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Old 11-25-2019, 02:05 PM   #1
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16 Years, 500 hr and new motor

What you think of a 16 year old boat advertised as only 500 hours on the hull and half of that with a new Cummins 6BT5.9M2? How did they manage to need a new engine at 250 hours?

How do I tell if this is this a cream puff or a red flag?
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Old 11-25-2019, 02:11 PM   #2
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There's certainly more to the story. Ask.

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Old 11-25-2019, 02:16 PM   #3
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Sounds like Nordic Tug, smaller boat with huge horsepower, owner wants to run it a low speed and it can be hard on the engine idling all of the time... I had a friend with a NT 32 and a Cummins, it endlessly gave him trouble because he wanted to idle around at 6 knots and the engine didn't like it.

I think he would have been much happier with 60-100 hp the way he wanted to operate his vessel.
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Old 11-25-2019, 02:18 PM   #4
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It's not a big deal many times (the act of swapping, not the catastrophic failure). Not the same as a new motor in a car, a ton of things could have happened from a closed raw water seacock to aftercooler issues, to oil leak or ruptured hose to some sort of water ingestion etc. If they can't tell you why it was swapped, then I would be concerned.
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Old 11-25-2019, 05:20 PM   #5
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I will link you to an article about gas versus diesel, in it you will read that using a motor a little is harder on it than using it constantly. I linked in another thread of a video put out my Mercury in the 1950's of two of their outboards running for 50,000 hours with a mid 25,000 servicing. Of course the purpose of the vid is to show Merc's can take it, but it also illustrates using a motor a lot is less stressful than not using it much at all.

On my now re-powered boat, I was thrilled when the motor only showed 350 hours, how wrong I was, the insides of the motor particularly the heat exchanger were all cruded up.

https://www.yachtsurvey.com/GasDiesel.htm
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Old 11-26-2019, 09:47 AM   #6
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Sometimes engines just grenade. Even diesels. It's rare, but it's why manufacturers have warranties. I've seen three gas big blocks (different boats, several years apart) do so within their first 3 hours.

Years ago Cat was having an issue with some blocks on their 3116's. Many engines couldn't make it much past 500 hours. Stuff happens.
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Old 11-26-2019, 10:18 AM   #7
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Shrew,
3 big gas engines “granading” when new is probably because of some mistake, stupidity or negligence in boat building. When I worked at Uniflite an experienced person there said many to most boats experience more use and abuse during construction that later. And Uniflite was considered one of the best boats at the time.

And of course things happen building engines too. Far less probably.
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Old 11-26-2019, 11:37 AM   #8
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Quote:
Originally Posted by AKDoug View Post
Sounds like Nordic Tug, smaller boat with huge horsepower, owner wants to run it a low speed and it can be hard on the engine idling all of the time... I had a friend with a NT 32 and a Cummins, it endlessly gave him trouble because he wanted to idle around at 6 knots and the engine didn't like it.

I think he would have been much happier with 60-100 hp the way he wanted to operate his vessel.
You Willard owners are always picking on us big horsepowered NT owners.

LOL
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Old 11-26-2019, 12:31 PM   #9
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Shrew,
3 big gas engines “granading” when new is probably because of some mistake, stupidity or negligence in boat building.
I agree. though I've suspected the issue was with engine assembly rather than installation, anything is possible.
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Old 11-26-2019, 03:16 PM   #10
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I agree. though I've suspected the issue was with engine assembly rather than installation, anything is possible.
Mainship replaced several CAT engines in the 390 models because of poor installation. (poor exhaust system design)

I also believe many many more engines die from being run too hard, or being overloaded as opposed to be run too lightly.

But any engine manufacturer can make a bad run of engines due to many reasons.

I would not assume a reason for short engine life.
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Old 11-26-2019, 03:24 PM   #11
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There's certainly more to the story. Ask.

Greg
This was the only good recommendation or response. You ask on a forum where none of us have any idea why or what took place or the history or condition of the boat.
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Old 11-26-2019, 03:30 PM   #12
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This was the only good recommendation or response. You ask on a forum where none of us have any idea why or what took place or the history or condition of the boat.

