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I was playing around with the GM SI alternator and figured an easy, painless, way to use the original bracket.
I am sure a few would like to know how I did it so here's the write up.
First thing I did was look to see how different the lower mounts were. There's enough of a difference so that you can't just put the alternator into the factory bracket but as you see from the following pictures, not so much that it's not doable.
I first measured the position of the pulley vs the lower mount on the alternator.
I discovered that the back part lines up within a few thousands of an inch but the front was shorter on the GM alternator by approximately 0.2 inches
I figured if I have the right shim in place then I could just space the front and everything would be cool, right?
So now I fitted the bracket to the alternator to see if the mount clears the housing.
With the factory bolt it would but there was never going to be a situation where it would fit centered in the hole. This could cause problems down the line.
So, still using the factory bolt, I utilized the fact that the mount had been sprayed black and moved it a few times to see how much, and where, it was binding.
I then observed that there would be plenty of meat left on the bone if I ground it down to clear with a centered bolt. I ended up grinding off about .050" of the mount to clear. The alternator housing has a slight angle to it so one side needs to be ground more than the other.
I am sure a few would like to know how I did it so here's the write up.
First thing I did was look to see how different the lower mounts were. There's enough of a difference so that you can't just put the alternator into the factory bracket but as you see from the following pictures, not so much that it's not doable.
I first measured the position of the pulley vs the lower mount on the alternator.
I discovered that the back part lines up within a few thousands of an inch but the front was shorter on the GM alternator by approximately 0.2 inches
I figured if I have the right shim in place then I could just space the front and everything would be cool, right?
So now I fitted the bracket to the alternator to see if the mount clears the housing.
With the factory bolt it would but there was never going to be a situation where it would fit centered in the hole. This could cause problems down the line.
So, still using the factory bolt, I utilized the fact that the mount had been sprayed black and moved it a few times to see how much, and where, it was binding.
I then observed that there would be plenty of meat left on the bone if I ground it down to clear with a centered bolt. I ended up grinding off about .050" of the mount to clear. The alternator housing has a slight angle to it so one side needs to be ground more than the other.
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