1100694 alternator with to big hole? - NCRS Discussion Boards

1100694 alternator with to big hole?

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  • Hans R.
    Frequent User
    • March 1, 1976
    • 91
    #1

    1100694 alternator with to big hole?

    I bought a 1100694 55A alternator for my -66 A/C Corvette. When I try to install it, it turns out that the hole for the pivot (long) bolt, which attaches to the exhaust manfold, is to big. It's about 1/2 inch in diameter.
    The previous alternator I had in the car has a hole that is about 3/8 inch (the same for a few more alternators I have).
    Can anyone explain why this alternator has such a big hole. According to the p/n it should fit in my car.

    I'm attaching pictures of the alternator hole and p/n. Also a picture of the hole in my previous alternator.
    Attached Files
    Hans Ryden #868
    Tags: None
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    • Wayne M.
      Expired
      • March 1, 1980
      • 6414
      #2
      Re: 1100694 alternator with to big hole?

      Originally posted by Hans Ryden (868)
      ...Can anyone explain why this alternator has such a big hole. According to the p/n it should fit in my car....
      Hans -- all I can think of is that someone had drilled the lower mount hole, for some unknown reason, as the factory bolts are nowhere that large.

      Possible solution is to add two of those (split) sleeves that are used for the lower alternator bracket on the '63-5 cars ('64-5 w/no C60) and some '66-7 BB's (those w/o N40, I think). These are 3/4" long and have an OD of 1/2" with ID suitable for the long factory bolt (5/16" ?).
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        • Joe L.
          Beyond Control Poster
          • February 1, 1988
          • 43193
          #3
          Re: 1100694 alternator with to big hole?

          Originally posted by Wayne Midkiff (3437)
          Hans -- all I can think of is that someone had drilled the lower mount hole, for some unknown reason, as the factory bolts are nowhere that large.

          Possible solution is to add two of those (split) sleeves that are used for the lower alternator bracket on the '63-5 cars ('64-5 w/no C60) and some '66-7 BB's (those w/o N40, I think). These are 3/4" long and have an OD of 1/2" with ID suitable for the long factory bolt (5/16" ?).


          Wayne and Hans------


          I'd say that's definitely what happened. I don't know that any of these DN series alternators ever used a 1/2" pivot bolt. However, if any did, they would have had a part number which differed from 1100694. So, for some unknown reason, someone over-bored the hole. Original pivot bolts were 3/8".
          In Appreciation of John Hinckley
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            • Hans R.
              Frequent User
              • March 1, 1976
              • 91
              #4
              Re: 1100694 alternator with to big hole?

              Thanks Wayne and Joe.
              I've been in contact with the guy I bougth it from, Ken Bruno, and he promised to get me a new alternator with correct hole
              Hans Ryden #868
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