My LLW Alternator that I replaced just had a semi-failure.
The Case screws that hold the body together had a strippage from the re-builder.
One of the Case screws backed out due to strippage and started to hit the Alternator fan.
A 4.5mm Nut wasn't replaced on the screw on the back, so I added 3 more to prevent this from happening.
So if you get a replacement alternator, be sure that you use 4.5 mm nuts and lock washers to the back of the case bolts to prevent this from happening to you.