Learning About Diesel Engines





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  1. #1
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    Default Learning About Diesel Engines

    Hi All

    i have been a fanatic about all things Engines, cars, Bikes, and up to lately a diesel pickup. I think it is worth mentioning that I am very familiar with the workings of most things petrol and i know my way around them quite well. Not so Much on Diesel Engines.
    i bought a 76 Ford F100 Custom , which has been fitted wit a RD28 and Manual Gearbox, far from original.
    i have done some work on the motor such as checked water and oil levels, electrical connections and such. I have cleaned up most of what seems to oil leaks and the dirt and crud around the motor.

    I turned the motor over many times by hand and then i connected a battery and attempted to start the motor, After adding some quick start and a few swings later the motor started.
    it was running pretty decent for the most part, and sounded pretty decent.

    the motor was running at high RPM's i couldn't say how high as the Pick has no Rev counter, upon using the accelerator (on the diesel pump) it didn't make any difference, if i closed the accelerator it revved a bit higher and if i increased the accelerator it died.

    Whilst the motor was running i actuated the Diesel cut off solenoid to stop the engine from running, but it made no difference.

    Once the motor was shut off , i actuated the Diesel cut off solenoid manually with 12v from the battery and it sounds to be opening and closing.
    however it does not stop the motor from running.

    i am not clued up with diesel motors and or diesel pumps.
    is there something i can check, do, or service ? i have found a workshop manual for both the engine and the Diesel pump. but i have no idea where to start.

    Like i mentioned it is a RD28 engine with a NP-VE6/10F2500NP100 Diesel pump.
    Any Advice will be greatly appreciated.

  2. #2
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    Default Re: Learning About Diesel Engines

    Send a PM to Reenen, he has worked on those engines recently, he can help trouble-shoot. Or he'll pop in here soon, he's not only on lock-down, he's in a wheelchair so he is bored.
    2012 Jeep Sahara Unlimited 3.6 V6
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  3. #3
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    Default Re: Learning About Diesel Engines

    But from the sounds, the engine is running on blow-by oil. Loosen the oil filler cap when it runs and see if there is smoke and/or gases being pushed out the filler hole.

    Luckily those engines are cheap as chips from the importers.
    2012 Jeep Sahara Unlimited 3.6 V6
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    Default Re: Learning About Diesel Engines

    Send a PM to Reenen, he has worked on those engines recently, he can help trouble-shoot. Or he'll pop in here soon, he's not only on lock-down, he's in a wheelchair so he is bored.
    i will do so thank you

    But from the sounds, the engine is running on blow-by oil. Loosen the oil filler cap when it runs and see if there is smoke and/or gases being pushed out the filler hole.

    Luckily those engines are cheap as chips from the importers.
    i will look into this thanks for the tip

  5. #5
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    Default Re: Learning About Diesel Engines

    Gaan sommer hier antwoord.
    Eerstens, maak breather los van intake manifold, en sit dit binne in n 2 liter coke bottel.

    Dan skakel jy moontlikheid uit dat dit op blow by loop, en jy kan kan sien presies hoeveel blow by jy het.

    Verder, maak seker jou olie vlak is nie te hoog.

    As jy toegang het tot n diesel kompressie toetser, kyk wat jou kompressie op elke silinder is, kyk of daar nie een gekraak is.

    Breater pyp kan jy nie net terug na sump sit, hy kom van sump. As jy dit doen, gaan hy maar net jou dipstick uitblaas. Return to sump catch can is n setup wat net bietjie beter werk as daardie plastiek een wat reeds op tappit cover is. Daai engines breath maar baie, so hy kom uit met n return to sump setup wat nie baie effektief is.

    Jy maak n kan wat olie opvang op uit breath vapour, en dan net die ont oliede gas na buite uit laat en al die opgevangde olie met hravitasie terug vat sump toe. So jy scrub maar net die breathing gas voor dit na atmosfeer of terug na intake toe gaan.
    Vrywaring: Niks wat ek hier kwyt raak moet hoegenaamd as feite beskou word nie.

  6. #6
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    Default Re: Learning About Diesel Engines

    Awesome dankie Reenen.

    Ek gaan dit beslis doen. Ek laat weet wat my resultate is.

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    Default Re: Learning About Diesel Engines

    So I had a look at the above mentioned.

    I don't have a breather connected to the intake manifold from the engine, The airfilter and connecting pipe work has currently been disconnected.

    Could the oil get into to the cylinder chamber via bad rings and the burn like that.?

    Also my Compression tester does not fit the engine as it's for petrol engines. Is there anyone in the centurion area that has one I could borrow to test the compression.?

