Captain Quint
New member
I have a 1996 Mercruiser 454, the elbow that the waterline attaches to on the exhaust manifold is plastic. When I was trying to replace them with metal elbows, they broke off leaving the threaded part of the fitting still threaded into the manifold. They have apparently become brittle over time and heat. My problem is how to remove them. I have tried various extraction tools, WD 40, cutting them and trying to take them out in pieces, carefully. I have a tap to clean up the threads once I get them out. Was wondering if there are any other successful ways to remove them, or solvents to help lubricate or dissolve the build up possibly on the threads from pipe dope or the saltwater.