When replacing spark plugs, which of the following is NOT true?

When replacing spark plugs, it is essential to start the spark plug by hand, using your fingers. This process helps prevent cross-threading and ensures that the plug is aligned correctly with the cylinder head. The use of a torque wrench is also crucial because it allows for the spark plug to be tightened to the manufacturer's specifications, which helps avoid over-tightening or under-tightening, both of which can lead to damage or improper performance.

Cleaning the spark plug threads is important as well, as debris can interfere with the proper seating of the spark plug, leading to potential leaks or incomplete combustion.

With that context, starting the threads of a spark plug using a ratchet is not advisable. This practice could lead to misalignment and cross-threading, which can damage the engine. Starting the spark plug by finger-tightening ensures that it is properly aligned, maintaining the integrity of the threads and allowing for a proper seal once fully tightened with the appropriate tools.