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Old 29 September 2014, 17:54   #11
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I would have expected a waste gate to keep the boost pressure regulated and not allow it to over boost possibly damaging the engine and your symptom sounds like one that is stuck open, ie runs great but no power under load in the water
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Old 29 September 2014, 17:55   #12
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It doesn't smoke at all when on the water and for the last two months the boat was flying well for a pacific, it was jumping on to the plane and black smoke was pouring out when under load, I was getting 26knots but now only 17 !! Could a damage hose on the turbo cause this only because they aren't in the best of condition !!
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Old 29 September 2014, 18:03   #13
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It doesn't smoke at all when on the water and for the last two months the boat was flying well for a pacific, it was jumping on to the plane and black smoke was pouring out when under load, I was getting 26knots but now only 17 !! Could a damage hose on the turbo cause this only because they aren't in the best of condition !!
yes! I think there is a small hose from the manifold to the pump which measures turbo boost & tells the pump to shovel more coal on, if that's split then the pump will not supply enough fuel

if its an air leak between the turbo & manifold you would expect loads of black smoke

my first step would be to find a gauge & measure the turbo boost it doesn't need to be anything fancy any pressure guage that can read up to about 20psi will do

im not sure what pressure they run at but it shouldn't be too difficult to find out the boost pressure required
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Old 29 September 2014, 18:08   #14
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Thanks I will have another good look over her tomorrow and get some pics , I'm not sure where I would connect the pressure gauge to ??
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Old 29 September 2014, 18:14   #15
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anywhere in the manifold system after the turbo will do there is usually a gauge port somewhere or you may need to locate a suitable hose and make up a tee of some sort

sorry I cant be more specific but im not totally familiar with the mermaid

pics might help
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Old 29 September 2014, 19:09   #16
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Hi all


Could be bearings gone on the turbo.Worth putting it on computer.Just to make sure nothing electrical.
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Old 30 September 2014, 06:21   #17
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Hi all


Could be bearings gone on the turbo.Worth putting it on computer.Just to make sure nothing electrical.
No obd on an old mermaid.
No wastegate either iirc
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Old 30 September 2014, 08:05   #18
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Try running it on a different fuel source is out if can. Might just be restricted fuel flow
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Old 30 September 2014, 08:53   #19
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Hi all from what i gather of turbo's, if bearing failure the turbo will not reach peak revs.As you describe you have play in the turbo.check for air and oil leaks to.
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Old 30 September 2014, 12:12   #20
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Might try the fuel source tomorrow that's not a bad idea !! Also I spoke to a mermaid engineer today he said even with bearing play the turbo will still perform well and they are bullet proof, he seemed to think the only thing it could be is leaking manifold gasket so need to go and take a new look !!!
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