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Thread: Y-Pipe Corrosion - Pitting

  1. #1
    Junior Member ZLoftsgard's Avatar
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    Y-Pipe Corrosion - Pitting

    Hi Everyone. I am working through VoD cleaning and while accessing/cleaning the Y-Pipe, I found some pitting on the two sealing surfaces that mate up with the block. I know this seals with an oring however I want to be positive I do not have leaks.
    My plan is to have the two sealing flanges machined down equally just enough to clean the sealing area. I wanted to post and see if anyone else has performed this maneuver or has another idea on how to address this other than gasket maker or some of other sealant?

    Y-Pipe 1.jpg

    Y-Pipe 2.jpg

  2. #2
    Senior Member
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    Location:  Pittsburgh, PA

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    For what it's worth, the standard vendor procedure here is The Right Stuff gasket maker. My situation was a mess since I had corrosion down two of the bolt holes.

    If you get a new y pipe, which I had to, it'll be nicely machined.

    Sent from my Pixel 3 using Tapatalk

  3. #3
    Junior Member ZLoftsgard's Avatar
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    Thanks for the advice!
    Fortunately, I have a pipe that is salvageable. I am thinking that I could just remove a few 0.001" and be ok. Just enough to clean up the pitting.

    I am planning to drop it off in the next day or so to a local machine shop.

  4. #4
    Senior Member Bitsyncmaster's Avatar
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    Quote Originally Posted by ZLoftsgard View Post
    Thanks for the advice!
    Fortunately, I have a pipe that is salvageable. I am thinking that I could just remove a few 0.001" and be ok. Just enough to clean up the pitting.

    I am planning to drop it off in the next day or so to a local machine shop.
    That looks more like 0.010" or more but as long as both surfaces are parallel it should not be a problem.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  5. #5
    DMC Midwest - 815.459.6439 DMCMW Dave's Avatar
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    Quote Originally Posted by ZLoftsgard View Post
    My plan is to have the two sealing flanges machined down equally just enough to clean the sealing area.
    We get them machined. You can take off quite a bit since the other end is a rubber hose. If you look closely you will generally find that the pitting is outside the area that is sealed by the O-ring so in reality it doesn't take much to clean it up.
    Dave S
    DMC Midwest - retired but helping
    dswingle@DeLorean.com

  6. #6
    Junior Member ZLoftsgard's Avatar
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    Thanks for the feedback!
    I will move forward with that plan!

  7. #7
    Delorean Guru
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    You can pressurize the cooling system before you put the intake manifold back on to make sure you have no leaks before you go through all of the work on the manifold and the fuel system.
    David Teitelbaum

  8. #8
    Junior Member ZLoftsgard's Avatar
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    Quote Originally Posted by David T View Post
    You can pressurize the cooling system before you put the intake manifold back on to make sure you have no leaks before you go through all of the work on the manifold and the fuel system.
    That's a great point. I will be sure to pressurize and see if my work under the intake manifold is good before moving on. Thanks for the suggestion!

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