Volvo penta kad44 only revs to 1200rpm

I think you’d be best testing this on load when you can.
that surging sounds like supercharger surge of old. Which should not really happen on a common rail diesel. Might suggest you have inconsistent boost pressure from it.
But thinking a little more about it, under normal circumstances and the boat in the water under load higher up the rpm, your turbo will be well in play and not the charger. But off load out the water and in neutral, you’ll never get the true normal resulting boost pressure from the turbo. Be like revving a turbo charged car in neutral. You’ll never get the same boost pressure as you’d get in gear and accelerating
 
QBhoy said:
Be like revving a turbo charged car in neutral. You’ll never get the same boost pressure as you’d get in gear and accelerating
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both car and boat turbocharged engines produce no boost whatsoever reving them in neutral, no load == no pressure.
 
petem said:
Stop saying RIGHT! He turns the key fully anticlockwise to stop the engine

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If you look at the switch you will see that the off position is at the vertical, the stop position mark is to the right of it! so my description is correct. Perry has pmd me he is turning it to the stop mark.
 
QBhoy said:
I think you’d be best testing this on load when you can.
that surging sounds like supercharger surge of old. Which should not really happen on a common rail diesel. Might suggest you have inconsistent boost pressure from it.
But thinking a little more about it, under normal circumstances and the boat in the water under load higher up the rpm, your turbo will be well in play and not the charger. But off load out the water and in neutral, you’ll never get the true normal resulting boost pressure from the turbo. Be like revving a turbo charged car in neutral. You’ll never get the same boost pressure as you’d get in gear and accelerating
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The prob with that theory is that the Merc pump works ok with the same infrastructure, the trick is to find out what is different between the two pumps. The issue is, lack of fuel, simplistically speaking, if it was air ie turbo or supercharger it would be black smoke everywhere and as I have said several times the fuel supply and infrastructure has been demonstrated to be good by the fact that the Merc pump works ok. So, again, what is, inside the pump, causing the lack of fuel? I know that several members on here are bein* dismissive but this has been going on for months. A fresh look with a new slant could perhaps solve it!
 
Heckler said:
The prob with that theory is that the Merc pump works ok with the same infrastructure, the trick is to find out what is different between the two pumps. The issue is, lack of fuel, simplistically speaking, if it was air ie turbo or supercharger it would be black smoke everywhere and as I have said several times the fuel supply and infrastructure has been demonstrated to be good by the fact that the Merc pump works ok. So, again, what is, inside the pump, causing the lack of fuel? I know that several members on here are bein* dismissive but this has been going on for months. A fresh look with a new slant could perhaps solve it!
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Why can’t he leave the merc pump on , might be silly question.
 
Heckler said:
The prob with that theory is that the Merc pump works ok with the same infrastructure, the trick is to find out what is different between the two pumps. The issue is, lack of fuel, simplistically speaking, if it was air ie turbo or supercharger it would be black smoke everywhere and as I have said several times the fuel supply and infrastructure has been demonstrated to be good by the fact that the Merc pump works ok. So, again, what is, inside the pump, causing the lack of fuel? I know that several members on here are bein* dismissive but this has been going on for months. A fresh look with a new slant could perhaps solve it!
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Doesn’t seem like a lack of fuel to me. Unless it’s momentarily.
The last video I saw had a little looking like black smoke.
But I still think we could all be guessing until it’s on load properly and tested.
 
kashurst said:
second hand engine? they do pop up from time to time.
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One year in the Med we anchored near 3 recent wrecks .
Large FB boats .Each had been partially broken up so you could ( snorkel ) see the engine room .All three had parts of the motors missing , inc cylinder heads .
Must have been divers , with tools .One had DD,s off Corsica .Another D12 s other was red painted ? .
Just amazed me folks would do that .....worth while the effort ?
Talking 5/7 M deep .
 
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