What tool is generally used to measure the crankshaft rotation in degrees?

The timing disk is specifically designed for measuring crankshaft rotation in degrees, making it the most appropriate tool for this task. It is typically a circular disk that is installed on the crankshaft and has degree markings around its circumference. When the crankshaft is rotated, the degree markings allow for precise measurements of its rotation, which is crucial for tasks such as timing adjustments or setting ignition timing on an engine.

While the protractor, caliper, and angle finder also measure angles, they are not specifically tailored for the context of engine crankshaft measurement. A protractor is used for measuring angles in various applications, a caliper measures linear dimensions, and an angle finder is more general-purpose rather than designed for the rotation of a crankshaft. In an aviation maintenance environment, using the timing disk would ensure accurate measurements directly relevant to the performance and tuning of reciprocating engines.