not good, need some help fellas!
#16
#17
#18
#19
Hmm, I was expecting the break, at least on one side, to be _through_ one of the p/s pump bolt holes. So, referring to your second pic, which hole had the sheared-off bolt? If it was the top one, closest to the vac pump, I can see how/why the bracket cracked; all the weight of the pump and the force of the belt was on the two lower bolts, on that outer loop section of the bracket. I'm no structural engineer, but it seems like a design fail. If they had to be limited to three bolts to hold the pump, there should have been two on the more "central" part of the bracket, and just one on the outer loop.
#21
madpogue,
Excellent questions and points! The sheared off bolt was indeed the bolt at the 1:00 position! Never found the head, but the rest of the bolt I had to remove out of the power steering pump.
Anytime bolts loosen, it changes stress point locations dramatically. As the bolts are tightened down, friction distributes the stresses evenly.
I think the design is ample, until things loosen up. This is indeed a heavy heavy vehicle.
Why they chose aluminum is perplexing to me. Possibly due to the motor design and bolt hole options into the front of the motor? Possibly 4 holes may not have been sufficient to hold more weight??? A steel bracket would have been substantially heavier.
Excellent questions and points! The sheared off bolt was indeed the bolt at the 1:00 position! Never found the head, but the rest of the bolt I had to remove out of the power steering pump.
Anytime bolts loosen, it changes stress point locations dramatically. As the bolts are tightened down, friction distributes the stresses evenly.
I think the design is ample, until things loosen up. This is indeed a heavy heavy vehicle.
Why they chose aluminum is perplexing to me. Possibly due to the motor design and bolt hole options into the front of the motor? Possibly 4 holes may not have been sufficient to hold more weight??? A steel bracket would have been substantially heavier.
#22
#23
That's crazy it broke like that. I wonder if there was a crack from something - like maybe someone using the bracket to pry against or something. And, over time it just worked itself bigger and bigger until it broke. If it was just the fact that it is aluminum and these trucks are heavy, then you would think this would be posted more often as a problem.
Glad you are back up and running. That 4th bolt on the bracket is a bugger to see. Had me stumped for a while too!
Glad you are back up and running. That 4th bolt on the bracket is a bugger to see. Had me stumped for a while too!
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