I recently work on a friends boat is has a omc cobra out-drive it is a 1990 with a 4.3 Ho motor it was making a really loud knocking noise we found that the engine coupler was worn out and the gimble bearing was pretty much gone it came out in two pieces well that's all i could find of it i put a new coupler new bearing and seals everything is working good except there is water leaking inside the boat directly under the exhaust tube come to find out the boat was ran for three days with the coupler and bearing gone not sure were to start on this.
