RE: Alternator Bracket Bushing
I have a question if the engine is firmly mounted how is it vibrating?
How the engine is mounted is not the problem , the vibration is caused by the power pulses adding and subtracting twisting force to the crank, which absorbs and releases the force ,.
That makes for a torsonial vibration that can EAT the crank.
As noted its a service item (in time) just like an oil filter , oil pump, pan gasket or injector set.