Large O ring on dizzy? Rubber or other

Discussion in 'Slant 6 Engines' started by gdizzle, Nov 25, 2017.

  1. gdizzle

    gdizzle Well-Known Member

    Messages:
    798
    Likes Received:
    85
    Joined:
    May 25, 2015
    Location:
    los angeles
    Local Time:
    8:12 PM
    I just removed and replaced the Electronic Dizzy on my Slant 66 dart. The hold down bar seems to be held (lightly) in place by a large O ring. This O ring is very hard, and has a crack in it. My questions: Is this supposed to be a rubber O ring? Or a hard o Ring (like metal). Then there is also a small narrow slot on the shaft that has a thin rubber O ring, which is rubber. But it is much narrower that the actual slot. Is the wrong size?? BTW this dizzy is a 1970s Chrysler NOS with vacuum pod.
     
  2. slantsixdan

    slantsixdan =..=

    Messages:
    5,780
    Likes Received:
    824
    Joined:
    Jan 7, 2007
    Location:
    Vancouver BC
    Local Time:
    6:12 PM
    The large O-ring doesn't hold the hold-down plate; that plate is held to the distributor with a bolt and to the block with another bolt. The large and small rubber (yes, they're rubber) O-rings are oil seals. The small O-ring being narrower than the distributor shank groove is normal.

    Sounds like you're due for new O-rings. Use good quality, oilproof ones. If you can find an auto parts store with a good selection of air conditioning O-rings (often green or blue) you can usually find the sizes you need.
     
    • Agree Agree x 1
    • odcics2

      odcics2 Well-Known Member

      Messages:
      122
      Likes Received:
      7
      Joined:
      Jul 30, 2013
      Location:
      MoTown
      Local Time:
      9:12 PM
      "dizzy"... lol...
       
    • dukeboy_318

      dukeboy_318 Get off my lawn!!! FABO Gold Member

      Messages:
      20,706
      Likes Received:
      5545
      Joined:
      Jan 19, 2007
      Location:
      la la la la
      Local Time:
      9:12 PM
    • cdnEHbody

      cdnEHbody Well-Known Member

      Messages:
      297
      Likes Received:
      58
      Joined:
      Oct 24, 2015
      Location:
      regina sask canada
      Local Time:
      8:12 PM
      Be aware, dorman chevy ones are close, but not quite the right size...leaky!
       
    • halifaxhops

      halifaxhops 1st instigator, Wives hate me everywhere! FABO Gold Member

      Messages:
      35,802
      Likes Received:
      7525
      Joined:
      Jan 20, 2014
      Location:
      CENTRURAL, PA
      View My Photos
      Local Time:
      10:12 PM
      there ARE TWO SIZES ON 1/8 AND THE OTHER 3/32 you can tell by the grove size one is wider, the bigger o ring will fit but you will prob have a ground issue.
       
    • gdizzle

      gdizzle Well-Known Member

      Messages:
      798
      Likes Received:
      85
      Joined:
      May 25, 2015
      Location:
      los angeles
      Local Time:
      8:12 PM
      Great info guys. So right now I have a big thick (hardened) Oring which presses up against the hold down strap. Then on the shaft there is a groove, and in that groove sits a very thin oring, much thinner than the groove itself. I have never seen colored O rings at the Auto store, just the black ones. I have never seen any oil on the Large O ring, nor have I ever seen any oil leak from the distrib.
       
    • 89.Fifth

      89.Fifth Member

      Messages:
      12
      Likes Received:
      2
      Joined:
      Jun 10, 2016
      Location:
      New York
      Local Time:
      9:12 PM
      I used a very careful application of black RTV and made a contour shape using my finger to get the Dist to seal properly. Let it dry unmounted first and then install. No issues 10 years later.
       
    • nm9stheham

      nm9stheham Well-Known Member

      Messages:
      7,716
      Likes Received:
      1049
      Joined:
      Dec 20, 2013
      Location:
      Waynesboro, VA
      Local Time:
      9:12 PM
      Air conditioning sealing O-rings are normally lighter colors.
       
