Door "Cracking"?

1971 - 1974 Mopars

  1. Dibbons

    Dibbons Well-Known Member

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    I found these four comments on a '71-'72 Road Runner forum and I am not even sure what they are talking about, not my experience anyway:

    "Ok, I'm curious, on doors, is a crack in the metal by the mirror common? I'm guessing maybe so? Fatigue from weight of door?"
    "Extremely common"
    "every 71 B I've owned has had it"
    "Both 71s I owned first the crack then upper door hinge came loose."
     
  2. moparmarks

    moparmarks Well-Known Member

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    Fairly common I would say. I've owned a lot of these cars and only had a few with the crack.
     
  3. Z-Man

    Z-Man FBBO Gold Member FBBO Gold Member

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    My passenger's door on my 71 GTX needed a weld there. The doors are heavy.
     
  4. plymouthman72

    plymouthman72 Well-Known Member

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    My 73 had it bad on both sides but my 72 didn't.
     
  5. 73PlyRR

    73PlyRR Active Member

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    My 73 has them on both doors
     
  6. YY1

    YY1 Well-Known Member

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    Interesting.

    I have my 73- no cracks

    72 Charger- no cracks

    71 parts car- no cracks

    Doors from a 74 Charger- no cracks

    One door from another 74 Charger- no cracks

    Maybe I'm not looking in the right place?

    Where are they in relation to the hinge?
     
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    • BAFRAID

      BAFRAID She getting closer. FBBO Gold Member

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      My 69 coronet door had cracks around the bolt holes where the striker mechanism goes on.
       
    • Z-Man

      Z-Man FBBO Gold Member FBBO Gold Member

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      My split was on the short curve just before the fender.
       
    • fratzog lover

      fratzog lover Well-Known Member

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      Anyone have pics of this phenomenon?
       
    • moparmarks

      moparmarks Well-Known Member

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      I'll see if I have a cracked door.
       
    • Bb70charger500

      Bb70charger500 FBBO Gold Member FBBO Gold Member

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      Got to agree with yy1 never had any with cracks!
      Maybe if there from a place that gets cold and hot alot? Not sure how Mexico is on temp in fl everything is hot
       
    • 71GTXFY1

      71GTXFY1 Member

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      Possibly stress fracture from hinge roller and over-center rod sticking. The roller and over-center rod on my driver's door hinge would not budge when trying to shut the door. Liberal application of lithium grease to what I could get to on the internal surface, and a finger tip of axle grease to the rod end surface and it finally let up.
       
    • butterscotch71

      butterscotch71 Well-Known Member

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      I was one of the replys you quoted, and here's one of mine (original paint car)

      crack.jpg
       
      Last edited: Jan 18, 2021
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      • YY1

        YY1 Well-Known Member

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        I can honestly say I have never seen that before in over 35 years.
         
      • moparmarks

        moparmarks Well-Known Member

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        I've had more doors without the crack but have had a few with it.
         
      • butterscotch71

        butterscotch71 Well-Known Member

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        I think it's an issue of how the sheetmetal is stretched in that area because of the curve and the fact that it probably flexes when the door is opened. My B7 car (pictured) has it on the passenger side and my butterscotch car has it on the drivers door.
         
      • butterscotch71

        butterscotch71 Well-Known Member

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        another

        crack2.jpg
         
      • MoparJimT

        MoparJimT Member

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        Both my door cracked in the same spot. Had to weld them during the bodywork stage of restoration. 20181022_173902.jpg
         
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        • Dibbons

          Dibbons Well-Known Member

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          Those photos in post #13 and #18 looks like the exact area that would bump into the drip rail molding when you close/slam the door.
           
          Last edited: Jan 31, 2021
        • Photon440

          Photon440 FBBO Gold Member FBBO Gold Member

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          Oddly enough, I have a 1972 Cutlass sitting in my barn with a door crack in the same place. Must be stresses from the hinge area directed in that spot.
           
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