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Thread: bukh trouble

  1. #11
    Join Date
    Mar 2012
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    North Wales
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    Default Re: bukh trouble

    I had a very similar problem on my DV20. Would run fine for hours, but as soon as I decreased the revs, the engine would die and wouldnt restart. The puzzling part was that after an hour or so it would start again after it had cooled down enough. It turned out to be a faulty injector. I had the nozzle replaced and it worked fine. It is really easy to take the injector to a diesel specialist to have checked, which only costs around £5.

    If your fuel filters are clean, I would check the injector next.

  2. #12
    Join Date
    Oct 2007
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    Poole
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    Default Re: bukh trouble

    that sounds like exactly what it is.!!
    Thankyou

  3. #13
    Join Date
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    Poole
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    Default Re: bukh trouble

    new engine filter fitted. There was some cystallised brown stuff in there. , but not in the water trap/primary which is odd.

    swapped the injector with one of another engine which I had tested on the way to the boat so I know it's good.
    btw Thankyou to Poole Diesel who tested it instantly at no charge.
    he didn't think the injector could be the cause, but fitting a known good one is not an issue.

    His diagnosis was a possibly partially blocked return pipe building a backpressure that is overcome by the lift pump at power, but not at hot tick-over, so the engine stops till the pressure eases.

    I blew through it till I heard bubbles in the tank, but I think I will increase the diameter this winter. as it was harder than I expected.
    At least if thats the cause I can relieve the pressure after failure and it should restart.

    I can only know if its fixed when I make a longish run again.

  4. #14
    Join Date
    Mar 2012
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    North Wales
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    Default Re: bukh trouble

    That's what everyone said to me along with many professionals. I spent a long time diagnosing the problem. That's why it was so baffling. No one thought it could be the injector until that was the last thing I checked. Have the the old one checked for the spray pattern I bet it just squirts in one stream rather than atomising the fuel.

  5. #15
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    Oct 2007
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    Poole
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    Default Re: bukh trouble

    It would indeed be ironic if it is the injector, as I spent University time studying petrol injectors, particularly charging the fuel stream to 25KV to improve atomisation...

    H&S were not convinced by our anti-explosion defences.

  6. #16
    Join Date
    Mar 2012
    Location
    North Wales
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    Default Re: bukh trouble

    Did the replacement injector solve the problem?

  7. #17
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    Poole
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    Default Re: bukh trouble

    Quote Originally Posted by stevd View Post
    Did the replacement injector solve the problem?
    I don't know yet, I haven't undertaken a significant stretch to give me that confidence.
    It has since occurred to me that since I have seen crud in both the filters in the last season, that there may be some still in the lift pump, which is the lowest point, and likely to collect there, so I will clean that out before I try a longer run..
    I already blasted the rest of the pipes and the tank during the winter, but I didn't think to dismantle/clean the lift pump.

  8. #18
    Join Date
    Mar 2012
    Location
    North Wales
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    351

    Default Re: bukh trouble

    If you get the old injector tested and it is found to be faulty, you will know that you have found the problem and should give you the confidence to use it.

  9. #19
    Join Date
    Oct 2007
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    Poole
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    Default Re: bukh trouble

    Quote Originally Posted by stevd View Post
    Did the replacement injector solve the problem?
    In short, no it did not.


    I motored about 2 hrs from hengistbury head to Lymington , and the engine was OK at Lymington..
    I motorsailed from Lymington to upperhamble, about 3 hours, and the engine quit as I approached the pontoon, biut it restarted and I drove into the pontoon OK..
    There was more water this time, so I replaced the prefilter.

    I sailed back to lymington, and used the engine just the last hour
    Engine was OK on arrival, but still had water in the prefilter.

    then sailed back to Poole, used the engine from Heng,head for about 3hrs, and it quit again on approaching the mooring. 30 seconds or so later it restarted.

    It does seem to drop revs substantilaly below tickover when throttled down, sometimes it recovers, sometimes not.

    Despite cleaning the tank out in winter I have a serious water problem, but I don't know why.

    Nor do I understand the dying to sub-tickover.
    tickover is set at 1000rpm


    -(

  10. #20
    Join Date
    Nov 2007
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    Boat Orwell - Me Norwich
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    Default Re: bukh trouble

    Quote Originally Posted by chewi View Post
    Despite cleaning the tank out in winter I have a serious water problem, but I don't know why.
    Replace the filler cap (or a least its O-ring seal)?

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