C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Catastrophic Alt bracket failure...WTF???

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Old Nov 15, 2007 | 04:38 PM
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Default Catastrophic Alt bracket failure...WTF???

Why this stuff happens to me, I'll never know

I jumped in the vette the other morning. Started fine, but no power steering. Hmmmm, I pop the hood and I see the serp belt had come undone. It was pouring so I figured I'd figure it out later..probably a pully seized or the tensioner let go. Looked at it today and found that the entire bracket that supports the Alt and Air pump had sheared off!!! Here are some pics..







What would cause this? I'll need to buy a new one. My FSM is packed away so what is this part called?
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Old Nov 15, 2007 | 04:49 PM
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it happens, mine did the same thing but at the top.
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Old Nov 15, 2007 | 05:57 PM
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was there a rear alt. support installed similar to the stock peice to support the rear of the alt.?
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Old Nov 15, 2007 | 06:09 PM
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One side of the bracket on my 87 cracked. I bought a used one.
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Old Nov 15, 2007 | 06:28 PM
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I had the same thing happen on my 90, but it was the ac compressor bracket. Funny thing is i never lost the belt! I ended up with a high rpm vibration, and thats how i found it!
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Old Nov 15, 2007 | 06:31 PM
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Holy crap, I just noticed it took the top of the alt. housing with it!
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Old Nov 15, 2007 | 06:35 PM
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Originally Posted by mseven
was there a rear alt. support installed similar to the stock peice to support the rear of the alt.?
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Old Nov 15, 2007 | 06:50 PM
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I believe all stock pieces were there but I will double check. This thing sheared every mount point. The bottom of the alt was pulled apart. I'll have to search the archives for good alt recommendations. This is turning out more expensive then I had envisioned
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Old Nov 15, 2007 | 06:54 PM
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If cost is an issue, just weld it all back together. If you don't have one usually a neighbor will do it for $20 or beer.
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Old Nov 15, 2007 | 06:54 PM
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I am not sure if I have the rear bracket that you are referring to: Here's an engine pic:

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Old Nov 15, 2007 | 06:58 PM
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ah, I found it. I guess I should get one of these
http://ecklers.com/product.asp?pf_id=30242&dept_id=1198
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Old Nov 15, 2007 | 06:59 PM
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Kinda hard to tell, it dosesnt look like its there. It would be near the lower part of the alt, where the pic ends.
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Old Nov 15, 2007 | 06:59 PM
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I broke one a few years ago; my rear brace (home made) broke and I put off replaceing it a little too long... with similar results. Got a used one from Vette-To-Vette parts.

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Old Nov 15, 2007 | 06:59 PM
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Originally Posted by jerkyboy
ah, I found it. I guess I should get one of these
http://ecklers.com/product.asp?pf_id=30242&dept_id=1198
Yup, thats it!
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Old Nov 15, 2007 | 07:07 PM
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I circled it!

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Old Nov 15, 2007 | 07:08 PM
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It would be easy to fab something out of flat stock for free.
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Old Nov 15, 2007 | 07:10 PM
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Originally Posted by Aardwolf
It would be easy to fab something out of flat stock for free.
Which may HAVE to be done anyway, by the looks of those headers.
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To Catastrophic Alt bracket failure...WTF???

Old Nov 15, 2007 | 07:37 PM
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Thanks guys. Yeah, not sure how I could get the stock part to work. I'll try to fab (or have) something fabbed up.
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Old Nov 15, 2007 | 08:39 PM
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Originally Posted by jerkyboy
Thanks guys. Yeah, not sure how I could get the stock part to work. I'll try to fab (or have) something fabbed up.
if those are hookers the stock one won't work, you will have to make one. The stock one is intended to go to #1 cylinder 2nd bolt, w/hkr. headers that won't fit anymore. You will have to use the bolt before cylinder #3 and use an extension tube to clear the header. I made mine w/1/2" x1/16" wall mild steel tubing (see my pics). Not that big of a deal to make....just a little time and a few bucks for some steel tubing.

Last edited by mseven; Nov 15, 2007 at 08:42 PM.
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Old Nov 15, 2007 | 08:41 PM
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A lot of guys that install headers find that the support bracket that originally attached to the OEM exhaust manifold and the alt, just left it off. GM put it there for a reason.
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