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Thread: Fuel Distributor Rebuild

  1. #11
    Senior Member DMCVegas's Avatar
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    Quote Originally Posted by Ron View Post
    The pressure to each injector is maintained by the Pressure Differential Valves which these are a part of....
    Ah yes, you're right! There is still a spring inside of the Primary Pressure Regulator that would either bleed off the difference in excess pressure from a clogged injector, OR would close in order to compensate for the loss in fuel pressure from an injector with a weak spring. In either case, this would still maintain the proper operating pressures in the remaining upper and lower chambers of the Fuel Distributor.

    So minor correction there (thank you, Ron!), but I'll stand by everything else.

    For everyone reading this out of curiosity to learn more about your fuel injection system, it seems complicated, I know. But don't worry. This is where K-Jetronic trades off physical labor for mental labor for problem solving.
    Robert

    People they come together, people they fall apart...

  2. #12
    Senior Member Bitsyncmaster's Avatar
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    Quote Originally Posted by Slammer View Post
    Some info here
    I have a stuck plunger, but another FD on the way. Anyhow I may have to look into rebuilding one.
    Thanks. That rebuild info shows some of the parts are the same but it defiantly has a different way to adjust flow amounts. It also looks like that FD is used on a non-adjustable mixture screw because the plunger is shimmed.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  3. #13
    Senior Member Bitsyncmaster's Avatar
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    I looked very closely at those filters from the injector side ports out in the sun light. It looks like one of them is dirty where as the other ones are shiny. But that filter is on the outlet side of the fuel flowing into the the injector lines. The owner I'm rebuilding this for also commented on cleaning the banjo bolts with a Q-tip that one was very dirty.

    So I guess I will need to pull that filter and see how dirty it is on the other side.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  4. #14
    Administrator Ron's Avatar
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    Quote Originally Posted by DMCVegas View Post
    So minor correction there (thank you, Ron!), but I'll stand by everything else.
    +1 !


    Dave, remove all of them and soak in acetone. etc -- you'll be surprised how much comes off, regardless of how they look...

    Use Indian Head or Wolf Head shellac, Silicon based stuff sux, imho. You can apply it more liberal than you might think -- just don't get it in the tiny hole and follow torque spec!

  5. #15
    Senior Member Bitsyncmaster's Avatar
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    It's funny they don't include those filters, from what I see they are really micro screen that hardly will let light show through. But it makes sense that a partial plugged filter would cause the trouble. Remember I said the flow rates were worse with the air plate fully pressed and got better with the lower rate flow testing.

    I pulled the housing where the plunger goes to look at that screen and it looks clean on the outside. So how did that one injector side filter get dirty?
    Attached Images
    Dave M vin 03572
    http://dm-eng.weebly.com/

  6. #16
    Senior Member Bitsyncmaster's Avatar
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    I pulled one of the filters and it looks clean but it's a very fine screen. I found a place that sells filters and I ordered some but not sure if they are the correct size. The filter I pulled is 0.210" OD which would be 5.33 mm. The universal BOSCH basket filter shows 6 mm. I will see when they get here if they will fit.

    http://injector-rehab.com/shop/Injector-Filters/
    Dave M vin 03572
    http://dm-eng.weebly.com/

  7. #17
    Administrator Ron's Avatar
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    Dave, fwiw, I was skimming through a Bosch manual and noticed it says the springs exert 1.0 bar pressure each...another source for the different flows you are seeing (not my first guess though... ;-)

  8. #18
    Senior Member Bitsyncmaster's Avatar
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    Quote Originally Posted by Ron View Post
    Dave, fwiw, I was skimming through a Bosch manual and noticed it says the springs exert 1.0 bar pressure each...another source for the different flows you are seeing (not my first guess though... ;-)
    Thanks. I don't think those filter baskets I found are going to fit this FD. Those are really for injectors. I would have thought there would be some standard size for all the filter baskets but I guess not.

    At least we are learning things about the FD.

    Do our injectors have a removable filter basket on the end? I never thought to look.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  9. #19
    Senior Member Bitsyncmaster's Avatar
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    Filter Baskets

    Here is a photo of the filter baskets just to show you how small they are. Only dirt I see it inside the basket, so it had to get in there when the banjo bolts were removed.

    The screw I used to remove them has an OD of 0.138" (thread OD). Has 20 TPI. I grabbed the top with a pair of large wire cutters and the high center of the FD used as a fulcrum. Then tapped on those wire cutter handles with a hammer. I put the screw in 3 turns which worked fine on all six baskets.
    Attached Images
    Dave M vin 03572
    http://dm-eng.weebly.com/

  10. #20
    Senior Member Bitsyncmaster's Avatar
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    Here is a photo of the worst accumulation of "dirt" I found. This dirt must have formed from the gas since the filters in the FD would not allow that to enter.
    Attached Images
    Dave M vin 03572
    http://dm-eng.weebly.com/

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