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25% ud pulley belt rubs on alternator bracket lower bolt

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Old 10-06-2012, 06:59 PM
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Default 25% ud pulley belt rubs on alternator bracket lower bolt

Using a ati 25% ud pulley stock fbody alternator bracket and alternator the belt rubs or touches the lower bracket bolt. What do you guys do for a fix? Any one else have this problem? I've searched and herd about one guy grinding his bolt down.

Old 10-06-2012, 07:02 PM
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Your belt routing is wrong. Needs to go to the idler pulley between the crank and alternator.
Old 10-06-2012, 07:07 PM
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No p/s pump.
Old 10-06-2012, 07:11 PM
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Old 10-06-2012, 07:12 PM
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The belt now goes on the other side of that idler
Old 10-06-2012, 08:25 PM
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Can you put a ribbed idler above the alt?

Doesnt look like its rubbing very much you may be able to get buy with it. OR go to someplace with bolts and get the correct length bolt the head wont stick out as far and wont rub.
Old 10-06-2012, 09:43 PM
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a flat headed allen bolt?
Old 10-07-2012, 12:42 AM
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M10 x 1.5 x 125mm and it needs at least 25mm threaded, also a head OS diameter of 22.3mm. In that length/size you'll probably only find it in a Socket Head Cap Screw.

I think you'd be good just clearancing it with a file, or Dremel tool with a sanding drum.

....or....with a larger diameter Alt pulley; Alper has them.

Last edited by 99Bluz28; 10-07-2012 at 12:59 AM.
Old 10-07-2012, 06:35 PM
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The idler pulley is ribbed, this is just a older picture I had. The only m10x1.5x125 allen bilt I can find is from mcmastercar
Old 10-07-2012, 06:53 PM
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could relocate the alternator with the KWIK relocation bracket. It would mount it on the top right, near the driver side cylinder head.
http://www.kwikperf.com/lsx_alt_ps.html

I found this thread too that I remember reading about, also showed up on the nasaforums sometime ago.

Look at the picture in the last post (better contact area for the water pump too

https://ls1tech.com/forums/conversio...cessories.html
Old 10-08-2012, 01:36 AM
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Originally Posted by bad6as
The idler pulley is ribbed, this is just a older picture I had. The only m10x1.5x125 allen bilt I can find is from mcmastercar
Yeah, that where I found it to.



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