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Thread: Bung on top of crossover pipe Y

  1. #1
    Junior Member
    Join Date:  May 2018

    Location:  Irvine CA

    Posts:    25

    Bung on top of crossover pipe Y

    Iím replacing my left exhaust manifold gasket. Anybody know what this ďbung with a bolt in itĒ is for?
    See photo.
    Also what is the bedt tool to loosen the upper left (driver side) of the 4 nuts attaching the crossover pipe to the exhaust manifold? It squarely blocked by the oxygen sensor! Iím thinking of using a 17mm crow foot because a 17mm socket wonít fit over the nut without removing the oxygen sensor - which I canít remove.

    What is the best tool to remove the oxygen sensor (if I have to remove it)? It points toward the side of the vehicle and a longer sensor socket wonít fit over the sensor. Is it 13/16Ē or 20mm or 21mm?
    Last edited by Ed81DMC; 06-04-2018 at 12:05 AM. Reason: Add photo of bung

  2. #2
    Junior Member
    Join Date:  May 2018

    Location:  Irvine CA

    Posts:    25

    Photo of the bung on top of the crossover Y pipe

    Quote Originally Posted by Ed81DMC View Post
    Iím replacing my left exhaust manifold gasket. Anybody know what this ďbung with a bolt in itĒ is for?
    See photo.
    Also what is the bedt tool to loosen the upper left (driver side) of the 4 nuts attaching the crossover pipe to the exhaust manifold? It squarely blocked by the oxygen sensor! Iím thinking of using a 17mm crow foot because a 17mm socket wonít fit over the nut without removing the oxygen sensor - which I canít remove.

    What is the best tool to remove the oxygen sensor (if I have to remove it)? It points toward the side of the vehicle and a longer sensor socket wonít fit over the sensor. Is it 13/16Ē or 20mm or 21mm?
    Photo of the bung on top of the crossover Y pipe Attached
    Attached Images

  3. #3
    Member
    Join Date:  May 2011

    Posts:    56

    its removable so that you can insert a pipe and using a gas analyzer tool you can read the AFR or CO (mixture).

    there is one on each side so that you can read each bank.

  4. #4
    Senior Member mluder's Avatar
    Join Date:  May 2011

    Location:  Happy Valley, OR

    Posts:    1,641

    My VIN:    4456 - Owner since March 2011

    Club(s):   (PNDC)

    I found the top bolt on the driver's side was easiest to get at with a combination wrench from above. Even then it wasn't easy.

    Cheers
    Steven
    Cheers
    Steven Maguire
    #4456


    IT'S A TRAP!!!!!

  5. #5
    DMC Midwest - 815.459.6439 DMCMW Dave's Avatar
    Join Date:  May 2011

    Location:  Crystal Lake IL

    Posts:    5,079

    My VIN:    05429

    Oxygen Sensor is 13/16". Best tool to remove it is an oxygen sensor socket and/or an open end wrench, right after heating the bung with an acetylene torch.
    Dave S
    DMC Midwest - retired but helping
    dswingle@DeLorean.com

  6. #6
    EFI'd dn010's Avatar
    Join Date:  Jul 2011

    Location:  Florida: Pinellas County

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    My VIN:    5003

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    If you don't have an acetylene torch or even a turbo torch, run the engine to get things hot and then try to remove the sensor. Obvious warnings - wear gloves, don't touch the hot pipes, etc.
    -----Dan B.

  7. #7
    Delorean Guru
    Join Date:  May 2011

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    Club(s):   (DMA)

    Hot is good but you really have to get it red hot to have the full effect. The only way to get it red hot is with an Oxy-Acet torch.
    David Teitelbaum

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