Emergency operation
Operational misfire
A3.12.02.00
M20-M601C
en / 24.06.1996 BA000154 1/2
Ĺ
Operational misfire - protection of the flexible coupling
The following instructions and restrictions refer only to engines with flexible couplings.
Attention:
If one cylinder fails partially or completely, this will always increase the stresses in the
flexible coupling.
No changes reducing the output to any one cylinder on the engine should therefore be
made.
The additional loads will be the heavier, the smaller that the output of a defective cylinder is. For this
reason, compression should remain, if one cylinder completely misfires. A cylinder head, valve or
piston and connecting rod should only be removed if unavoidable.
If misfiring operation cannot be avoided, it may be necessary to limit the power output of the whole
plant in conformity with its type.
Notes will be given to this effect on the engine control console or in the torsional vibration
calculation. For results of this calculation, see A1.09.
If you have any doubt, contact the manufacturer or make the following provisional arrangement:
Single-engine installations with fixed or CP propeller
• First run the engine at only 50 % of the rated output by reducing the propeller pitch or speed.
• If the gear becomes noisy and/or the speed hunts, vary the speed until the operation is
acceptable.
• Stop the engine not later than 30 min. and touch the coupling with your hand to check it for
heating.
To Next Page
Loading...
General