Bukh DV20 strange(?) noise

[oldharry]

I used to have a Bukh and got seawater in the oil. You should have a careful look at the seals on your water pump driveshaft, which is the most likely source of water ingress. If this turns out to be the case, the pump drive shaft bearings will be shot, which could account for the grinding noise. I seem to remember the hand start mechanism shared this bearing. Not difficult to replace. If the seawater has been in the engine for some time, expect further trouble - I certainly had some.

Even if the seals are good, if the pee hole between them is blocked (which it does very easily) then it will be dry outside, but water still leaking into the sump through the seals. Had that on my Bukh. The seals are set up face to face, and if the pump body seal fails, even if the inner seal is good it can not stop water getting in to the engine. Seals only work one way, and it takes very little positive pressure to blow past it from the outside.

 

[James_Calvert]

Regarding draining the contaminated oil I found I could get the last pint or so out by removing the drain plug in the sump. Obviously I needed a very shallow collector to slide along the bilge under the engine.

I never used flushing oil, but the cheapest supermarket oil I could find, ran the engine, drained it again and refilled.

 

[James_Calvert]

Probably about a half pint, thinking about it.

 

[Pords]

Well took the starter chain apart and found water in casing and gunk which wasn't there before. Also on inspection I realised straight away what I did wrong on reassembling which was put the back bearing in back to front hence chain sprocket sitting proud and rubbed against front casing and catching starter handle sprocket. That was the grinding I heard when I initially started up. This I believe has also caused the pump seals to fail which I have stripped and look buggered. The water is fresh as I haven't launched and was running up with a hose and bucket. I have new oil in the engine after flushing twice but with the old pump so no good as milky. Will get parts to reassemble pump and casing gasket then oump out and go for another flushing before new filters and more fresh oil. Hope I caught it in time but will gave a chat with Bukh on Monday. Thanks for all your advice.

 

[Champagne Murphy]

Good news!Simple fix now.

 

[Pords]

Further update to woes. Waterpump fixed but water still getting in to the engine. Did a couple of flushes but no improvement to the milky goo. Took the sump plug off and drained and after 5 minutes checked underneather to see every now and then a trickle of water come out of the sump. Water was still being gravity fed from a bucket so took water pump off and checked no water still getting in the back and all ok there. So methinks head needs looking at which means stripping down and finding what needs doing. Which ever way i look at it money has to be thrown at the problem. Will wait and see what's what and then decide how to move forward. If its going to cost an arm and a leg i may as well think about a beta 25.

 

[RichardS]

Oh dear, if water is flowing through that quickly then that's a really bad case of a blown gasket. I'm a bit surprised that the engine even runs with such a loss of compression.

Probably a head skim and new gasket required so probably not expensive if you can remove the head yourself but who wants the hassle?

Richard

 

[Champagne Murphy]

Ah. Bad luck. But if it is the head gasket it's still relatively easy.

 

[Pords]

Hopefully it is just the head but it was running like a bag of old spanners, and the rattle which I believe is coming from the counterweights at the bottom of the engine is more prominent. Think there's more problems going on then just the head.

 

[seumask]

You may want to talk to Marine Enterprises in Dorset. They do Bukh's and you may get a return for your old engine from them. I suspect it would be a lot less complicated to put in a ex lifeboat Bukh of the same variety as you currently have then fit a new engine of another make.
They advertise on Apollo duck
http://engines.apolloduck.co.uk/feature.phtml?id=344336

 

[Pords]

Thanks guys. Took engine part today and found that when i took the elbow of the engine water run out from the exhaust exchange and that the whole exhaust up until the elbow was full of water, Water lock completely full. Now this is what i think i have done. Whilst gravity feeding the system i have pressurised it as i didn't take the hose out of the bucket which was located on the seat in the cockpit and well above the engine whils waiting to do an oil change. This i think completely filled up the system and back in through the exhaust. The head had water in it where it shouldn't. When i took the exhaust box off all gaskets still good. I have decided that now its apart to overhaul it and double check everything including having the head tested and refurbed if needed. What should i change once its apart and out of the boat before putting back together?

