Measure ring-end gap with a/an ______ ring.

• A. Spare
• B. Original
• C. Worn
• D. Gauged

Answer: (B)

End gap is checked using the ring that will actually be installed in the bore—the original ring. This ensures the measurement reflects the true clearance for that bore and ring combination, accounting for the ring’s correct thickness and geometry. A worn ring would show a larger gap than what the new or correct-size ring would have, leading to an inaccurate assessment. Using a spare ring might not match the exact dimensions, and a gauged ring isn’t the standard reference for this check. Measuring with the original ring gives you a meaningful, install-ready reading of the end gap.