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Recently rebuilt long-bell and short-bell B6 horns. A couple of interesting observations filed under the "you never know what you are going to see:" (1) The short bell horn had no seal installed at all. Massive air leak, made a slight mooing sound when subjected to full flow/pressure. (2) The long bell had a dried out, rock hard seal that I had to essentially break and dig out. Someone made a gasket to go between the bell flange and base flange which only served to stand off the back from the bell which prevented the diaphragm from being tensioned at all. A slight mooing sound was all it produced when subjected to full air/pressure. The pictures tell the story.
WabCo B6 rebuilds, continued. Completed short bell machining and found that the diaphragm needed repair. It had a loose counterweight (common problem with these horns) which if allowed to persist would get worse with time, and eventually would cause the diaphragm to crack from the impact forces. It must be disassembled and repaired.
WabCo B6 rebuilds, continued. Here we see the completed B6 short bell and the beginning of the long bell rebuild: Note the "home made" gasket that someone thought would be a good idea, even though all it does is prevent the diaphragm from being properly tensioned in the assembly.
WabCo B6 rebuilds, continued.
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