1. tjpatte

    tjpatte Well-Known Member

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    Below are the pictures of my crank and TC after about 4 months and 1500 miles. The snout of the TC was tight in the crank when I put it together (didn't know better always a stick guy before). Had the proper clearance between the TC pads and flex plate before pulling it forward. Noticed the crank walking one day and found I had about 0.032 crank movement and a wiped thrust bearing.

    Good info on TC dimensions and clearances, surprisingly little out there about this.
    Torque Converter info for various transmissions





    Crank.jpg Torque Converter.jpg
     
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    • tjpatte

      tjpatte Well-Known Member

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      Mine was perfectly flat.
       
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      • oldkimmer

        oldkimmer FABO Gold Member FABO Gold Member

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        Ouch! Kim
         
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        • Jadaharabi

          Jadaharabi FABO Gold Member FABO Gold Member

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          There you go.
           
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          • Dusterdenovo

            Dusterdenovo Contentedly Old School

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            You guys might find this interesting:

            While I have been talking with Hughes today about possibly shipping the TC back to them, I also put in a call to B&M (Holley Group) to ask them a few questions about the flatness of the Flex Plate etc. While I do not have plans of doing this, here is what I was told:

            "There is not a set tolerance on flexplates. It can vary from 1/8” up to ¼” when they are setting flat and not bolted to anything. Bolting to a converter and crankshaft is what straightens them up"

            NOT part of my plan, but interesting enough to share.
             
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            • tjpatte

              tjpatte Well-Known Member

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              Yep, I found the same thing in my endless search for information on what went wrong. I was worried about mine since I had to pry it apart, but thankfully it stayed straight.
               
            • 12many

              12many Well-Known Member

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              I’d also be worried about how the centerline of the converter as mounted to the crank lines up with the trans centerline, the pump bushing won’t like anything being off as I believe that is mentioned in the B&M paperwork. Think rapid bushing wear and leakage. Line boring of the block changes alignment, and while an oem flexplate actually flexes and is more forgiving the B&M doesn’t and isn’t. Pretty damn rigid as I’m sure you’ve noticed. Have you checked crank pilot depth, and the converters pilot? Difference in positioning from block/trans mounting surface of the oem plate vs. the B&M? Likely some hardened sae washers (Hillman brand at better hardware stores) is all you’ll need but lots to check over.
               
            • Dusterdenovo

              Dusterdenovo Contentedly Old School

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              Yup. Sent a number of pictures over to Hughes today. Their guy has been pretty attentive to the problem so I'll see what he says after his guru looks at it.
               
            • Jadaharabi

              Jadaharabi FABO Gold Member FABO Gold Member

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              Last edited: Feb 6, 2020
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              • tjpatte

                tjpatte Well-Known Member

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                When you look at the B&M you would think it doesn't flex (I know I did), but it actually does. How much, I can't say, however after my second go around I found marks that showed movement.

                Agree with the alignment and currently making sure that the snout is aligned with the center of the crank so there is no pressure points.

                I guess the point I'm trying to make is that the TQ needs to be able to slide inside the crank to allow for fluctuations in tranny pressure surges and that the flex plate flexes.
                 
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                • oldkimmer

                  oldkimmer FABO Gold Member FABO Gold Member

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                  And the snout needs to be greased up so it can move easily. I know most ppl skip that step. Kim
                   
                  Last edited: Feb 6, 2020
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                  • tjpatte

                    tjpatte Well-Known Member

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                    Yep, I use anti seize.
                     
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