Bosch A Pump more fuel
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Thread: Bosch A Pump more fuel

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    Default Bosch A Pump more fuel

    I have an Iveco Truck with an Deutz Air Cooled 6.1L inline engine. It has 160hp and i want-need more power.
    My first question is how to turn up the Bosch A pump ? I havent found anything that realy helps me with the injection pump. I found instruction how to turn up the VE and P pump but nothing really about the A.
    I would be very lucky if someone got instruction with pictures how to turn up the A pump
    Also what do I need to do for little bit more rpm ?
    Attached Images Attached Images

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    Quote Originally Posted by mog1300 View Post
    I have an Iveco Truck with an Deutz Air Cooled 6.1L inline engine. It has 160hp and i want-need more power.
    My first question is how to turn up the Bosch A pump ? I havent found anything that realy helps me with the injection pump. I found instruction how to turn up the VE and P pump but nothing really about the A.
    I would be very lucky if someone got instruction with pictures how to turn up the A pump
    Also what do I need to do for little bit more rpm ?
    You should be able to get some ideas in the Isuzu section, the pumps the 4BD series run are licensed copies of the A pump.

    The external adjustments that I know of on mine are the full load (aka "more power screw") idle and high speed (defuel) limit screws.

    There is a link in my sig for one of them.

    The other two, on the Isuzu variants I've seen are next to each other by where the accelerator control connects to the governor, but your governor looks different in your pic (from what I can see), do you have any other pictures of your pump and governor?
    Erik
    Isuzu Nut
    Deviant that's keeping the NPR (with the engine).
    http://www.4btswaps.com/forum/showthread.php?t=9646
    '94 4BD2-TC, HY35W (early) with 3" exhaust & exhaust brake, 'more power screw' maxed, defuel turned up, pump turned up internally by accident.

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    Nexxuissian,
    So your running a A pump motor?

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    Here are more pictures, sorry for the bad quality. On this pump I have no clue how to adjust it for more fuel etc.
    Now I got 160HP. My goal is around 200hp. I also ad an intercooler.
    Attached Images Attached Images

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    It's the governor on the back of the pump that's the problem. Are there any identifying tags?

    Usually once you can ID the governor, you can find cutaway pictures or diagrams which show which adjustment is hidden where. Otherwise you'd have to start by removing all the wire seals and see what is under them.
    Isuzu 4BD1T Junkie.

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    Quote Originally Posted by mog1300 View Post
    Here are more pictures, sorry for the bad quality. On this pump I have no clue how to adjust it for more fuel etc.
    Now I got 160HP. My goal is around 200hp. I also ad an intercooler.
    Quote Originally Posted by Dougal View Post
    It's the governor on the back of the pump that's the problem. Are there any identifying tags?

    Usually once you can ID the governor, you can find cutaway pictures or diagrams which show which adjustment is hidden where. Otherwise you'd have to start by removing all the wire seals and see what is under them.
    Yeah, that's the rub, it looks like the accelerator linkage is on the side of the governor with an external return spring.

    Are there any adjustment screws there?

    Do you have a view of the data plate on the pump?

    Should be able to suss out what you need to know from that.

    Any idea how much power you are looking for?
    Erik
    Isuzu Nut
    Deviant that's keeping the NPR (with the engine).
    http://www.4btswaps.com/forum/showthread.php?t=9646
    '94 4BD2-TC, HY35W (early) with 3" exhaust & exhaust brake, 'more power screw' maxed, defuel turned up, pump turned up internally by accident.

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    Quote Originally Posted by firemanram View Post
    Nexxuissian,
    So your running a A pump motor?
    Yes, it's the nearly stock pump on the Isuzu engine in my NPR.
    Erik
    Isuzu Nut
    Deviant that's keeping the NPR (with the engine).
    http://www.4btswaps.com/forum/showthread.php?t=9646
    '94 4BD2-TC, HY35W (early) with 3" exhaust & exhaust brake, 'more power screw' maxed, defuel turned up, pump turned up internally by accident.

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    Thats what I found on the back of the pump.

    Bosch
    RQV 300.1250 AB 1188

    The back side of the pump is hard to reach so I am ot 100% sure if all number are 100% correct

  10. #9
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    Quote Originally Posted by mog1300 View Post
    Thats what I found on the back of the pump.

    Bosch
    RQV 300.1250 AB 1188

    The back side of the pump is hard to reach so I am ot 100% sure if all number are 100% correct
    Bingo. RQV cutaway is here: http://www.automotive-tradition.de/e...rnor%20RQV.pdf
    Looks like it's the top shaft and you have a boost compensator to contend with as well.
    Isuzu 4BD1T Junkie.

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    Thanks alot !!!
    So is this one the same as the one with the boost compensator ?
    Am I correct that I have to turn out the top bolt with the 2 jam nuts !? If yes, how much (to get startet).
    Is there something to adjust on the boost compensator?

  12. #11
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    Quote Originally Posted by mog1300 View Post
    Thanks alot !!!
    So is this one the same as the one with the boost compensator ?
    Am I correct that I have to turn out the top bolt with the 2 jam nuts !? If yes, how much (to get startet).
    Is there something to adjust on the boost compensator?
    I don't have any experience with your exact governor. But essentially this is how it works.
    The governor controls the rack movement (fuel delivery) up to two stops. A full load stop, which is likely the top bolt with the two jam nuts, and if a boost compensator is fitted, it has another movable stop which makes contact before the full-load stop when there is no boost.

    Good luck and let us know how you get on.
    Isuzu 4BD1T Junkie.

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    Before you turn the screw, you might check to make sure the boost compensator isn't ruptured or otherwise leaking.

    Apply a small amount of vacuum to the inlet line of the boost compensator, if it holds it's ok, if not you will probably want to fix that before cranking the fuel up.

    Good luck, if you don't have a pyrometer you will want one before you start turning the screws on the pump.
    Erik
    Isuzu Nut
    Deviant that's keeping the NPR (with the engine).
    http://www.4btswaps.com/forum/showthread.php?t=9646
    '94 4BD2-TC, HY35W (early) with 3" exhaust & exhaust brake, 'more power screw' maxed, defuel turned up, pump turned up internally by accident.

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    I will chek the boost compensator ! Thanks for all the help !!
    This is the Truck where the engine is in . The whole Truck got 18750mls. It is an 85 Iveco 90-16AW 4x4. I know the tires are ugly and way to small, I will change them to bigger ones.
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    Quote Originally Posted by mog1300 View Post
    I will chek the boost compensator ! Thanks for all the help !!
    This is the Truck where the engine is in . The whole Truck got 18750mls. It is an 85 Iveco 90-16AW 4x4. I know the tires are ugly and way to small, I will change them to bigger ones.
    Sweet truck! That 75 series Land Cruiser behind it is cool as well
    Johnny C - KK4HAN - TLCA# 17825
    Olde North State Cruisers
    1987 4BTJMashup - MoonShine - 4BT/NV4500/D300/D60/14B and a bunch of other modifications. - DD
    Land Cruiser adventures, documented through YouTube

    Quote Originally Posted by Dougal
    I'm an engineer, I find solutions that work and really hate marketing dribble.

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