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Thread: Rebuilding fuel distributor

  1. #1
    Senior Member SupercoolBill's Avatar
    Join Date:  Oct 2021

    Posts:    202

    Rebuilding fuel distributor

    I am getting ready to try to rebuild my Bosch fuel distributor.
    Looking for any advice out there. I have watched a couple you tube videos and it seems like something I can handle.
    One question I have is what should I use to seal the unit?
    Here's what I already have for options-20211118_095358.jpg

    Sent from my SM-G970U using Tapatalk

  2. #2
    EFI'd dn010's Avatar
    Join Date:  Jul 2011

    Location:  Florida: Pinellas County

    Posts:    2,077

    My VIN:    5003 Never placed Concourse

    Club(s):   (DCF)

    I used gasket shellac compound, as suggested in the CIS Rebuild PDF linked to post #2 of:

    http://dmctalk.org/showthread.php?352-K-Jetronic-System
    -----Dan B.

  3. #3
    Guy with a DeLorean Mark D's Avatar
    Join Date:  May 2011

    Location:  Stevens Point,WI

    Posts:    2,341

    My VIN:    6125

    Not sure if this is one of the rebuild videos you've seen yet, but might be worth a watch. Similar K-jet unit from a BMW E21

    VIN 6125: Now with 300% more banana in the tailpipe for headache-free cruising comfort.

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

    Location:  Leonardtown, MD

    Posts:    8,383

    My VIN:    03572

    I one time considered doing this for others. I did rebuild one and used the shellac sealer. I did not like that sealer or any sealer because the two half surfaces are so perfectly flat and when they are torqued all the sealer has to go somewhere (fill the tiny holes in the metal plate). The originals have no sealer so if I ever do another one I would try it dry. I do have a granite flat block I could resurface each half on it with fine sandpaper.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  5. #5
    Senior Member 82DMC12's Avatar
    Join Date:  May 2011

    Location:  Olathe, KS

    Posts:    963

    My VIN:    11596

    Never heard of shellac sealer. I would probably use Hylomar AF - it's fuel resistant and is made to fill those tiny microscopic imperfections between the metal gasket and the halves.
    VIN 11596 Jan 1982 build - owned since Nov. 2000!

    Photography and Backpacking is life.

    Was Fargo, ND
    Now Olathe, KS

  6. #6
    Senior Member SupercoolBill's Avatar
    Join Date:  Oct 2021

    Posts:    202

    Too bad there wasn't something you could just spray a mist on there then put it together. Almost like spray contact cement (but not contact cement)
    What if I put gas resistant sealer on the halves then wipe it back off just leaving a residue?

    Sent from my SM-G970U using Tapatalk

  7. #7
    Senior Member SupercoolBill's Avatar
    Join Date:  Oct 2021

    Posts:    202

    I guess I could try putting it together without sealer. Nothing to lose. If it leaks pull it back apart and use sealer.

    What about just a thin coat of grease?

    Sent from my SM-G970U using Tapatalk

  8. #8
    Senior Member Bitsyncmaster's Avatar
    Join Date:  May 2011

    Location:  Leonardtown, MD

    Posts:    8,383

    My VIN:    03572

    Quote Originally Posted by SupercoolBill View Post
    Too bad there wasn't something you could just spray a mist on there then put it together. Almost like spray contact cement (but not contact cement)
    What if I put gas resistant sealer on the halves then wipe it back off just leaving a residue?

    Sent from my SM-G970U using Tapatalk
    There was a head gasket sealer that you sprayed on back in the day. Not sure if they sell that anymore.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  9. #9
    Senior Member
    Join Date:  Jan 2019

    Posts:    185

    Quote Originally Posted by SupercoolBill View Post
    I guess I could try putting it together without sealer. Nothing to lose. If it leaks pull it back apart and use sealer.

    What about just a thin coat of grease?

    Sent from my SM-G970U using Tapatalk
    If you assemble it without sealant, make sure that all surfaces are spotless and there is no dust particles on it prior to assembly.

    Grease? For? Grease wouldn't prevent it from leaking as it would just wash out.

  10. #10
    Senior Member
    Join Date:  Dec 2018

    Posts:    839

    I use to use some red stuff made by OMC. (Boats) for metal to metal. It works great. I believe loctite also makes good product for that.

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