Question

A crank journal is being measured in the same direction at opposite ends. This is measuring for:

1) Taper
2) Out-of-roundness
3) Wear
4) Bearing size

Answer 1

Measuring a crank journal at opposite ends is done to check for taper, which can affect bearing fit and functionality.

Step-by-step explanation:

When a crank journal is measured in the same direction at opposite ends, it is typically checked for taper. Taper refers to a gradual reduction in diameter along the length of the crank journal, which can occur due to wear or manufacturing inconsistencies. If the measurements taken at opposite ends vary, it indicates the presence of taper, which affects how the bearing will fit and function around the crankshaft. The crank journal needs to have consist. By measuring the crank journal in this way, any irregularities or distortions in its shape can be detected.