 

[Champagne Murphy]

Thanks guys. Took engine part today and found that when i took the elbow of the engine water run out from the exhaust exchange and that the whole exhaust up until the elbow was full of water, Water lock completely full. Now this is what i think i have done. Whilst gravity feeding the system i have pressurised it as i didn't take the hose out of the bucket which was located on the seat in the cockpit and well above the engine whils waiting to do an oil change. This i think completely filled up the system and back in through the exhaust. The head had water in it where it shouldn't. When i took the exhaust box off all gaskets still good. I have decided that now its apart to overhaul it and double check everything including having the head tested and refurbed if needed. What should i change once its apart and out of the boat before putting back together?

Probably a good idea to replace the main bearing And the rings. Check the ring gap to see if you need new wet liners. Get the injectors and high pressure pump serviced. Get a complete new gaskets etc, it works out a lot cheaper.
The bits and pieces are certainly not cheap, in fact Bulb's pricing is nothing short of scandalous, bit you'll probably get another 30 years out of it.

 

[Pords]

Ok that sounds like the start of my shopping list with Bukh. Will wait unto completely stripped to see what else could do with changing. I was surprised how clean it was inside albeit I had flushed it for a 19 year old engine. Pretty well engineered and solid.

 

[Champagne Murphy]

Ok that sounds like the start of my shopping list with Bukh. Will wait unto completely stripped to see what else could do with changing. I was surprised how clean it was inside albeit I had flushed it for a 19 year old engine. Pretty well engineered and solid.

Pords,
If it's any help i have lots of photos taken during the process. Very happy to share them although there are quite a lot so if there are specifics you want to see.....

Just pm me and I'll send what i have
Cheers

 

[RichardS]

Thanks guys. Took engine part today and found that when i took the elbow of the engine water run out from the exhaust exchange and that the whole exhaust up until the elbow was full of water, Water lock completely full. Now this is what i think i have done. Whilst gravity feeding the system i have pressurised it as i didn't take the hose out of the bucket which was located on the seat in the cockpit and well above the engine whils waiting to do an oil change. This i think completely filled up the system and back in through the exhaust. The head had water in it where it shouldn't. When i took the exhaust box off all gaskets still good. I have decided that now its apart to overhaul it and double check everything including having the head tested and refurbed if needed. What should i change once its apart and out of the boat before putting back together?

Oops! I mentioned that head gasket failure seemed unlikely so I would have just removed the injectors/glow plugs and blown the water out, changed the oil and run her up to temperature asap on the basis that no long term harm will be done. Of course, if she didn't run properly, then I would have started stripping down.

Richard

 

[Pords]

Pords,
If it's any help i have lots of photos taken during the process. Very happy to share them although there are quite a lot so if there are specifics you want to see.....

Just pm me and I'll send what i have
Cheers

Thanks for that, I will defo contact you if i need assistance. Was going to document as i go like you did. I have a mechanic friend who is going to help with the stripping and putting back together. He rebuilt my old Yanmar 1GM10 for my old boat and did a very good job of it. Hopefully will be able to keep the costs down but there's no getting round Bukh prices.

 

[Champagne Murphy]

Thanks for that, I will defo contact you if i need assistance. Was going to document as i go like you did. I have a mechanic friend who is going to help with the stripping and putting back together. He rebuilt my old Yanmar 1GM10 for my old boat and did a very good job of it. Hopefully will be able to keep the costs down but there's no getting round Bukh prices.

Exactly what i did! A mate who knew what he was doing. But what am excellent way to learn.

 

[Bol]

Hi everybody
A few weeks ago I was worried by a certain noise coming from the 'Raised Hand Start', ie the casing containing the chain that leads the movement to the water pump and the hand starting mechanism.

I bought bushings, bearings and a new chain from the Italian Bukh distributor and overhauled it.
Unfortunately I still feel something strange:
The noise seems that of a chain that runs with some play, but I checked the measurements and according to the specifications of the manual they are correct.

Is there someone who has the DV20 and that had experience about this issue or can tell me if what you feel may be normal?

Thank you all

Francesco

Hi Francesco
I am experiencing a similar noise issue om my engine and would be interested to know if you found the cause.
Thanks Martin