Out put shaft

[Smokie Reynolds]

Hi looking for more information on the out put shaft failure. I have removed the sump and found bearing remains but also aluminium shavings so now wondering if the normal bearing that fails is in the rear housing

 

[Kevin frazier]

The “normal” bearing i believe you are referring to is the bearing that was installed backwards on the torsional damper, on the first rockets out. Depending on your year this has been resolved. You can pull torsional damper to look at it, i doubt thats the issue with this engine looking at debris field, but regardless that engine will need to be opened up.The output shaft you mentioned is the transmission shaft that drives torsional damper and it could be damaged as well.

 

[monala]

If you’re finding both bearing fragments and aluminum shavings in the sump, it unfortunately sounds like the failure may have progressed beyond just the commonly discussed torsional damper bearings. The early backwards-installed damper bearing issue is well known on some Rockets, but aluminum debris usually suggests a housing, carrier, or shaft has started getting damaged as well, possibly from the bearing coming apart and allowing things to run out of alignment. At that point it’s definitely worth inspecting the rear housing, output shaft area, and torsional damper assembly closely because once bearings disintegrate the debris can travel everywhere through the engine.