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444/44/396 turbo not spooling up

DIESEL engine, transmission and generator repair and maintenance discussion forum.
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Huckleberry
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444/44/396 turbo not spooling up

Postby Huckleberry » November 4th, 2018, 1:30 am

Bought a 2005 44 with volvo diesels that have under 300 hrs . At sea trial in TN it ran perfect . Survey showed air filters were deteriorating so the seller replaced them . Boat was piloted from its slip to travel lift then to trailer and transported to AZ .
Now the starboard turbo doesn't spool up . Is there a line or hose or something they may have accidentally broke or disconnected that would prevent the turbo from working ?
Engines start and run perfect but , no starboard turbo . :cry: :help:
Huck

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Re: 444/44/396 turbo not spooling up

Postby mjk1040 » November 4th, 2018, 5:31 am

I find a good Volvo tech to check it out. May be just a sensor!
Mike :down:
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Re: 444/44/396 turbo not spooling up

Postby pepmyster » November 4th, 2018, 6:11 am

Check the way the air filter was installed, might of missed aclamp on sealing it, then, like mjk1040, said, have a Volvo tech check it, or, any qualified diesel tech.

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Re: 444/44/396 turbo not spooling up

Postby Viper » November 4th, 2018, 9:31 am

What is leading you to conclude that it's a turbo problem and not a fuel delivery issue? Is the turbo spinning? Is there any oil or exhaust leak around the turbo? Do you have Racor primary filters? Are they clean? Are you getting a lot of smoke out the exhaust? Is engine instrumentation raising any red flags?

Unfortunately I can't look anything up for about a week but a serial number would be a good place to start.
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Huckleberry
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Re: 444/44/396 turbo not spooling up

Postby Huckleberry » November 4th, 2018, 9:11 pm

When under way and in the engine compartment I can hear the port turbo spool up but not the starboard . Engine runs perfect but no turbo . It ran perfect before they installed the new air filters and it was only ran at idle from its slip to travel lift . Common sense indicates they did something when they installed the filter . Hoping some one has been there done that and could point me in the right direction .
Huck
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Re: 444/44/396 turbo not spooling up

Postby bud37 » November 4th, 2018, 9:23 pm

I will admit I don't know about marine diesels, but I might go down there and compare the one that works to the other.....should be the same, look for a wire off, hose loose or broken anything, check where feet may have been.....good luck man, hopefully something simple...... :beergood:
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Re: 444/44/396 turbo not spooling up

Postby Flyboy2000 » November 5th, 2018, 12:49 am

Is the engine accelerating? As long as its got lubrication the Turbo should spool up. Does it have a wastegate? Issue?
Also, Could you tell me who you used to transport/trailer your boat, and how much it cost you? You can Private message me if you like...

Lee
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Re: 444/44/396 turbo not spooling up

Postby Tireless » November 5th, 2018, 2:47 pm

I have always been told that when things are working fine and then they don't. Always look at the last thing that was touched. I have also been advised that when this happens look for leaks. You should be able to hear or feel it in and around your hoses. Good luck. When you figure it out please post... Thanks.
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Re: 444/44/396 turbo not spooling up

Postby Huckleberry » November 5th, 2018, 9:23 pm

Exactly my thoughts Tireless . Thanks and when I get it fixed I will certainly post it , hopefully to help some one else .
Huck
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Re: 444/44/396 turbo not spooling up

Postby voyager57 » November 13th, 2018, 10:32 am

I've replaced two turbo's on my Volvo D12s already. Unfortunately they are a wearable part, but diagnosing is fairly easy. When the engine is cool, pull out the air filter. The turbo will be right there. Try to rotate the turbo fan blades by hand (see attached photo). They should rotate freely very easily. If they do, that's a good thing. There's an inexpensive boost sensor that could have gone bad. If it did, it does not sense the turbo producing any boost and won't deliver more fuel to the engine to go past likely 1,000 RPM, and thus your turbo won't spool up.

If you can't rotate the blades by hand, there could be a carbon buildup that needs to be broken loose so it spins freely. This happens when the engines sit for awhile without being put under load. Idling at the dock or slow cruising without getting up and going is a turbo's worst enemy. You can break it free by carefully working a small flat head screwdriver around the fan blades to knock the black carbon off until it spins. If you get it free, take the boat out and put it under load to see if you get the boost. If not, report back and we can talk about next steps. Good luck.

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