FAA Powerplant Written Practice Test

Which tool is typically used to measure crankshaft rotation in degrees?

1. Torque wrench

2. Measuring tape

3. Dial indicator

4. Timing disk

The correct answer is: Timing disk

The timing disk is specifically designed to measure crankshaft rotation in degrees. It is typically marked with increments that allow for precise readings of the crankshaft position as it rotates. This tool is critical in applications such as engine timing adjustments, where exact crankshaft angles are crucial for optimal engine performance and synchronization of components like valves and ignition timing. In contrast to the timing disk, other tools like a torque wrench are used for applying a specific amount of torque to fasteners and do not provide rotational angle measurements. A measuring tape serves a completely different purpose, primarily for linear measurements, and does not relate to the details of engine timing or crankshaft rotation. A dial indicator, while useful for measuring small displacements or deviations in motion, doesn’t specifically tackle the measurement of rotational degrees of a crankshaft. Thus, the timing disk stands out as the appropriate and accurate tool for this particular measurement task.