OT-Places to Rebuild an Old Bosch Injection Pump?
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    Default OT-Places to Rebuild an Old Bosch Injection Pump?

    One of the long on projects I've got is a Case 700 diesel. Injection pump isnt pumping fuel.

    I've never worked on an injection pump before, anyone know of any places in Houston or that would be mail order that can rebuild an old inline German Bosch pump?

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    Gerhardt's used to modify the Bosch pump to pump oil for gas pipeline compressors. They used to do a LOT of diesel work, too.

    They're out of the gas compression business now, but I think they still do diesel work.

    Gerhardt's Inc on Central Ave in New Orleans, LA - 504-733-2500 | USA Business Directory - CMac.ws

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    Hold on to your wallet, most inj shops are rip off joints, I know....Phil

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    Here is a link to the Association of Diesel specialists. There a trade group for shops that work on Diesel fuel injection equipment. Find a member shop close to you and take you pump to them and have them fix it. You need specialized equipment to properly set up and calibrate your pump to factory specification. This is one of those jobs where your far ahead to just write a check and be done.

    Find a Diesel Repair Shop - Association of Diesel Specialists

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    Quote Originally Posted by Phil in Montana View Post
    Hold on to your wallet, most inj shops are rip off joints, I know....Phil
    Years ago I sent an inline 4 pump off to a shop out west to have a $8 part inside replaced. They estimated $160 and I doubt it took even 1 hour.
    They charged me $475 plus return shipping. Claimed it took 'extra time' to 're-calibrate' it, replaced a few O rings. But they had my pump, so not much room to argue on my end. Ripoff indeed.



    I could not disagree with you more. Since the above incident years ago, I have worked on several Injection Pumps myself, very successfully, at very low cost. Parts and rebuild kits are available, with online guidance. Of course a certain skill level is required. Calibration may be required in some cases, but usually it's not and the cost can be avoided.

    Quote Originally Posted by SIP6A View Post
    Here is a link to the Association of Diesel specialists. There a trade group for shops that work on Diesel fuel injection equipment. Find a member shop close to you and take you pump to them and have them fix it. You need specialized equipment to properly set up and calibrate your pump to factory specification. This is one of those jobs where your far ahead to just write a check and be done.

    Find a Diesel Repair Shop - Association of Diesel Specialists
    Last edited by dkmc; 04-27-2020 at 01:46 PM.

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    The Viets next my yard sent a Fiat -Rabotti(Bosch PE license) pump off a Fiat marine diesel to a pump shop ,despite my warning ....The pump shop separated all the pumping units ,which are individually fitted ,and must be kept together...and a quote for $5000 ....The Viets came crying to me ,but I could do nothing with the pumping units separated in a plastic bag....Dont let the pump out of your sight.

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    Bosch and Bosch licence pumps were made all over the world ,with Bosch manufacture of mechanical fuel now in India.It is "legacy" technology ,meaning they dont want anything to do with it...Even in India its considered "dirty technology",and thats saying someting.....I have lots and lots of old diesel stuff...CAV,Simms ,Bryce ,Bosch ,Pal,Rabotti,American Bosch ,now Ambac,Diesel Kiki,etc....but I seem to recall ancient Cases had a odd type of American Bosch pump ,not similar to mainstream Bosch stuff.

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    what specificly is wrong with it

    if it has set awhile with the kill cable pulled rack could be stuck in the kill position

    pull the side off and see if you can get the rack to move

    verify that fuel is getting to the pump

    lots to go wrong working on a pump

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    what specificly is wrong with it

    if it has set awhile with the kill cable pulled rack could be stuck in the kill position

    pull the side off and see if you can get the rack to move

    verify that fuel is getting to the pump

    lots to go wrong working on a pump

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    If its an inline type pump ,its quite likely one or more of the pumping units is stuck ,jamming the rack in the stop position.....which is possibly fortunate ,as if the rack sticks in a fuel delivery ,it quite possible for the engine to run away ungoverned.....Happens a bit with GM 71s,one injector sticks ,jams the fuel control ,and motor blows,....this is the reason ,I gather that GM changed the setup to yielding levers ......anyhoo ,put up a pic or the code numbers off the pump ,and might be able to free it up,without spending one cent.

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    Pump is 100% getting fuel, and I'm only getting a small dribble of fuel out of one injector.

