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Interlocks and Blocking devices in main engine starting system

Interlocks or blocking devices are provided so that engine cannot be started until required conditions are fulfilled .
Turning gear interlock prevents engine starting while turning gear engaged.

Running dirction interlock prevents engine to be started in reverse direction until all cam rollers of fuel pump have shifted.
Telegraph position interlock allows engine to be started only in the direction intended by bridge. Distributor position interlock.checks whether distributor is whether in start or stop direction.it has to be in either in one direction to commence starting.

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