Volvo Penta MD2010 rebuilt ,now throwing fuel from exhaust ?

[grafozz]

HELP!
I had a local Co . rebuild my 2010 , new rings, shells ,valves , lift /water pumps , injectors , heat exchanger etc , everything except pistons really .
last week in roughish seas heading into harbour it stopped , and would only run at idle , very rich , lots of black smoke then not at all .
the head was removed and all looks ok , exhaust ports were partially coked up , the engine has only done about 150 hours , so this was odd ?
It appears to have been running very rich and had been blowing some black smoke from the exhaust at 1/2 + throttle ?

I had a thought that the fuel return pipe may be blocked and this could cause excessive fuelling ?
so blew pumped air back through the line , which goes back to the tank , and there was some resistance but it is now clear ,
could this have been the cause of overfuelling ?
The tank breather is all clear too .

One other thing , the lift pump was found to be leaking fuel into the sump and was changed , it took 4 oil changes to be clear of diesel !
The engineer is puzzled and we don,t know where to go next .

I would be grateful for any ideas , suggestions , please ?

 

[duncan99210]

Have you checked that the exhaust elbow is clear? A restricted elbow might be contributing to the problems.

 

[peteK]

This problem comes up from time to time on here and even has the experts baffled,as already said it usually the exhaust elbow blocked which is common on these engines.

 

[RichardS]

HELP!
I had a local Co . rebuild my 2010 , new rings, shells ,valves , lift /water pumps , injectors , heat exchanger etc , everything except pistons really .
last week in roughish seas heading into harbour it stopped , and would only run at idle , very rich , lots of black smoke then not at all .
the head was removed and all looks ok , exhaust ports were partially coked up , the engine has only done about 150 hours , so this was odd ?
It appears to have been running very rich and had been blowing some black smoke from the exhaust at 1/2 + throttle ?

I had a thought that the fuel return pipe may be blocked and this could cause excessive fuelling ?
so blew pumped air back through the line , which goes back to the tank , and there was some resistance but it is now clear ,
could this have been the cause of overfuelling ?
The tank breather is all clear too .

One other thing , the lift pump was found to be leaking fuel into the sump and was changed , it took 4 oil changes to be clear of diesel !
The engineer is puzzled and we don,t know where to go next .

I would be grateful for any ideas , suggestions , please ?

I would have thought that a slight initial resistance when blowing through the tank return would not be a problem as the injection pump would easily overcome anything that you could blow through.

Presumably the exhaust elbow was checked when the engine was rebuilt? It's worth checking again but after 150 hours I'd be surprised if that's the problem.

Was the injection pump set up correctly after the re-build?

Richard

 

[grafozz]

I would have thought that a slight initial resistance when blowing through the tank return would not be a problem as the injection pump would easily overcome anything that you could blow through.

Presumably the exhaust elbow was checked when the engine was rebuilt? It's worth checking again but after 150 hours I'd be surprised if that's the problem.

Was the injection pump set up correctly after the re-build?

Richard

Thanks , the exhaust elbow is a new s/steel type , the head was rebuilt and a new heat exchanger was fitted .
I asked about the injection pump and the reply was , we removed it and refitted it , no work or re-setting was done .
If this is done would the pump need to be re- set ?

The more I look into it the more I think it was caused by too much fuel , so the pump setting question is really important .
If the engine is fed excessive amounts of fuel then this would cause higher compression ?

Although I can not smell diesel in the sump oil , there was too much oil laying under the engine .

Latest is they are going to remove the engine , again , and take it back to the workshop and strip and try to find out what the issue is .

 

[grafozz]

Engine now blown up !!

Entering Vathy lastweek the 4engine stopped and made strange noises when trying to re start .

 

[RichardS]

Engine now blown up !!

Entering Vathy lastweek the 4engine stopped and made strange noises when trying to re start .

That's really bad news. I'm sorry.

It doesn't help you but, in my experience, as soon as one allows "professional" mechanics, auto or marine, anywhere near an engine to do any serious work, in most cases that engine's days are numbered.

Richard

 

[Airscrew]

Graf,

sorry to hear of your woes.
We had an old VP in the UK, and the more I tinkered the worse it got.
Decided not to spend money on Engineers, but bite the bullet and replaced last year with a Buhk.

Out of interest, where do you have the work done?
We have a yacht in Greece, wintered in Vliho, but maintenance done in Nidri.

Also,
hope you avoided the worst of the storm a couple of weeks ago.
We were further north, but Kef was hit really badly.
Back in UK now.

 

[grafozz]

Graf,

sorry to hear of your woes.
We had an old VP in the UK, and the more I tinkered the worse it got.
Decided not to spend money on Engineers, but bite the bullet and replaced last year with a Buhk.

Out of interest, where do you have the work done?
We have a yacht in Greece, wintered in Vliho, but maintenance done in Nidri.

Also,
hope you avoided the worst of the storm a couple of weeks ago.
We were further north, but Kef was hit really badly.
Back in UK now.

I

 

[grafozz]

I was very lucky , only lost 1x 150w solar panel and 2x fenders , we helped out during the clear up to balance out my fortune !

I am now questioning whether to rebuild or buy another engine and sell off the new parts .

I am also looking into a complete change of tack - fitting a 10/13kw electric motor using lithium batteries ,

theory being I have 1x rebuilt VP diesel to charge the batteries and still have 1x engine for propulsion .
It seems like an opportunity to reduce the risk of another engine blow up !!