Which tool is used to verify crankshaft endplay?

To verify crankshaft endplay, a dial indicator is the most suitable tool because it provides precise measurements of the axial movement of the crankshaft. The dial indicator can be set up to measure the amount of endplay by placing its probe against the crankshaft and then pushing the crankshaft in both directions—forward and backward. The readings on the dial indicator will directly reflect the distance the crankshaft can move in the axial direction.

Using a dial indicator for this purpose allows for high accuracy, which is crucial when checking tolerances. Proper endplay is essential for engine performance and longevity, as too much or too little endplay can lead to mechanical failure.

In contrast, while Plastigauge is often used for measuring clearances between bearings and journal surfaces, it is not designed for measuring endplay specifically. Feeler blades are used to measure gap thicknesses, but they do not provide the precise axial movement measurement needed for endplay verification. A protrusion gauge is not typically utilized for this type of measurement either, as it is meant for checking the projection of components, not for assessing axial play.