Question 68Motor Plants - 1st Asst/Chief

The correct answer is B) provide lubrication to the cylinder. The device shown in figure "A" of the illustration MO-0042 is likely a lubricator, which is used to provide lubrication to the cylinder. This is necessary to reduce friction and wear on the internal components of the engine, ensuring proper operation and prolonging the engine's lifespan. The other answer choices are incorrect because: A) admits starting air to the cylinder, C) injects fuel into the cylinder, and D) provides an adapter to obtain combustion pressure readings, which are not the primary function of the device shown in the illustration.