During the starting of a diesel engine, compression gases are prevented from backing into the air starting system, shown in the illustration, by the __________. Illustration MO-0046

Correct Answer: Option A — cylinder air starting check valves

Cylinder air starting check valves act as positive pneumatic non-return valves, withstanding extreme combustion chamber pressures during the firing cycle and preventing hot gases from entering or degrading the main starting air distribution manifold.