Which tool is effective in determining piston pin out-of-round wear?

To effectively determine piston pin out-of-round wear, utilizing a micrometer caliper is advantageous due to its precision in measuring the diameter of the piston pin at various points along its circumference. When evaluating wear, it is crucial to compare measurements taken in different orientations to identify any deviation from a perfect circle, which indicates out-of-round conditions.

A micrometer caliper can provide highly accurate readings, making it well-suited for detecting even small changes in the pin's diameter that may signify wear issues. This instrument allows for reproducible measurements, essential for diagnosing problems in piston components.

While other tools like a dial indicator can also measure roundness, the micrometer caliper specializes in direct dimensional measurements, providing the precise information needed to assess piston pin wear. The thickness gauge and torque wrench, although useful in their own contexts, do not serve the specific purpose of determining the geometric integrity of the piston pin.