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Motion Dynamics 3" down pipe has serious issues

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  • #16
    I was having similar issues of the flapper seizing with my ATR down pipe.

    I was wondering if the steel flapper shaft in the steel housing (steel on steel) might be the problem and if a bronze bushing would help.
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    • #17
      Jim said that it doesn't happen often to the factory one because it's steel through cast iron. The MD pipe is steel on steel causing a material issue. he thinks that the shaft needs to be replaced with a stainless shaft. I'll take him up on it when it locks up again.

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      • #18
        The only reason I thought of bronze was its self lubricating properties that make it a good choice valve guides.
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        • #19
          I think bronze would work just fine.

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          • #20
            One week later...

            ...and it's seized up again. I quit. I'm going external.

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