Where should the dial indicator be positioned to check flywheel face turnout?

Positioning the dial indicator on the well housing is the correct choice for checking flywheel face turnout because it provides a stable and directly aligned reference point relative to the flywheel itself. The well housing, as part of the transmission or engine assembly, allows for accurate measurement of runout or eccentricity of the flywheel face as the engine rotates. By capturing measurements here, you ensure that any variations in the flywheel face are detected accurately, as the well housing remains stationary during the measurement process.

The other options, while they may seem viable, do not offer the same level of precision. For instance, placing the dial indicator on the flywheel casing may not provide a direct measure of the flywheel face itself, thus potentially leading to inaccuracies. The clutch assembly could introduce variables due to its movement and engagement dynamics, affecting measurement reliability. Likewise, positioning the dial indicator on the engine block may not align closely enough with the flywheel face, again compromising the accuracy needed to assess turnout effectively. Therefore, the well housing stands out as the ideal reference point for this measurement task.