as well as flexible.
• The exhaust gas temperatures upstream turbocharger must not exceed the
temperatures indicated in A1.10.
• „Surging“ of the turbocharger has to be avoided.
• Output and/or speed have to be changed in case transmission noises and/or high speed
variations occur
• The temperature at the surface of the coupling must not exceed 60 °C.
• During emergency operation, the anchor bolts of the fixing device of a flexible bearing
support are to be checked permanently for tight fit.
The engine output possible under these conditions is approx. 35 % of the rated output. In
case of doubt please contact Caterpillar / MaK .
2.1 Twin engine systems / generator systems
The damaged engine should not be restarted.
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