    It's an inline german bosch pump

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    What model pump ?....I fits a PE ,it will have a detachable side plate ,if not a bit more difficult......however ,the problem is one or more plungers are stuck in their barrels,and preventing the rack from moving...Is the camshaft turning?...Normally ,the cam turns one full turn and all of the stuck plungers stick full stroke.This normally happens on the engine .....Basic procedure for a cure is to remove the delivery valve on that plunger ,and replace the nut slightly tight ,as it retains the barrel...Next (be sure the cam is not on lift),find a brass rod much the same size as the hole (say 1/4") and carefully drive the stuck plunger down to the rest position ....the hard steel is quite fragile ,dont overdo it.....Turn the cam ,and see if the plunger is stuck again...if so repeat until it goes back by spring pressure.When that one is free,replace the delivery valve ,and repeat the procedure for another stuck plunger ,and so on.....Dont mix up delivery valve parts ,they are mated to millionths,like the plunger and barrel.....Ive had stuck pumps running again in ten minutes versus a removal and repair costing weeks and thousands.........NOTE.When all the plungers are free ,the rack will move back and forth quite freely,and the cam will turn freely ,with spring pressure returning the plungers....Fill the pump with oil in the cam part ,even if its engine lubricated......SECOND NOTE....run an engine on lube oil for a few minutes and plungers wont stick with ten years open air layup.

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    My understanding is that rebuilding a FI pump is pretty much the same as rebuilding a engine. Many of the same parts. Things are smaller and lighter so easier to move around abd fixture but need more accuracy. This means costs should be similar for each. Parts probably cost more for FI pump since fewer are made then the engines, since not all engines are diesel.
    Bil lD

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    Another thing to check...all Bosch pumps have a very fine gauze mesh strainer in the inlet fitting of the pump,usually a banjo....this is a common cause of fuel starvation and running problems .....Even the rotary pumps have this fine gauze.

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    Quote Originally Posted by alskdjfhg View Post
    Pump is 100% getting fuel, and I'm only getting a small dribble of fuel out of one injector.

    It's an inline german bosch pump

    If I understand you correctly, only one injector is not getting fuel. Disconnected that line to see if it's clogged up?? Or maybe the injector is clogged up?

    There is a injector place in Temple that has done good work for me. Don't remember the name at the moment. Something like "fuel injection service"'

    Haven't had any time to work on the Marathon other than washing it down and found a servo drive cheap.

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    Here are some pictures. I'm only getting a small dribble of from the point show by my finger

    Sent from my SM-G965U using Tapatalk

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    Quote Originally Posted by alphonso View Post
    If I understand you correctly, only one injector is not getting fuel. Disconnected that line to see if it's clogged up?? Or maybe the injector is clogged up?

    There is a injector place in Temple that has done good work for me. Don't remember the name at the moment. Something like "fuel injection service"'

    Haven't had any time to work on the Marathon other than washing it down and found a servo drive cheap.
    Good to hear you've been able to work on it some. Hopefully you can get it working

    Sent from my SM-G965U using Tapatalk

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    I'll tell you my JD 4239 story, it may offer some help. It's in an IR compressor, and when it would sit for 2 months, it wouldn't start. Not getting fuel.
    I finally made up a 'pressure pot' primer from an old 2lb fire extinguisher. Fill with diesel, air it up to 40-50 psi, and connect directly to fuel inlet on the pump. A blast from this rig would prime the pump, and then it would fire right up after reconnecting the fuel line from the tank. Kind of a hassle. So I installed an electric fuel pump between the tank and the pump, and that helped.
    Now for the old trucker's fix....I never really put much stock in the idea of 'doping' the fuel with a bit of ATF, but decided to try it after I installed the electric fuel pump. What could it hurt?? I put 1 quart in 15 gallons of fuel, and since I did that, I have not needed to use the electric pump to prime the system. It starts right up every time. The last test about 3 weeks ago, was after the unit sat all winter......maybe 5 months. It started right up after about 3 3revolutions like it just ran the day before. It was about 45F outside as well. I have decided there IS something to the theory of adding in ATF to the diesel fuel, at least is this case. YMMV

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    A JD 4/239 has a Roosamaster rotary pump if its US made,if Euro made it will have a CAV/DPA rotary pump.....not applicable to the OPs old Case .....The OP has problems ,because the pump is "turned into the block" as it were......meaning its needing to be removed from the motor,to be accessable. ...which it will have to be ,even if taken to a shop.


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