Main Engine Start Air System


The receiver stop valve is opened and air passes to the automatic valve and to the master valve, assuming turning gear is disengaged. Both valves remain closed at this stage. When the start lever is moved to the start position the master valve opens allowing control air to the distributor slide valve loading chambers and to the automatic valve operating chamber.



MAIN ENGINE AIR STARTING SYSTEM



The receiver stop valve is opened and air passes to the automatic valve and to the master valve, assuming turning gear is disengaged. Both valves remain closed at this stage. When the start lever is moved to the start position the master valve opens allowing control air to the distributor slide valve loading chambers and to the automatic valve operating chamber.

The automatic valve is now open and air passes to each cylinder air start valve and to the distributor. Depending upon distributor position, pilot air will pass to either one or two of the cylinder air start valve operating chambers opening the valves and allowing start air to enter the cylinders.

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