Which statement about cylinder bore measurement is true?

Which statement about cylinder bore measurement is true?

• A. A dial bore gauge is used to measure the bore
• B. A tape measure provides the most precise bore measurement
• C. A micrometer is preferred for bore measurement
• D. The bore is not measured during engine inspection

Answer: (A)

Measuring a cylinder bore requires an instrument that can accurately read inside the circular surface. A dial bore gauge is designed for this job because it directly measures the internal diameter of a bore and reveals any runout or taper with a dial readout as you move the gauge along the bore. This tool provides quick, repeatable readings at different depths, which is essential since wear isn’t always uniform along the bore. A tape measure cannot give the precision needed for engine tolerances, and a micrometer is meant for outside diameters (or requires additional steps with a telescoping gauge to measure inside), making it less practical for direct bore measurement. Therefore, using a dial bore gauge is the appropriate choice during engine inspection to assess bore size and condition.

Measuring a cylinder bore requires an instrument that can accurately read inside the circular surface. A dial bore gauge is designed for this job because it directly measures the internal diameter of a bore and reveals any runout or taper with a dial readout as you move the gauge along the bore. This tool provides quick, repeatable readings at different depths, which is essential since wear isn’t always uniform along the bore. A tape measure cannot give the precision needed for engine tolerances, and a micrometer is meant for outside diameters (or requires additional steps with a telescoping gauge to measure inside), making it less practical for direct bore measurement. Therefore, using a dial bore gauge is the appropriate choice during engine inspection to assess bore size and condition.