To check the flywheel face runout, secure the dial indicator base to which surface?

• A. Flywheel housing
• B. Engine block
• C. Crankshaft flange
• D. Bell housing

Answer: (A)

Measuring flywheel face runout needs a fixed reference that doesn’t move as the engine turns. Secure the dial indicator’s base to the flywheel housing because this surface is attached to the engine and stays stationary relative to the crankshaft. With the base fixed to the housing, rotating the crank and flywheel lets the dial indicator read any wobble or deviation in the flywheel face accurately. If you anchored the base to the crankshaft flange or to the engine block in a way that isn’t consistently fixed to the rotating parts, the reference could move or sit out of true alignment, giving misleading readings. The flywheel housing provides the proper, stable reference for a correct runout measurement.