    I have attached some pictures to help explain the breather contraption.
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  8. #8
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    Default Re: Learning About Diesel Engines

    Quote Originally Posted by Donovanporter View Post
    So I had a look at the above mentioned.

    I don't have a breather connected to the intake manifold from the engine, The airfilter and connecting pipe work has currently been disconnected.

    Could the oil get into to the cylinder chamber via bad rings and the burn like that.?

    Also my Compression tester does not fit the engine as it's for petrol engines. Is there anyone in the centurion area that has one I could borrow to test the compression.?

    I have attached some pictures to help explain the breather contraption.
    Nope, jy het def n pyp van breather na intake.
    Jy het hom self afgeneem
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    Daai mini catch can loop in n bar in wat oop is na elke silinder intake.
    Vrywaring: Niks wat ek hier kwyt raak moet hoegenaamd as feite beskou word nie.

  9. #9
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    Default Re: Learning About Diesel Engines

    Maak die knip in rooi omsirklel
    Los, sit n las in, verleng na n plastiek 2 liter coke bottel.
    En maak die gat op bar na intake toe.
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    Vrywaring: Niks wat ek hier kwyt raak moet hoegenaamd as feite beskou word nie.

  10. #10
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    Default Re: Learning About Diesel Engines

    Breather bar op intake manifold
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    Hierdie is egr. Blok hom met n plaaitjie waar hy op intake of exhaust manifold vas kom, of sny pyp af en knak beide punte om
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    Vrywaring: Niks wat ek hier kwyt raak moet hoegenaamd as feite beskou word nie.

  11. #11
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    Default Re: Learning About Diesel Engines

    Ah yes I see now Allright.

    Let me do that and check back with you.

    Thank you.

  12. #12
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    Default Re: Learning About Diesel Engines

    Can I Remo e the EGR completely and block the ports off with a steel plate gasket?

  13. #13
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    Default Re: Learning About Diesel Engines

    Ja. Maar maklikste is om pyp te sny en knak. Hy maak vas op exhaust met n nut.
    Vrywaring: Niks wat ek hier kwyt raak moet hoegenaamd as feite beskou word nie.

  14. #14
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    Default Re: Learning About Diesel Engines

    Great.
    Thank you Reenen

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    Default Re: Learning About Diesel Engines

    Okay so I have managed to get some work done on the pickup.

    I done the EGR delete and I have done a oil catchcan retrofit.

    The motor does not start at all with our engine start spray. And when it does starts it sometimes idle's abit, and then dies. Or it idle's and revs very high. Some times it starts and revs in the limiter ( that's what it sounds like).

    When the motor idle's it is very erratic and not at the right rpm. When I Rev the the motor on the diesel injector it does nothing. If I reverse the throttle ie the opposite of revving, the engine dies. And that is the only way I can stop the engine.

    I did not see any oil in the catch can after the 30 minutes or so that I was busy. I did not notice any oil coming from the filler cap on the valve cover either.

    Could the diesel pump be blocked? The pick up did stand very a number of years.

    Should I strip the diesel pump and service it?
    Or should I check something else before I go to that extreme.?

    Tha k you in advance guys..

  16. #16
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    Default Re: Learning About Diesel Engines

    Crack loose all the injector nuts, see if it pushes out diesel
    Vrywaring: Niks wat ek hier kwyt raak moet hoegenaamd as feite beskou word nie.

  17. #17
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    Default Re: Learning About Diesel Engines

    Allright I will check that first.

    Thanks reenen

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    Default Re: Learning About Diesel Engines

    Good morning guys.

    So I have come to a conclusion.

    The head gasket is shot.
    I done the whole bleeding scenario as you suggested Reneen which worked well. I managed to get quite alot of air flowed by diesel so that worked.

    I heared water dripping, and I checked that there was a flow of water so where out of the motor towards the back just below where the oil breather is situated. I could not see where exactly.

    I opened the radiator cap and it was super pressurised. I left it open and swung the motor again, and was great Ed by puffs of water and air out of the cap.

    I can safely assume the head gasket is damaged.
    So I am guessing the next step would be to strip the head and have a in depth look and see where the issue lies and then take it from there.

  19. #19
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    Default Re: Learning About Diesel Engines

    Hi all.

    So after a bit of a break from the pickup, I have managed to get some time in on it and got the spanners out.

    So my suspicious water and oil leaking from the motor is now confirmed.

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    I ran my finger around the barrel and I could not feel any kind of Ridge or scratches, which was a relief 😌.

    I'll start the cleaning process and the overhaul the head and the reassemble and do a full service. Then we'll all should be good to go.

  20. #20
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    Default Re: Learning About Diesel Engines

    Before you spend too much, get prices on imported engines first
    2012 Jeep Sahara Unlimited 3.6 V6
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