Replacement Component Fit: Verify the Interface Before Modification

What needed to be solved

A replacement assembly did not fit the site interface as expected. Modifying the replacement immediately could solve the wrong problem if the field dimension, measurement method or mating component was misunderstood.

Information that materially changes the answer

• Replacement drawing
• Actual component dimensions
• Site shaft / bore measurement
• Measurement instrument and method
• Tolerance / fit requirement
• Photos of interference / looseness
• Original part where available

How the requirement is broken down

1. Confirm measurement tool and zero/reference.
2. Measure the site interface at more than one location where relevant.
3. Compare actual replacement dimension with drawing and tolerance.
4. Determine whether the mismatch is design, manufacture, measurement or site-condition related before grinding or re-machining.

Practical execution route

The fit issue is converted into an interface-verification problem. The correct final action may be rework, a revised bore, a bush, or a corrected measurement — but the evidence must decide which.