1988 Mercury Marquis Repair Question
Can i bypass one bolt on my water pump
Depends on the bolt, which engine you have, etc. Is there enough that you can weld a nut to the remaining bolt? All you need is if it's broken off flush, I can describe how to weld a nut to it.
Drilling it out is another possibility but that almost always ends in a disaster. Some bolts go into the cooling system and had sealer on the threads. If you drill those there's a good chance they will leak later. Have you ever used "Easy Outs" or Heli-Coils?
In some applications you can even drill and tap a new hole next to the old one.
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