Final answer:
Flywheel runout can be checked using a dial indicator while the flywheel is still mounted on the crankshaft or using a dial indicator and stand after removing the flywheel. Both methods have their advantages and are used in different situations. The correct answer is C.
Step-by-step explanation:
Flywheel runout is the measurement of any deviation from perfect roundness or flatness in the flywheel's surface. Both A and B are partially correct. Flywheel runout can be checked using a dial indicator while the flywheel is still mounted on the crankshaft, as well as using a dial indicator and stand after removing the flywheel from the engine and placing it on a surface plate. Each method has its advantages and is used in different situations.
When the flywheel is still mounted on the crankshaft, checking for runout helps identify if there are any issues with the alignment of the flywheel and the crankshaft. This method allows for easy evaluation of the flywheel's runout in relation to the crankshaft.
Removing the flywheel from the engine and using a dial indicator and stand provides a more accurate measurement of the flywheel's runout. This method eliminates the influence of other components, allowing for a precise evaluation.
In conclusion, both methods are used to check flywheel runout, but the specific situation and the desired level of accuracy guide the choice of the method to be used.