Engine: Retired questions · Motor Plants and Auxiliary Boilers

1. A The circuit shown is used to shift the cam shaft position when reversing the engine.
2. B The piston labeled A provides a low pressure signal to the other components illustrated.
3. C Valve D, when depressed, allows the retained pneumatic pressure within the shut-down servo motor to be relieved.
4. D When oil pressure to valve C is diminished, a pressure decrease is developed at valve D, causing it to shift, and nullifying the actuating signal to device A.

Tip: press A-D to answer