Close the thread, the almighty has spoken. Only one good response here.
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Old 11-26-2019, 03:40 PM   #13
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I

On my now re-powered boat, I was thrilled when the motor only showed 350 hours, how wrong I was, the insides of the motor particularly the heat exchanger were all cruded up.
The highlighted bit is surely lack of maintenance not lack of use.
Easy fix none the less.
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Old 11-26-2019, 03:49 PM   #14
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We looked at a Bayliner 4788 that had Cummins engines in it. The boat was a 2000, I think. When I looked in the engine room I was amazed how nice looking the engines were. I asked the broker about them and he said that Cummins had replaced the engines about 3 or 4 years earlier. He said the PO of the boat knew someone at Cummins and got them to replace the engines for some reason. The really strange thing was there was no mention in the listing about new engines and the broker never mentioned them until I asked. You would think that this would have been the first thing in the listing and the first thing that the broker would be talking about.
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Old 11-26-2019, 05:26 PM   #15
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There's certainly more to the story. Ask.
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Gets difficult if the current owner was not at time of replacement. But you are on notice something happened

Recently a newish Beneteau ST sold here with new engines, and a Riv on my marina had both engines replaced after insurance total loss. Both were water entry related.
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Old 11-26-2019, 06:37 PM   #16
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There's certainly more to the story. Ask.

Greg
Of course, and how completely the question is answered will go far toward weighing your confidence in the seller. Every boat has a story - or lots of stories. Beyond a certain point, it matters more how a boat was maintained than how it was built. Those are the stories you want to hear, preferably right from the owner.
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Old 11-26-2019, 07:16 PM   #17
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8 year old Cummins with 200 hours. What do you think would happen it someone decided to bring it up to 80% power?
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Old 11-26-2019, 08:17 PM   #18
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Attachment 96915



8 year old Cummins with 200 hours. What do you think would happen it someone decided to bring it up to 80% power?
I assume nothing good- but help me out what are we looking at ? A clogged aftercooler? What would cause this?
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Old 11-28-2019, 05:15 AM   #19
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Quote:
Originally Posted by AKDoug View Post
Sounds like Nordic Tug, smaller boat with huge horsepower, owner wants to run it a low speed and it can be hard on the engine idling all of the time... I had a friend with a NT 32 and a Cummins, it endlessly gave him trouble because he wanted to idle around at 6 knots and the engine didn't like it.

I think he would have been much happier with 60-100 hp the way he wanted to operate his vessel.


Hi, my questions to cummins:

Hi,

I have a Cummins 5.9 qsb marine engine 2009 and it reaches max rmp 3065 which is perfect my Nordic Tug 37.

I have read a lot of conflicting opinions on the engine to run at low rmp a long time, because the machine may damage the carbon and etc. Some say it's ok to run this type engine at low rmp if the coolant remains in the correct slot.

The time i run my engine is most often 850-1300 rpm since the boat is most economical in this rmp area and temperature is ok. Cummins runs fine and does not smoke any, exhaust pipe mouth environment does not show any black carbon.

What is the manufacturer's view of low load low rmp almost always, whether it is ok or damaging the engine?

It would be great to have an expert answer, all the web instead of rumors.

xxxx


Cummins say:

Xxx
This is fine for our engines. It is not suggested to Idle (650-750rpm) for long periods. Generally speaking, you can idle for about 20 minutes or so at this range and be okay. If you plan to idle longer than 20 minutes or so it is suggested that you ramp up your RPM to about 800-1000. Working the engine under a light load/rpm is fine. This is not uncommon for some our engines (like Generators which normally work at 1800 RPM or less) and will not cause any undue harm.
Thank you for contacting Cummins.

Xxxxxx


Customer Care Representative
If we have misunderstood the information in your communication or you have additional questions please feel free to respond to our support staff by e-mailing support.engineparts@cummins.com or 1-866-CUMMINS (286-6467). If you are located outside of North America, you can reach us at 1-615-871-5500.

NBs
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Old 11-28-2019, 10:53 AM   #20
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16 year old with 500 hours ? I would be more concerned with "when" the engine was changed. Was it 15 years ago as a warranty thing or was it last year ? Lots of times boats can sit for years then a new owner, or son, or daughter ends up with it and runs the hell out of it for a year or more so you can't assume that for the past 16 years the boat was used 30 hours a year.

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