VOLVO PENTA TAMD22 P-B

[JS PLEASURE]

Loss of power to my Volvo Penta tmd22 p-b diesel engine.. Turbo serviced. Do not know if it is valve or fuel injectors, not sure what to do next as I am not a mechanic. Any ideas. Drop off of power instant. Also black smoke. In neutral 4,000 plus, in gear between 2,000 and 2,200, had turbo reconditioned but not the problem. Fuel system checked all the way through fine. Re timed is good. Engine is very lumpy under power.

 

[PaulRainbow]

Not much information to go on, so suggestions are likely to be vague, at best.

A good place to start might be the fuel supply/filters.

 

[Bobc]

Check the heat exchanger for holes in the casing. My one had corroded away and was letting all the pressure from the turbo out. Also check that the exhaust elbow isn't blocked. Also check that the turbo wastegate valve isn't stuck open (you can do tis by removing the exhaust elbow).

I'm assuming that you've already checked fuel filters?

 

[Plum]

Loss of power to my Volvo Penta tmd22 p-b diesel engine.. Turbo serviced. Do not know if it is valve or fuel injectors, not sure what to do next as I am not a mechanic. Any ideas.

What are the symptoms? Does it reach full revs in neutral? Does it reach full revs in gear underway? Is your hull bottom clean? Is your prop clean with nothing wrapped around it? Did you get full power just after the turbo was serviced?

www.solocoastalsailing.co.uk

 

[scottie]

Is there any black smoke which is an indication of unburnt fuel
Was the fall off in power sudden or gradual ?

 

[JS PLEASURE]

Is there any black smoke which is an indication of unburnt fuel
Was the fall off in power sudden or gradual ?

Drop off of power instant. Also black smoke. In neutral 4,000 plus, in gear between 2,000 and 2,200, had turbo reconditioned but not the problem. Fuel system checked all the way through fine. Re timed is good. Engine is very lumpy under power.

 

[Bobc]

Turbo wastegate stuck open would be the first place I'd look based on what you say above.

 

[Beneteau381]

You need to check the boost pressure to make sure you are getting full pressure under load. Not loaded it will rev to the full amount without boost. Most likely as Bobc says, wastegate actuator stuck open, they are prone to seizing. Get a pair of mole grips on the actuating rod and make sure it moves freely both ways. If it is seized you will curse yourself for paying for a rebuilt turbo!

 

[Beneteau381]

You need to check the boost pressure to make sure you are getting full pressure under load. Not loaded it will rev to the full amount without boost. Most likely as Bobc says, wastegate actuator stuck open, they are prone to seizing. Get a pair of mole grips on the actuating rod and make sure it moves freely both ways. If it is seized you will curse yourself for paying for a rebuilt turbo!

PS Ive got a set of car turbo injectors and pipes for sale, they are the later dual injection type

 

[JS PLEASURE]

Have checked this and it is okay.

 

[Bobc]

Check the air pressure in the inlet manifold.

Have you checked that the exhaust elbow is clear yet?

 

[JS PLEASURE]

Yes all okay, thankyou

 

[Bobc]

Usually, lack of revs under load combined with smoke would indicate that there isn't enough air or that the ignition timing is too retarded. The turbo versions of that engine have the ignition more retarded than the non-turbo version, so I still think it's down to lack of air pressure from the turbo somewhere.

 

[Bobc]

Only other thing I can suggest is to check the cylinder compressions. I have a compression tester you can borrow, but I live in Oxfordshire.

 

[Beneteau381]

Have checked this and it is okay.

what was the pressure?

 

[JS PLEASURE]

Waiting for boat to come out and then can check pressure and injectors. Thank you for your comments.

 

[Beneteau381]

Waiting for boat to come out and then can check pressure and injectors. Thank you for your comments.

Need to run engine to check turbo boost pressures, so easier in water? To get to the issue of your symptoms, the turbo boost pressure has to be checked. It is impossible to check out of the water.

 

[Bobc]

One other thought.

There is a small vacuum pipe which runs from the turbo to the top of the injection pump. This increases the amount of fuel sent to the injectors as the turbo gets going. If this is not connected at one end (I'm thinking maybe forgot to connect it at the turbo end), then you will not get the revs as the pump will not send enough fuel to the injectors.

Could it be that simple?

 

[JS PLEASURE]

Thanks for the input, the pipes are connected. Turbo has been reconditioned. Not a mechanic but I am thinking of disconnecting injectors one at a time and check compressions. Then check injectors one at a time as well.

 

[Bobc]

Thanks for the input, the pipes are connected. Turbo has been reconditioned. Not a mechanic but I am thinking of disconnecting injectors one at a time and check compressions. Then check injectors one at a time as well.

My experience with that engine, is that if the compressions are down and/or you have injectors not atomising the fuel correctly, you will get clouds of light grey smoke on cold start and for a few minutes until the engine starts to get warm.

Do you have a vacuum gauge? If so, remove the vacuum pipe from the injection pump and stick the gauge on it. You should see the vacuum increase as you rev the engine.