Which tool is used to check flywheel face runout?

Which tool is used to check flywheel face runout?

• A. Caliper
• B. Dial indicator
• C. Feeler gauge
• D. Torque wrench

Answer: (B)

Measuring flywheel face runout requires sensing tiny lateral movement of the surface as the wheel turns. A dial indicator is ideal because it provides a high-sensitivity readout in thousandths of an inch, and, when mounted on a stable base, you can zero it on a reference point and then rotate the crank to see how much the surface deviates from true. The indicator’s needle movement directly shows the amount of runout, giving a precise measurement of how much the flywheel face is out of plane. Calipers measure dimensions at a single static point and won’t capture the variation as the surface spins; a feeler gauge measures gaps at a specific location and doesn’t track continuous surface deviation; a torque wrench is for applying a specific torque, not for measuring runout. So the dial indicator best fits the need to quantify flywheel face runout.

Measuring flywheel face runout requires sensing tiny lateral movement of the surface as the wheel turns. A dial indicator is ideal because it provides a high-sensitivity readout in thousandths of an inch, and, when mounted on a stable base, you can zero it on a reference point and then rotate the crank to see how much the surface deviates from true. The indicator’s needle movement directly shows the amount of runout, giving a precise measurement of how much the flywheel face is out of plane. Calipers measure dimensions at a single static point and won’t capture the variation as the surface spins; a feeler gauge measures gaps at a specific location and doesn’t track continuous surface deviation; a torque wrench is for applying a specific torque, not for measuring runout. So the dial indicator best fits the need to quantify flywheel face runout.