What should be done to prevent cross threading?

To prevent cross threading when installing fasteners, starting all fasteners by hand before using any tools is essential. This approach allows for a more precise alignment of the fastener with the threaded hole, ensuring that the threads engage correctly. When fasteners are started by hand, it becomes easier to feel any resistance and detect misalignment before applying any significant force. This method reduces the likelihood of damaging the threads or creating cross threading, which can lead to improper fastening and potential failure of the joint.

In contrast, using a torque wrench is beneficial for applying the correct torque but does not inherently prevent cross threading if the fastener is misaligned during installation. Tapping and reversing thread fastener holes or removing old gasket material might be relevant to other aspects of maintenance and installation but do not specifically address the immediate prevention of cross threading during the initial fastening process. Thus, the most effective way to ensure proper alignment and thread engagement is to start all fasteners by hand.