alternator bracket bolt size

General Mopar Tech Discussions

  1. ksurfer2

    ksurfer2 Well-Known Member

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    OK, this seemed like it would be a easy job, replace the alternator on my 440. Picked up a replacement last night from Napa, started install after lunch today, figure it would be an hour job, tops. Everything went on fine until I attempted to install the tension bracket. The 5/16 X 18 bolt that was in the alternator that I took off was a smidge too small. I tried a different bolt (same size), same issue. I brought the alternator back to Napa thinking the holes may have been stripped and swapped it out for a different one. New alternator, same problem. Tried a metric bolt that was a teeny bit bigger, still not big enough to tighten properly. Next size bigger bolt in both standard and metric are too big. Before I helicoil, is there a special bolt that I should be using? Nothing came with the alternator.
     
  2. beanhead

    beanhead Well-Known Member

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    Soft aluminum housing. My 'Napa' replacement alternator stripped as well, before I got the bolt close to tight. Drilled and tapped it to 3/8 no problem..I tightened the top bolt real good and then went reeal slow on that bottom bolt.
     
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    • PurpleBeeper

      PurpleBeeper Well-Known Member

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      Poor quality manufacturing. There is no "special bolt". Guessing metric was a good idea though.
       
    • 5.7 hemi

      5.7 hemi FBBO Gold Member FBBO Gold Member

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      Put a heli-coil in it and never worry about it again.
       
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      • ksurfer2

        ksurfer2 Well-Known Member

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        Yup, that is what I did. Problem solved. Just surprised me that both tension bracket holes on two different alternators were f-ed up.
         
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