    • BillGrissom

      BillGrissom Well-Known Member

      Messages:
      6,886
      Likes Received:
      224
      Joined:
      May 10, 2009
      Location:
      Sacramento
      Local Time:
      6:12 PM
      Standard black O-rings are termed "nitrile" or "Buna-N". It resists oil, but not gasoline. Turns hard over time with enough heat. AC type are HBNR and come in various colors (grn, red, blu) though trying to standardize on green. They are tougher and handle heat better and I think are better than nitrile for most all applications. Viton are usually dark brown. They resist gasoline and last longer than nitrile. They cost more and are hard to find in larger sizes. Harbor Freight sells kits for each type (english & metric for nitrile). Your life will be easier if you buy each kit.
       
    • slantsixdan

      slantsixdan =..=

      Messages:
      5,780
      Likes Received:
      824
      Joined:
      Jan 7, 2007
      Location:
      Vancouver BC
      Local Time:
      6:12 PM
      Nix on the Harbor Freight suggestion. I'm sure they do sell different-color O-ring kits claiming to be various different materials, but in reality everything they sell is Chinese garbage that doesn't come close to being what it claims to be. Do yourself, your wallet, and your cars a big favor and don't slog through that sewer.
       
      • Agree Agree x 1
      • BillGrissom

        BillGrissom Well-Known Member

        Messages:
        6,886
        Likes Received:
        224
        Joined:
        May 10, 2009
        Location:
        Sacramento
        Local Time:
        6:12 PM
        I guess someone could run a test, soaking the Harbor Freight "viton" and "nitrile" O-rings in gasoline for a month. Seems I recall seeing where someone did that. I doubt they misrepresent the product and most HF products I bought have served well and most I would never have bought at Snap-on prices. Re Chinese, I bought 1/8" viton tubing for my M-B diesel injector return hoses off ebay. It has held up fine for over a year and I use bio-diesel (Propel HPR) which is more aggressive. It seems to truly be viton since everyone who has tried regular black vacuum hose (nitrile) found it swells in a week, even w/ regular diesel, and I saw that when I tried a little silicone hose "just to verify".
         
      • Charrlie_S

        Charrlie_S Well-Known Member

        Messages:
        2,047
        Likes Received:
        148
        Joined:
        Oct 17, 2005
        Location:
        Silver Springs, FL
        Local Time:
        9:12 PM
        Last edited: Dec 9, 2017 at 12:11 PM
        • Agree Agree x 1
        • halifaxhops

          halifaxhops 1st instigator, Wives hate me everywhere! FABO Gold Member

          Messages:
          35,802
          Likes Received:
          7525
          Joined:
          Jan 20, 2014
          Location:
          CENTRURAL, PA
          View My Photos
          Local Time:
          10:12 PM
          I am lost on the o ring by the hold down clamp, between the plate and the distributor?
          3588dj5.jpg
           
        • halifaxhops

          halifaxhops 1st instigator, Wives hate me everywhere! FABO Gold Member

          Messages:
          35,802
          Likes Received:
          7525
          Joined:
          Jan 20, 2014
          Location:
          CENTRURAL, PA
          View My Photos
          Local Time:
          10:12 PM
          hmm NEVER EVEN NOTICE THIS, EARLY DIST? @slantsixdan ? Don't think I ever came across a core with it usually just the small one.
          pict0003-jpg.jpg
           
        • halifaxhops

          halifaxhops 1st instigator, Wives hate me everywhere! FABO Gold Member

          Messages:
          35,802
          Likes Received:
          7525
          Joined:
          Jan 20, 2014
          Location:
          CENTRURAL, PA
          View My Photos
          Local Time:
          10:12 PM
          A member I think here did a great thread on different fuses and when they they actually blew, some were way out of specs, really scarry.
           
