Derek;
You are right of course...I believe that is just remaining evidence, that the pivot bolt was threaded where it went through the housing and vibrated against the inside wall cutting its threads into it...if I look carefully at the threads, the threads look like they are not even in-line with the alt armature...just more evidence of shoddy design and workmanship...the person who did that should maybe stick to video games!
dgbalfour; Cracked housings are inevitably a result of vibration which occurs with sloppy mounting...even with an unmolested housing this can occur...alternators are meant to be pivoted in order to tension belt, the LOCKED in place...at the pivot and tensioning bar...if there is relative movement of any kind, something WILL eventually fatigue and break as a result...
Cheers
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