Reluctanse
I'm Awesome
First pump failed exactly the same way as the next 2, cracked through on the ear near the block, at about 4k rpms.Ok, but how did the first pump go bad? It didn't crack or explode did it? If it was a leak, I wouldn't think that to be out of the ordinary. What was the different setup for the others? I assumed it was what you had pictured with the air pump gone.
This is the first pump, both Duralast's failed in exactly the same spot. When this happened, I was still on the belt setup that was on the truck when I bought it.
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I think actually the autozone pumps might have better castings.... the first duralast didn't actually crack, which is partly why this took me so long to figure out. It was just starting to separate there when I figured it out and pulled it. The 2nd duralast cracked EXACTLY as the above picture, and pretty fast. The napa pump exploded spectacularly almost immediately.
To the rest, I'm going to start hunting for the correct alternator bracket so i can use the federal style tensioner and routing. I wanted to do this anyways. I don't think it's the root of my issues but I will be doing some thorough step by test testing to make sure.... If I can't find one any time soon I might put the air pump back on, as much as that pains me, but we'll see. I really don't think this is the problem.
For that alt bracket, i see lots even reprods that say they fit the 4.3/5.0/5.7, but none listed for the 7.4. Internet searches/google seems more retarded than ever these days and it's all promoted ads when I search for anything. I'll keep digging, but right now I can't even find the part number for the 7.4.
Maybe one of you wizards knows if the small block vortec bracket is the same-