Final answer:
The proper procedure to repair a rusted hole in a tailpipe generally involves cleaning and welding over the hole, or replacing the assembly for a long-term solution. Options like gluing a patch or wrapping with exhaust tape are considered temporary fixes.
Step-by-step explanation:
If a tailpipe has a rusted hole in it, the proper procedure to repair it depends on a few factors such as the size of the hole, the condition of the rest of the exhaust system, and the vehicle owner's preferences. One common method is option A, Clean and weld over the hole, which is often performed by professionals. This involves grinding out the rust, cleaning the area thoroughly, and then welding a new piece of metal over the hole, which can be an effective and permanent repair if done correctly.
Option B, Glue a patch over the hole, is generally considered a temporary fix and doesn't usually last long due to the harsh conditions of the exhaust system. Option C, Replace the assembly, is the best long-term solution, especially if the exhaust system is old or heavily corroded, because it ensures the rest of the system remains intact and free of leaks for a longer period. Lastly, option D, Wrap the hole with exhaust tape, is another temporary repair that can be used as a quick fix until a more permanent solution is pursued.