Question 414Motor Plants - Assistant Engineer

The correct answer is B) Correct Answer! If the compression rings on a diesel engine piston become stuck in the ring groove, the cause may be due to excessive ring action. This can happen when the rings are unable to move freely within the ring groove, often due to deposits or other build-up that prevents the rings from rotating and flexing as they should. This restricted ring movement can lead to the rings becoming stuck, which can then cause further damage to the engine. The other answer choices are incorrect because: A) excessive ring action is the correct cause, C) improper ring rotation is a symptom rather than a cause, and D) excessive ring face wear is a different issue that would not directly lead to the rings becoming stuck.