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post #11 of 47 Old 03-10-2016
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Re: Turbo diesels

Another issue with turbo failure is that if it is a dramatic failure small parts of the compressor blades, housing and or bearing can be sucked into the engine, doing lots of harm. Mostly happens with higher RPM turbo motors but I suppose it could happen with any turbocharged motor. Miniwaska has issues with his turbocharged engine I believe, so perhaps he will chime in about what happened to his. But it really depends on the failure point as some exhaust should be able to get around the vanes to get out and fresh air can get in, so it may run to a fashion, but more like limp home to the port, not finish a long passage. I believe the largest normally aspirated diesel you can get anymore (for a normal sailboat) is going to be around 75 HP for a Beta, but you can put a much smaller engine with a turbo to get the same power, that is often a deciding factor. I certainly would prefer the mechanical simplicity of a normally aspirated mechanical injected engine.

A bigger issue with the modern high fuel pressure diesels, (common rail) likely of greater issue for a cruising boat(you could carry a spare turbo they are not that big, and easy enough to replace in the field), is the fuel systems are very sensitive to fuel quality and cleanliness. If you ruin a modern high pressure fuel pump you are looking at replacing the entire fuel system (on VW's they even replace the fuel tank and all fuel lines injectors, filter units, the whole kit and caboodle) and that would be quite a bit harder to cope with in a remote port. The Bosh pumps have not proven to be terribly reliable, and I have not read about the exact cause, some say moisture causing corrosion, others say dirt, while even others just blame poor fuel, with incorrect additives.

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post #12 of 47 Old 03-10-2016
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Re: Turbo diesels

And don't forget the heat. I've seen turbo's on big Generators get red hot, you can see the cooler air swirl around as it gets heated up.
At least on an NA the heat goes out the mixing elbow right away.
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Re: Turbo diesels

Wow

Good thing the d-mm thing has sails.

Fortunately I have have the TE 75 hp not its replacement the 80hp digitally controlled common rail one. Sometimes progress is not progress for all.

Don't have true polishing system but do have filters in run from tanks and on return to tanks as well as the usual twin Racors and the filter on the engine.

They have portable polishing systems both down in the islands and up in the north east. Is it advisable to get this done and if so at what intervals.

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Last edited by outbound; 03-10-2016 at 10:29 PM.
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post #14 of 47 Old 03-11-2016
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Re: Turbo diesels

[quote=outbound;3385225]Wow
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Wow

...
They have portable polishing systems both down in the islands and up in the north east. Is it advisable to get this done and if so at what intervals.

"Polishing" is something of a recent Trend, with a profitable Trendy name...
When I bought my most recent boat, I had no idea how long the Diesel fuel had been in it, so I drained it all out, and put it in the tank of my Mercedes Tank, where it cheerfully Dieseled away in a month or so. Good Diesel.
Fresh Diesel fuel was put in the Boat, but only 5 gallons. 5 gallons lasts me a long time.

There are those that insist on huge Diesel tanks, just like those used in Trendy Diesel Powerboats... on a Sailboat. A... Sail... Boat...

If one has a Sailboat with a full hundred gallon Diesel tank, and one has goals that involves burning that hundred gallons in a month or so, Polishing is not needed.

If one has a Sailboat with a full hundred gallon Diesel tank, and one has goals that involves sitting Dockside, waiting for just the right time to take off on short notice, if ever...

Polishing: "There's a sucker born every minute."

¨Erindipity
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post #15 of 47 Old 03-11-2016 Thread Starter
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Re: Turbo diesels

Guess we use our boats differently.

Twice a year I have 1500+ nm to cover. I have done it with the Salty Dawgs. So far there have been days of no wind and days of gale force wind. Still we go through a lot of diesel on the no wind days. It's common for folks with inadequate tankage to divert to Bermuda to get fuel.

Yes it's a sailboat and both when coastal in New England or island hopping the main problem is leaving the diesel on long enough to heat up but on passage there are days it doesn't go off. From talking with other cruisers be they hopped down the west coast and done the canal or started in Canada it's the same thing. Two passages with days of engine use then two blocks of months of little or no engine use. Especially given you can even sail off your anchor not uncommonly.

Gone to Bermuda multiple times with no engine use because we were racing. But cruising you want three or four on the boat and at least one of them has a time window. Or you're watching the weather and know you need to make your easting now or get below this latitude ASAP to miss the nasties coming at you three days from now. So this purist attitude of "it's a sailboat " loses its appeal and the engine goes on.

Reviewed our quick books for last year looks like ~110g down, ~80g back,~ 45g winter, ~55g summer. So burned ~190g in 20d(passages) and ~ 100g the whole rest of the year. Fuel up here is fine. Even comes with biocide in it. Fuel down there ?????? So I ask about polishing.

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post #16 of 47 Old 03-11-2016
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Re: Turbo diesels

Unless already in service one day soon we MAY deal with Urea (DEF) on boats emissions requirements for Marine AFAIK are not there yet. Someone can check me on this I deal with big Trucks and Fueling so DEF is a big deal lately.

On the polishing issue we all polish through the normal return to the Tank every time the engine is running. How much is the question. Every system is different. A polishing system would ideally pull from the bottom on one end and return to the top on the other end, but again unless the fuel sits unused for a long time there's no need. One nice thing is you could notice a water issue before the engine does because the polisher would pick up lower than the engine. Of course this is all things being equal on a stationary tank.
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Re: Turbo diesels

Well Al good to know. Just another reason to be real kind and attentive to your engine. They charge a lot for piss and you need to be real careful the piss is fresh piss or it fouls up the engine. Believe for many car diesels it has an effective shelf life of only 90 d which may be a hassle if we are forced to use it in boats.

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Re: Turbo diesels

Hi ......,

If the turbo fails the engine will idle at best with smoke due to limited amount of air entering the engine.
Yes you can change it at sea. Make sure to have all the gaskets and clamps.
Any debris from a turbo failure can cause internal damage to the engine.

Please contact me direct for any further assistance,

Capt. John J Farrell
Product Support Specialist

MACK_Color-EMAIL

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Re: Turbo diesels

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Well Al good to know. Just another reason to be real kind and attentive to your engine. They charge a lot for piss and you need to be real careful the piss is fresh piss or it fouls up the engine. Believe for many car diesels it has an effective shelf life of only 90 d which may be a hassle if we are forced to use it in boats.
I think the VW urea tanks need to be filled every 15,000 miles so I imagine the shelf life is a bit more than 90 days. But the timing is aligned to match the oil change interval.

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Discussed this with my jeep wrench. What I said was "effective " shelf life. Given average miles miles driven the stuff will sit in your car for awhile so poring in DEF more than 90d old is not advisable.

Also told there is a wide variation in the quality of DEF. Best to use oem for a few $ more if you are going to hang on to the vehicle but still check the date on it.
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