Bukh DV20 Starting Issue

[James_Calvert]

I'd a similar problem a while back. The injector pump was the problem; it was stuck in a position that shut off the fuel supply. The yard engineer freed it off and it was ok for a season, but I ended up having it reconditioned by a local specialist.

And I think the problem was originally caused by water in the oil. In this case, it turned out to be the seals having failed in a cylinder liner. But I only found this out after a major strip down.

Do get in touch with Bukh UK at Poole, they are incredibly helpful and will talk you through anything you're unsure of, as well as providing you with parts.

 

[stevd]

Update to the engine saga.

I definitely need an injector pump service kit, or if it is easier, I will but a new one. Does anyone know where I can find one of these? I couldnt see one listed on T Norris's website. I managed to get fuel to one of the injectors, but not both. I suspect one of the diaphragm's has gone.

I tried getting the engine to run on easy start and one injector but no luck, I was hoping that if I could get it going from that just to see if it would run, but no joy.

When I go back to i I am going to remove the injectors to see if there is any emulsified oil down there, fingers crossed there wont be.

Anyway, back to the fuel injection pump, any ideas where I can buy a service kit / get it refurbed / buy a new one?

Many thanks

 

[Bilgediver]

First of all, thank you all for your quick and very helpful replies.

I still haven't started the engine, but I hope I am heading in the right direction. All though I fear I may have done something wrong after re-reading a reply.

Ok, so when I returned to the engine it was seized again, however it did free off fairly easy.

I first bleed the system as far as I could, following the fuel from the tank through the filter etc. I found that fuel was getting to the injector pump, but not past it. So, off with the injector pump, to find that all the oil in the engine has been contaminated with water, so a nice creamy mess inside. (oh well, ill sort that out after I have got the fuel sorted.) The leaver was seized but after a lot of penetrating oil, a couple of whacks it became free and loose sliding as I think it should.

Next, I found that with the stop solenoid wasnt doing anything with the ignition on. Is that correct? There was no current going to it, so I connected it directly to the battery and found that it was then moving. Possibly a corroded wire. ill look into that at a later date.

Put everything back together, bleed the system through again, and still no fuel from the injection pump :-(


Now, having re-read the replies, I am worried that I may have gotten the logic of the stop solenoid the wrong way around. My experience of diesel engines is limited to cars, so I have assumed that the stop solenoid would require a current to open it up. But now I am wondering if its the other way around, ie no current to get fuel through and a current to stop the fuel? After it was connected directly to the battery for a short-ish period the solenoid would get very warm and begin to smoke. Hence why I now think I have it the wrong way around. Can anyone advise on this?

Also, any ideas on the water issue? I am hoping it maybe a seal on the water pump or something rather than the head gasket!

Many thanks

I believe the stop solonoid on the bukh serves two purposes Not only does it stop the engine when energised but I believe the armature has a length adjustment on it and this controls the max operating position of the fuel pump rack. If the solonoid is screwed in too far you may be cutting the fuel supply off or reducing it. try adjusting the solonoid position outwards.

Have you primed the system to the HP fuel pump. Slacken off the fuel pipe nuts on the top of the pump and see of fuel appears in spurts when the engine is turned and fuel lever on full. Try backing the solonoid of by unscrewing it. If this does not get fuel then maybe the HP delivery valves are stuck and not freeing the air in the pumps. Just loosen the big hex on the top of each pump do not remove! once air stops hissing out as engine is turned over retighten. You should now be able to prime through to the injectors. If not and there has been water in the fuel then who knows!!!!

As others have said, get the water and emulsified oil out of the sump.

 

[30boat]

Update to the engine saga.

I definitely need an injector pump service kit, or if it is easier, I will but a new one. Does anyone know where I can find one of these? I couldnt see one listed on T Norris's website. I managed to get fuel to one of the injectors, but not both. I suspect one of the diaphragm's has gone.

I tried getting the engine to run on easy start and one injector but no luck, I was hoping that if I could get it going from that just to see if it would run, but no joy.

When I go back to i I am going to remove the injectors to see if there is any emulsified oil down there, fingers crossed there wont be.

Anyway, back to the fuel injection pump, any ideas where I can buy a service kit / get it refurbed / buy a new one?

Many thanks

I'm sorry but I don't think you know your way around this engine.The injection pump has no diaphragms it has pistons that are operated by cams .These are connected to the advance and retard mechanism.
I'll say it again.Don't try to run the engine until you've removed all the emulsified oil.If you do you'll risk damaging the engine.
There is nothing you can do to the injection pump.This is a highly specialized area.You must be confusing it with the lift pump that has a diaphragm.

 

[stevd]

Thats exactly right, I do not know my way around this engine, hence why I am asking questions on here. I know my way around enough to understand the basics, however I have never taken an injection pump apart to know how it works, what I do know is that it doesn't work and I know it is mechanical. I know that I can get fuel up to one injector and bleed, but no fuel to the other. Hence why feel that I need to get a new fuel pump / have it refurbed / or try myself.

Do you have experience of refurbing injector pumps on these engines 30boat?

Many thanks

 

[Twister_Ken]

Call Bukh in Poole. They talked me through a problem that Hamble Yacht Services had failed to rectify in three attempts. They're quite used to talking to anxious owners and know at what level to pitch their advice.

 

[stevd]

Call Bukh in Poole. They talked me through a problem that Hamble Yacht Services had failed to rectify in three attempts. They're quite used to talking to anxious owners and know at what level to pitch their advice.

Cheers, I have heard some good things on here about the chaps down there, I think I will give them a shout.

 

[stevd]

I believe the stop solonoid on the bukh serves two purposes Not only does it stop the engine when energised but I believe the armature has a length adjustment on it and this controls the max operating position of the fuel pump rack. If the solonoid is screwed in too far you may be cutting the fuel supply off or reducing it. try adjusting the solonoid position outwards.

I was hoping that the solenoid would have been set correctly as apparently the engine was running fine before it came out of the water!?!?! :-S I shall certainly give it a shot though. Cheers

 

[30boat]

Do you have experience of refurbing injector pumps on these engines 30boat?

Many thanks

Don't take it personally,I've said it for your own good.Yes I have experience of these injection pumps,having taken them apart and reassembled them.Refurbishing them however requires specialized equipment as the tolerances are very fine.
If you wish to continue to try and run the engine in it's present condition then go ahead.I've alerted you to the dangers o doing so.