During an overhaul, how are reciprocating engine exhaust valves typically checked for stretch?

Prepare for the FAA Reciprocating Powerplant Test. Utilize flashcards and multiple-choice questions, each with explanations and hints. Enhance your knowledge and ace your exam!

Checking reciprocating engine exhaust valves for stretch typically involves confirming that the shape and dimensions of the valve are within specified tolerances after they have been subjected to heat and mechanical stress during operation. The correct method for assessing exhaust valves utilizes a contour or radius gauge, which helps ensure that the profile of the valve is consistent and that it has not undergone any deformation that could affect its performance.

Using a contour gauge is appropriate because it allows for precise measurement of the valve's profile against a template or standard, ensuring that any deviation in radius or contour caused by wear or stress is accurately detected. This is important because exhaust valves experience significant thermal and mechanical loads, leading to potential warping or stretching that can affect sealing and performance.

In contrast, other measurement tools such as calipers and height gauges, while useful for linear measurements, do not provide the necessary assessment of the valve's contour and structural integrity. Thus, utilizing a contour or radius gauge is the best choice for accurately determining if an exhaust valve has been improperly stretched or deformed.

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