Harmonic damper installation

Discussion in 'Magnum Engine Swaps' started by Peyote, Aug 6, 2018.

  1. Peyote

    Peyote Well-Known Member

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    Hi all, I got my damper from Professional Products installed, but I’m wondering if it’s not all the way on. It seems to suck out from the block, but I’m not sure if that’s correct. Thoughts?

    Thanks!

    image.jpg
     
  2. Ottmundr

    Ottmundr 68 Fastback

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    I would double check the torque and see if the pulleys line up. If I remember right, on the back of the HARMONICA that came off my 360, there was some sort of stamped sheetmetal shield. I'll get pics when I get home tonight.
     
  3. Bobzilla

    Bobzilla Well-Known Member

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    Definitely not on all way. It looks like the crank keyway got stuck, or it is not lined up properly.
    I would suggest removing the balancer and checking the woodruf key itself for signs of damage.
     
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    • Peyote

      Peyote Well-Known Member

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      So the damper has a lip 1/4 of the way through it, at the lip the inner diameter narrows. So the crank would never make it past that point. I assume that’s as far as it is supposed to go

      image.jpg
       
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      • xLURKxDOGx

        xLURKxDOGx "An angel fat, at satan's feast"

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        Got about 5/8 to go. Keep wrenching.


        Jake
         
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        • sireland67

          sireland67 Well-Known Member

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          Some aftermarket balancers you have to ream to fit.
          I used a PP SFI one and it slid right on my factory 96 5.9 crank.
           
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          • brian6pac

            brian6pac Well-Known Member

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            I had a aftermarket damper that was way off, had to have a machine shop hone it to the right size.
             
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            • Peyote

              Peyote Well-Known Member

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              Really? I mean the part where is narrows is very subtle, maybe 1/32”, but you just keep going with it?

              I’m positive that the first time I put it on I tightened it down to 130 ft-lb. To get it over the lip would require more torque than what’s recommended to use as the final torque spec.
               
            • xLURKxDOGx

              xLURKxDOGx "An angel fat, at satan's feast"

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              Maybe not exactly 5/8 but you’ve got a ways to go. I have that same one on my 360 magnum, I’ll get a picture for you.

              Jake
               
            • sireland67

              sireland67 Well-Known Member

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              Pull the balancer off, mic the crank and the balancer, the problem will be easy to find.
               
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              • brian6pac

                brian6pac Well-Known Member

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                Mic the crank, mic the balancer, should only be a couple thou difference
                 
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                • SGBARRACUDA

                  SGBARRACUDA ROY FABO Gold Member

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                  Some aftermarket balancer's are way to tight. They need honing to get a tight but not impossible fit. Fluid Damper brand are way to tight out of the box.
                   
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                  • Peyote

                    Peyote Well-Known Member

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                    Ok so od of the crank is 1.526

                    Inner diameter 1 of the balancer is 1.558

                    Inner diameter 2 is 1.526-1.5265

                    On paper that looks good but is that in fact too tight?
                     
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                    • brian6pac

                      brian6pac Well-Known Member

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                      That is .032 no wonder it wont fit!
                       
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                      • Peyote

                        Peyote Well-Known Member

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                        The .032 part fits! It’s the part where the tolerance gets down to .0005 that’s the issue I think
                         
                      • sireland67

                        sireland67 Well-Known Member

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                        I just remembered my balancer did not have that step in it.
                        I bet you got a balancer that did not get final machined.
                         
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                        • Peyote

                          Peyote Well-Known Member

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                          Yay! Another $40 into the money pit! Lol
                           
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                          • brian6pac

                            brian6pac Well-Known Member

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                            I missed that LOL
                             
                          • SGBARRACUDA

                            SGBARRACUDA ROY FABO Gold Member

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                            Don't give up on it. Hone the inside till you get a snug fit. Then see if the pulley's line up.
                             
                          • Peyote

                            Peyote Well-Known Member

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                            What the best way to hone it?
                             
                          • sireland67

                            sireland67 Well-Known Member

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                            Send it back and get another one.
                             
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                            • Peyote

                              Peyote Well-Known Member

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                              I got the company to send me the tech drawing which doesn’t show the inner diameter, but does show the step down in ID in the middle. So I guess it’s supposed to be there.

                              I’m thinking maybe I try putting it in the oven to open it up and hope for the best.

                              Also I don’t have a installation tool, but Larry Shepherds book just says to use the crank bolt to install the damper
                               
                            • sireland67

                              sireland67 Well-Known Member

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                              My balancer did not have the step.
                              Does yours look like this, sorry it was the only picture I could find.

                              PcLfWI.jpg
                               
                            • Peyote

                              Peyote Well-Known Member

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                              No mine is all black
                               
                            • sireland67

                              sireland67 Well-Known Member

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                              Is yours SFI rated?