Listen to this noise...

Mopar General Discussions

  1. Scanch

    Scanch Active Member

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    I have a ‘64 Signet 200 with a 225 /6. There is a noise that is made when I am in drive or reverse with my foot on the brake. When I give it any gas the sound goes away. Here is a video of my car in drive with the emergency brake on so I could record. It sounds like it is coming from my distributor. My cap was completely worn out so I replaced that, but the problem was not solved. Any ideas would be really helpful!
     
  2. Dragonsteel

    Dragonsteel Well-Known Member

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    Get a wooden dowel rod and place one end to your ear and the other end in various locations on the engine to try and narrow down where the source is.
     
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    • Stephen Mulkey

      Stephen Mulkey FABO Gold Member FABO Gold Member

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      That sounds a lot like the cooling fan touching the shroud, lightly. I'd start flexing things to see if something is loose. How are your engine mounts?
       
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      • Murray

        Murray FABO Gold Member FABO Gold Member

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        I'm thinking flex plate bolts backing out and hitting.
         
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        • 69FBCuda

          69FBCuda Life in the Fast Lane FABO Gold Member

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          Have to worked on it recently?
           
        • AJ/FormS

          AJ/FormS 68 B'cuda fb, Form S clone ... 367/A833/3.55s

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          Sounds like the rotor is slapping the towers; pop the cap and look.
          On second thought, that seems too tinny.
          Second guess is the fuel pump arm not in continuous contact with the driver.
           
        • A56

          A56 MoParAffliction FABO Gold Member

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          ……….and you replaced the rotor as well?
           
        • 66fyssh

          66fyssh Don't Stop Believin' FABO Gold Member

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          I'd say either post #3 or #4. I'd pull the inspection cover from the transmission and check the flywheel bolts. Then leave it off and see if the sound goes away.

          Could something have hit the inspection cover and bent it?
           
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          • Scanch

            Scanch Active Member

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            The towers are the contacts on the cap? I replaced the cap because those were worn down. Checking my replacement cap now it seems they are worn down again and it has only been 50 miles. Almost as if the rotor is too high.
             
          • RustyRatRod

            RustyRatRod Bla de blizhibliz de blatde blizi bla bla FABO Gold Member

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            The frequency is too fast for flex plate bolts. That's distributor speed.
             
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            • Scanch

              Scanch Active Member

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              I am fairly sure it is from the distributor. Any idea why it would only make this noise at idle?
               
            • 318willrun

              318willrun Utube channel 318willrun

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              yep. Too fast for anything spinning crank speed. I'd guess the rotor is hitting the cap on the inside.
               
            • Stephen Mulkey

              Stephen Mulkey FABO Gold Member FABO Gold Member

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              Wow i have never experienced that before. This old dog might get to learn something again.
               
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              • pishta

                pishta I know I'm right....

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                There is a rotor that is .030 longer that is supposed to reduce burning of contacts. Also your cap my not be seated in the groove. You may have the wrong rotor.
                 
              • Scanch

                Scanch Active Member

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                I bought the car a few months back and it has had this noise from the beginning. I am not sure what I should do next. I have the clips that clamp the cap on...wouldn’t that increase the chances of it being seated in the groove? I can’t see any part numbers on anything so I am having even more difficulty.
                 
              • 69383valiant

                69383valiant Not renewing gold membership

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                When was the last time a few drops of oil were put down the shaft under the rotor...
                 
              • pishta

                pishta I know I'm right....

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                can you shoot a pic of the inside of the cap and rotor? The rotor should NOT contact anything 'cept the center coil conductor.
                 
              • TrailBeast

                TrailBeast AKA Mopars4us on Youtube

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                Al the converter bolts would have to be hitting the block exactly the same to make that noise that uniformly. (not likely)
                BUT it could be a bent part of your converter dust cover bent into those same bolts.
                This is actually a lot more common than people think when they remove and replace the cover. (you did say it has always done it)
                Use a hammer handle or something like it (big screwdriver even) and while it's running and making the noise push on the cover in a couple of places and see if the sound changes.
                It's a REALLY easy way to either eliminate or prove the theory.

                Also the crankshaft and converter move a little when the trans is in gear, so the fact that it only does it in gear is kind of a dead giveaway that the noise is converter/dust cover related even if the bolts are not loose.

                I run one of those rotors Napa part number MO300 and you are correct about the .030 longer.
                It would normally rip the cap off if the cap was even slightly off center, and his sound is too uniform I think for it to be that.
                 
                Last edited: Apr 30, 2020
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                • Dicer

                  Dicer Diceman FABO Gold Member

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                  The distributor speed is always half of crank speed. This is because of the timing sprockets and chain, crank sprocket is always half the size of the cam sprocket. the cam gear is always the same size of the distributor drive gear. Hence the distributor shaft speed is always half of crankshaft speed.
                  Me I would pull off the converter shield and check...at least to have a look see...….
                   
                • pishta

                  pishta I know I'm right....

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                  Keep checking that cap and rotor. Could it possibly be an advance weight at idle that swings free when you rev it? It may have lost a shaft bushing allowing it to move up and down under load. Pull it and see if there is more than about .010 axial shaft play. Should be almost nill.
                  s-l640.jpg

                  rotor should swing in under contacts as well as past (step shaped) them so too much axial play would tear up the contacts on top of rotor. See the step? Makr sure rotor is seated. Need them pics!~
                  indcap.jpg
                   
                  Last edited: Apr 30, 2020
                • Stephen Mulkey

                  Stephen Mulkey FABO Gold Member FABO Gold Member

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                  Could the distributor shaft be thrusting up? Are the tower contact metal showing wear? Pictures of the inside cap would be great
                   
                • TrailBeast

                  TrailBeast AKA Mopars4us on Youtube

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                  I think it's too loud and fast to be either of these but hey, it's worth a look.:D
                  Sounds like crank speed and not distributor speed.
                  (but then the converter has 4 bolts and the distributor has eight contacts so...)
                   
                • 69FBCuda

                  69FBCuda Life in the Fast Lane FABO Gold Member

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                  Post up some "good" pictures of the dist w/o cap, inside of cap and rotor
                   
                • Stephen Mulkey

                  Stephen Mulkey FABO Gold Member FABO Gold Member

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                  You know i was reflecting back to the OP when he said he replaced the cap and after 50 miles it looked worn also. That's odd
                   
                • MOPAROFFICIAL

                  MOPAROFFICIAL FABO Gold Member FABO Gold Member

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                  It's the coil firing.. caused by the ignition box , its constantly firing the coil.
                  I've had this happen with a orange box going bad right out of the box..
                   
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