        • slantsixdan

          slantsixdan =..=

          Messages:
          5,780
          Likes Received:
          824
          Joined:
          Jan 7, 2007
          Location:
          Vancouver BC
          Local Time:
          6:12 PM
          That thread is here. Also see here.

          Halifaxshops, it's probably staring me in the face, but what are you asking me to notice about one or the other distributor in your pic, aside from one having and one not having the large O-ring?

          Anyhow:

          Chrysler P/N for the top O-ring is 2095 740, discontinued, and the inner diameter is 1.068". Buna-N is an acceptable material. Find it around as a "size 121 round O-ring", such as here (a hundred of them for under ten bucks) or here (one for 35¢, but shipping will probably make it more worthwhile getting the 100-pack, then when the end of the world comes you'll be prepared).

          Chrysler P/N for the bottom O-ring is 2095 630, discontinued, and the inner diameter is 0.920". I'm pretty sure it's a size 021 square O-ring such as this (where you can also read about Buna-N material's characteristics), though it's been long enough since I scrutinized one of these that my recollection of them as square-section could be wrong—they might well start out as round and the outer diameter gets squished flat with pressure, heat, and time. Also possible it's an 020-size ring (outer diameter 1.004") or an 022-size ring (outer diameter 1.129").

          These size numbers apply whether you're getting round- or square-section O-rings, so google searches are easy.
           
        • Killer6

          Killer6 Well-Known Member

          Messages:
          1,815
          Likes Received:
          470
          Joined:
          Mar 9, 2015
          Location:
          PA
          Local Time:
          8:12 PM
          There are many different colored o-rings, but they aren't part of a std. "kit". Some are different materials for different temp. & fluid compatibility, others are coated to help
          ease of assembly. Look at some stock applications like fuel line quick connect fittings, they often have a mix of black,brown, or yellow o-rings. The yellow ones are almost
          always the "back-up" ring, i.e. the first one You see inside, but the second one fuel would see trying to leak, that yellow is a coating that will come off if You try. A/C ones
          can be green, blue, orange(also used in water fittings, and vapor/intake fittings), primarily green....and it is a coating to ease slipping the connections together.
           
        • halifaxhops

          halifaxhops 1st instigator, Wives hate me everywhere! FABO Gold Member

          Messages:
          35,802
          Likes Received:
          7525
          Joined:
          Jan 20, 2014
          Location:
          CENTRURAL, PA
          View My Photos
          Local Time:
          10:12 PM
          Dan, Just I don't actually remember seeing that large O ring, is it just certain applications?
           
        • slantsixdan

          slantsixdan =..=

          Messages:
          5,780
          Likes Received:
          824
          Joined:
          Jan 7, 2007
          Location:
          Vancouver BC
          Local Time:
          6:12 PM
          Every Slant-6 distributor needs one large and one small O-ring, and that's how every Slant-6 distributor was factory-installed, from the first one in 1959 to the last one in 1987. O-ring part numbers stayed the same that whole time, too.
           
        • halifaxhops

          halifaxhops 1st instigator, Wives hate me everywhere! FABO Gold Member

          Messages:
          35,802
          Likes Received:
          7525
          Joined:
          Jan 20, 2014
          Location:
          CENTRURAL, PA
          View My Photos
          Local Time:
          10:12 PM
          Seriously don't think I ever had a core with one, thanks have to get some then.
           
        • gdizzle

          gdizzle Well-Known Member

          Messages:
          798
          Likes Received:
          85
          Joined:
          May 25, 2015
          Location:
          los angeles
          Local Time:
          8:12 PM
          thanks for all the comments. Update: So I took the old Oring down to Oreilys, the Dorman selection had 1 opened pack of Misc Orings, supposed to be a 12 pack of assorted, there were 4. There was also a special "Distributor" package with 6 oRings, some black and some Tan. Those were too small. So I went to the counter to complain about the lack of Oring selection, when he pulled out a red case , opened it and there was a nicely laid out selection of Orings. I found the right one (a little thinner than what I had, but the right size), he rang me up $2.20...for 1 oRing. Installed and no leaks.