CRANK WOBBLE!! Updated, found problem

Forced Induction Mopar

  1. Coyote Jack

    Coyote Jack Member #55, I'm old FABO Gold Member

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    The car has not been working the way I like it so I did a little investigating. I put on my pulleys to get 10 to 11 lbs of boost and went for a drive. Everything seemed normal until after I gave it a good hit. Nothing to extreme just wide open until after I was in 2nd gear. After that it was like it was down a cylinder. I checked all cylinders and I am getting fire using the water on the header tube method. I started looking around with the car idling and I noticed a wobble in the crank pulley. Is this normal or do I have a real problem? I have a video of it but I can't upload it to the site.

    Jack
     
  2. Coyote Jack

    Coyote Jack Member #55, I'm old FABO Gold Member

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    I think this will work. Here is a link to the video.

     
  3. replicaracer43

    replicaracer43 Grumpy Old Man

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    Hard to tell from that, but it APPEARS the pulley is what is wobbling, ballancer looks to be running true...hard to say without being there in person.
     
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    • RustyRatRod

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

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      I agree. I think the pulley is all that's off track. At least it appears that way.
       
    • Coyote Jack

      Coyote Jack Member #55, I'm old FABO Gold Member

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      Unfortunately that was the best video I could get. The balancer is moving just not as much as the pulley. I am going to take the pulley off tomorrow and check the balancer bolt and stick another pulley on there and check it again. Kind of scared the crap out of me when I saw it.

      Jack
       
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      • ratvon

        ratvon Well-Known Member

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        Take the pulley off see if it still wobbles
         
      • crackedback

        crackedback FABO Gold Member FABO Gold Member

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        crank might be broken or cracked at snout or right behind the first main.

        slow the video down to .25 speed. easier to see the balancer wobbling.
         
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        • Demonic

          Demonic Well-Known Member

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          Do you have a dial indicator and a long stand? Check the crank snout with the balancer off. Might have to spin with the starter, or run the bolt in w a spacer and turn by breaker bar, the better way.
           
        • Rolling_Thunder

          Rolling_Thunder Rolling Thunder

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          I would buy a dial indicator (if you dont have one) and remove everything down to the crank snout... then turn the crank by hand and track if the snout is bent - this would show something wrong with the crank... if it shows true then it's obviously somewhere else... put the balancer back on and repeat the process... then add the spacer... then the pulley... checking each piece as you go --- itll narrow down where the problem is.
           
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          • lilfontleroy

            lilfontleroy annoyinglilLeroy FABO Gold Member

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            aren't the OEM balancers prone to some level of failure at the bonded elastomer where the inner and outer rings are "together"? I wonder if it is failing on you and would a Fluid Damper or ?? be a better option?
             
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            • Coyote Jack

              Coyote Jack Member #55, I'm old FABO Gold Member

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              Unfortunately I didn't get at it today. More pressing matters came up, but I will get at it tomorrow.

              Jack
               
            • Houseoffubar

              Houseoffubar Well-Known Member

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              Good call, at 50 and especially 25% speed, the balancer is clearly moving a lot!
               
            • pishta

              pishta I know I'm right....

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              Youtube troubles lately, any one else see this?
              Screenshot_20200630-142308_Free Adblocker Browser.jpg
               
            • '63GT

              '63GT Well-Known Member

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              As Leroy stated, the elastomer gives out over time one the OE units, and even the performance counterparts require 'rebuilding' to replace the O Rings in the dampers.
              Which is why Fluid Dampers are so popular.
              BTW, if this is the case, and the damper has slipped, the wobble will grow over the length of the pulley. Basically exaggerating the runout.
              The best way to confirm the issue is to put a timing light on it to see if your timing is off from your normal setting.
              Also too, look all the way around the damper to see if rubber is pushing out between the hub and outer ring.
               
            • RustyRatRod

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

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              I'm thinking the same.....I just didn't wanna rain on Jack'a parade.
               
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              • RustyRatRod

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

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                A dial indicator? Seriously? Take all the belts off, grab the crank pulley and if you can rattle it up and down, side to side, the crank's broken. Real simple. Possibly real unfortunate.
                 
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                • Houseoffubar

                  Houseoffubar Well-Known Member

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                  If you watch the video in slow motion it seems pretty clear the inner balancer is wobbling, making the blower pulley really wobble.
                  Sure looks like a bent or broken crank, especially with the running condition
                   
                • pomonamissel

                  pomonamissel Well-Known Member

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                  if the crank is bent , the pulley is way out there . you won't see it wobble with your eye on the damper , its dial indicator time on the damper and rotate the motor by hand . blowers like to crack crank noses off it starts with a bent nose . and are you sure you damper is not taking a sh....t . la's are known for damper to fail to stay in good shape .
                   
                • Coyote Jack

                  Coyote Jack Member #55, I'm old FABO Gold Member

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                  Unfortunately, I have not been able to get at it due to other issues around here. Hopefully in a couple of days. I can say with all belts removed the pulley does not move by hand. I will be able to tell more once I take the pulley off and can see the damper better. I will have a look with the timing light today if I can. It doesn't take long to check it. I don't think the crank has broken yet as all cylinders are firing.

                  Jack
                   
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                  • MiradaMegaCab

                    MiradaMegaCab Well-Known Member

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                    Is the crank forged?
                    Is it double keyed?
                    Is that a stock damper?

                    Was the blower belt too tight?
                     
                  • Coyote Jack

                    Coyote Jack Member #55, I'm old FABO Gold Member

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                    Stock forged crank, single key, stock damper. Blower belt did not appear to be to tight. The only big difference I can figure is that I was running a smaller top pulley and had the boost up to 10 to 11 lbs.

                    Jack
                     
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                    • Coyote Jack

                      Coyote Jack Member #55, I'm old FABO Gold Member

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                      I found a few minutes to look at it this morning and also found the problem. SEE PHOTO My only guess is that when I upped the boost the damper couldn't take the extra stress and failed. Of all the things that could have happened this is definitely not the worst. It cracked the timing cover as well, but I have a spare one of those. The crank seems to be running true so I am not to worried about it. Anybody know where I can get a decent damper quick in Canada?

                      Jack

                      DAMPER002.JPG
                       
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                      • 4spdragtop

                        4spdragtop FABO Gold Member FABO Gold Member

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                        Glad it was only that Jack! I know Summit has free shipping to us Canucks if you spend $300 US??
                         
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                        • Divenut

                          Divenut Well-Known Member

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                          Real happy to see you got her sorted out man. And not catastrophic.

                          Be well,
                          Pat
                           
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                          • Demonracer

                            Demonracer 71 Demon 00 Ram 16 Chrysler 300S 05 Caravan FABO Gold Member

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                            It needs a good SFI balancer Jack.
                             
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