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So was the vibration present before the alternator issue?
I am trying to envision how the loose alt would affect alignment?
Absent a problem caused as you suspect by the alternator issue, I would first inspect the prop, the motor mounts, C-Drive mounts, vetus coupling and also the status of the motor.
Regarding motor, no chance that it is not running 100%? Load might make a weak cylinder more evident.
SV Annie SM 37
We are in Gaeta Italy where mechanics are trying to alleviate a mild but distinct engine vibration noted under load. I'd rather not go into how this occurred but suffice it to say that moving a boat a few hundred meters at idle to a travel lift minus the stb forward alternator bracket in place is not a good idea. (bracket was being welded after breaking and landing alt on spinning spline pulley)
Our well intentioned but seemingly flummoxed non English speaking mechanics have us decoupled ( engine/transmission, not marriage) and best I can tell are ruminating on a fix. I absolutely don't want to make matters worse.
Any advice on what to do or advise them or what specifically NOT to do at this point would be greatly appreciated. i think finding someone with significant Amel experience nearby is highly unlikely.
Thanks so much for any advisement.
sv Liesse SN006