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mounting DelcoRemy alternator 120-130

uid 17774's pic
posted by  Damian on  Sun Apr 10 11:38 CST 2005
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Looks like I'll be getting a Delco Remy 55 amp alternator for the sedan with a B20 block. I realize that I should probably have special custom made mounting bracket (Ron Kwas product recommended), but I'm wondering if there are other options.

My later B18 currently has similar Delco alternator mounted to the block, but without special bracket. There is a long fat bolt which goes through lower mounting hole on alternator (center of photo), directly into threaded hole in front of engine block. Not sure what the hole in block is for, but never used in any of the blocks I've owned in past.

This setup has worked fine for years now, no wear, no problems. Think there might be any problems mounting my new alternator the same way? Any advice appreciated as always.









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    success! 120-130

    uid 17774's pic
    posted by  Damian on  Wed Apr 13 12:30 CST 2005
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    Picked up alternator this morning, then went to Home Depot for hacksaw and file.

    Took about 20 minutes total to to perform metal surgery, puppy is ready for installation. My 36 month warranty flew away into the clouds after messing with the metal, but I doubt I'll have any problems with alternator. Thanks all for your assistance/ advice. New belt has now been mounted correctly, had been backwards like that for a number of years.








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    mounting DelcoRemy alternator 120-130

    posted by  someone claiming to be patrick of mtl on  Sun Apr 10 16:38 CST 2005 [RELATED]

    I 'moded' my alt to fit. To wit, ground material off the back side so that the pulleys lined up and oversized the bolt hole so that the bolt would fit. You can't trade the core, but these alts should be rebuilt at home anyway seeing as the rebuild kit costs what ? $12.00?








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    mounting DelcoRemy alternator 120-130

    posted by  walrus3 on  Sun Apr 10 12:26 CST 2005
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    last visit: Mon Dec 2 14:20 CST 2013
    [RELATED]

    My guess is that it is a 68 or later B18 block, which is externally very
    much like the B20 block. That is indeed an alternator mounting ear and
    you are doing it right.
    I'll bet your block also has the bolt holes for the lower bellhousing bracket
    for the later bellhousing that has big bolt holes in the lower part rather
    than the 1/4" bolt holes for the tin shield on earlier models.
    --
    George Downs Bartlesville, Heart of the USA!








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      mounting DelcoRemy alternator 120-130

      posted by  Phil S. on  Sun Apr 10 13:26 CST 2005
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      last visit: Fri Oct 24 13:18 CST 2014
      [RELATED]

      Hmmmm... that's how a Bosch alternator mounts, of course, and '66-on B18 blocks have the mounting ear for one. I thought the Delco alt required the SwEm bracket even if the ear was present, though.

      Must go do some measuring tomorrow, although Damian's setup is pretty good evidence that it works fine that way.








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        mounting DelcoRemy alternator 120-130

        posted by  Ron Kwas on  Sun Apr 10 14:01 CST 2005
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        last visit: Fri Oct 24 04:03 CST 2014
        [RELATED]

        Guys;

        I believe the D-R can be mounted to the stock mounting boss intended for the Bosch, but ONLY after the pivot boss on the alt is modified by shortening (details...?), AND having its hole enlarged to accomadate the 3/8" pivot bolt...cobbing it up like that undoutably weakens it pretty good, and just about kills any hopes of trading it in as a core etc. should you ever need to replace it.

        A single ended mounting like that is OK if everything is fine and tight, but I just don't like it because if anything (pivot bolt or belt tension adjusment loosens up) the "overhanging load" condition makes the vibrations (which WILL occur) really BAAAAAD, eventually resulting in a broken off mounting boss....there's just no safety margin....beware Damian!

        Cheers








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          mounting DelcoRemy alternator 120-130

          posted by  Phil S. on  Mon Apr 11 08:54 CST 2005
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          last visit: Fri Oct 24 13:18 CST 2014
          [RELATED]

          You'd have to cut about 1/2" off the rear of the alternator's mounting ear, and drill the hole considerably larger. There's not all that much material to spare there.

          That might be okay with a stock exhaust manifold, but using the SwEm bracket moves the alternator outboard about 1-1/2" and down 1/2", making it much easier to get it away from an aftermarket header. Even with the bracket, it's closer than I'd like to the old IPD header on our Amazon. With a modern 4-2-1, you'd have a real problem if you used the cast mounting boss on the block.








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            mounting DelcoRemy alternator 120-130

            uid 17774's pic
            posted by  Damian on  Mon Apr 11 18:34 CST 2005
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            Thanks for info everybody. No header in the engine compartment, don't plan on ever having one, so that won't be an issue for my particular application.

            Now I just need to figure out proper tool to use to enlarge that hole and shave the metal. It was done very nicely on the alternator currently mounted in the wagon. Not sure if this is something the auto-electrical shop can do for me (don't they have power tools?) or if I need to take the alternator somewhere in particular for the metal surgery.








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              mounting DelcoRemy alternator 120-130

              posted by  mjamgb on  Tue Apr 12 09:07 CST 2005
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              last visit: Tue Sep 4 14:53 CST 2012
              [RELATED]

              Nice to have a power grinder but it can be done with a hand file if you are patient. I did a similar surgery for a different car entirely by taking off the lion's share with a hacksaw and finishing with the file. The hole will enlarge fine with appropriate bit in an electric drill.

              Alternately, swap front covers on the alternators. Look up "Willys one wire conversion" in your search engine for a very nice write-up on alternaor guts with pictures. This way I found out the alternator I was stubbornly trying to wire "traditionally" was in fact a one-wire unit (then wired as he says it works like a charm!).

              Oh, as mentioned, torque on that front bolt will be high so run the belt as loose as you can get away with!

              --
              Mike!








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          mounting DelcoRemy alternator 120-130

          posted by  walrus3 on  Mon Apr 11 02:12 CST 2005
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          last visit: Mon Dec 2 14:20 CST 2013
          [RELATED]

          Is this not the same arrangement used on all B20 and B30 engines?
          If so, the pivot bolt is 1/2"-20 UNF and the boss is plenty sturdy even
          with a spacer between it and the alternator. I had the same thing on the
          engine from a 68 142 (B18) that I bought in Panama. It was JUST LIKE
          a B20 on the outside but had the 3 5/16" bore and a pretty standard B18
          head. It had never been disassembled till I got it.

          I don't think there is anything to worry about here. Looks like a stock
          installation (except for the flatwashers under the bolthead) to me.
          --
          George Downs Bartlesville, Heart of the USA!








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        mounting DelcoRemy alternator 120-130

        posted by  walrus3 on  Sun Apr 10 13:45 CST 2005
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        last visit: Mon Dec 2 14:20 CST 2013
        [RELATED]

        To the best of my knowledge 66 and many 67 blocks DON'T have that ear.

        Mine (164,145) have a 1/2" thick ring with a 1/2" hole in it as a spacer.
        It is a little over an inch OD.
        --
        George Downs Bartlesville, Heart of the USA!







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