Question

Most manufacturers recommend that piston diameter be measured at 90 degrees to the wrist pin bore. Where is the recommended measurement location?

1) At the very top of the piston
2) At the wrist pin bore centerline
3) About 3/4 inch below the wrist pin bore centerline
4) About 1/4 inch from the bottom of the piston skirt

Answer 1

The recommended measurement location to measure the piston diameter is at the wrist pin bore centerline.

Step-by-step explanation:

The recommended measurement location to measure the piston diameter is 2) At the wrist pin bore centerline. This means that the measurement should be taken at the center of the wrist pin bore, which is the opening where the wrist pin is inserted into the piston. This is the most accurate location to measure the diameter, as it represents the true dimension of the piston.

Measuring the piston diameter at other locations, such as at the very top of the piston, about 3/4 inch below the wrist pin bore centerline, or about 1/4 inch from the bottom of the piston skirt, may not provide an accurate measurement.