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Old 30-09-2013, 19:02   #46
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Re: Detroit Diesel Question?

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GG , I hate to say it, cus Ima Detroit lover and owner. But unless ya want to live down here in Louisiana, they are real expensive to maintain, love to use fuel, and parts are getting harder to find, cus a lot of the parts have ended up down here!! The 12-71 is a fine engine, IF it's been maintained!! Theres many, many of them of these engines running in larger shrimp boats down here! and most of the owners would never change as long as parts and service is available! BUT if it were I, I would be searching for boats with different engines, cats if ya can !! There out there, and don't be in a hurry, better to look a little more, and be happier, and have something you will be able to sell down the line!!! Just my 2 cents
Yup, re-sale is most important now. Although, those Hats do seem to sell

I looked at a boat here in Boston with twin Cats. Very nice boat, but I would really have to jamn the kids in. Having trouble getting the space
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Old 16-05-2014, 00:09   #47
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Re: Detroit Diesel Question?

We just bought a Hatteras 53MY to put into the slip next to our Aries-32 sloop, "The Chester P", so we dance on both sides of the room. Our 8V 71-T's were rebuilt in-place 750 hrs ago. They're solid work horses, even after 36 years. Our sloop's auxiliary is a Westerbeke-30
, and equally as old. I redid her 3 years ago and it is very reliable.
The fluid analysis from the engine survey told us the oil was old - service and keep your 92's clean with engine room checks and they'll take care of you. The project here in the next few weeks is to change the oil in both of the old girls like the book say to. Same with transmissions. We've chosen a MY for our live aboard for many of the same reasons already stated on this thread- and luckily we can keep sailing too. :-)
Our DD 8V71T's were rebuilt at 2260 hot by a PO. Apparently they we're run at rated RPM for years going back and forth to MX. We intend more trawler- like speed here in SF Bay.
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Old 16-05-2014, 13:38   #48
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Re: Detroit Diesel Question?

If you are not doing a lot of long range cruising where fuel economy is an issue, the 12-71 is okay. 71 series engines are EXTREMELY common in crewboats, utility boats, and other oilfield vessels, partly because they are just plain cheap to buy or replace, partly because they are very simple and easy engines to work on. There is a great deal of part interchangeability between the various engines with their various number of cylinders. So parts are a little cheaper than most other diesels. But don't let the seller BS you into believing it is a "better" engine than a Cat or EMD or whatever.

Keep in mind that no diesel likes to idle or run at low speeds for very long, especially turbocharged diesels. Diesels have a fairly narrow operating speed band where you get decent fuel econ and proper operation / minimum problems. If you want to go slow and cheap, you mustn't be overpowered.
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Old 16-05-2014, 14:48   #49
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Re: Detroit Diesel Question?

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If you are not doing a lot of long range cruising where fuel economy is an issue, the 12-71 is okay. 71 series engines are EXTREMELY common in crewboats, utility boats, and other oilfield vessels, partly because they are just plain cheap to buy or replace, partly because they are very simple and easy engines to work on. There is a great deal of part interchangeability between the various engines with their various number of cylinders. So parts are a little cheaper than most other diesels. But don't let the seller BS you into believing it is a "better" engine than a Cat or EMD or whatever.

Keep in mind that no diesel likes to idle or run at low speeds for very long, especially turbocharged diesels. Diesels have a fairly narrow operating speed band where you get decent fuel econ and proper operation / minimum problems. If you want to go slow and cheap, you mustn't be overpowered.
But, if you run them up every couple hours, then you should be ok?
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Old 16-05-2014, 16:19   #50
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Re: Detroit Diesel Question?

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But, if you run them up every couple hours, then you should be ok?
Hmmmmm... not sure how qualified I am to completely answer that, but certainly that would be better than running half throttle for days at a time.

I think a Detroit rep would be able to help u on that.

Do you plan on cruising a lot?

When I was running crew boats we always ran wide open except when a slow bell was required or in low vis or when maneuvering. This usually powered by 3 or more 12-71s.
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