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Old 10-10-2016, 07:17 PM   #21
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6CT 300 Cummins are a good choice, have one in my charter boat.
Would also recommend John Deere 6068 series. Lots of HPs to choose from.

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Old 10-10-2016, 07:39 PM   #22
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X 17. Wow, seriously ski. My hat is off...good advice.
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Old 10-10-2016, 07:43 PM   #23
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...Thanks all your suggestions.. I start my list..
I found this article about "continuous duty"
Very interesting...
Continuous Duty - A Different Perspective - Seaboard Marine
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Old 10-10-2016, 09:27 PM   #24
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stick with the 671 you can by parts in a corner drug store LOL
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Old 10-11-2016, 12:05 AM   #25
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Actual engine is 170 hp and give more or less 8 knots at full power. Hull speed is 9.7 so I would install something a little more power (close to 200 hp).... I think 260 hp it's the absolute minimum for this boat (46' x 15', around 20 tons displacement).
Garrobito, the numbers you've given above don't jibe. But instead of trying to calculate power, just do like ski mentioned and measure your power at various speeds. From that you can extrapolate how much is needed for V/L 1.34, if you really think it's necessary to reach that speed.

BTW, you are exempt from having to install a T-3 engine as long as you trade-in to the dealer (don't sell the DD engine on your own unless you can prove transfer - check this with the dealer first). A good ole mechanical T-1 will get almost 10% better fuel economy. And absolutely stay away from glow plug engines. That Yanmar is the wrong solution.
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Old 10-11-2016, 12:21 AM   #26
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Well I think it is time you looked at a Gardner 6LXB. 10 lts ,150 HP at 1500 RPM and 12 lts per hour
My boat at L 48'6" 15'6" beam draft 5'8" and 28 tonnes cruises at 8 knots and 1250 RPM.
No electronics to worry about , decompression levers and jack up individual cylinders on the fuel pump.
The perfect cruising engine.
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Old 10-11-2016, 01:41 AM   #27
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Benn, are Gardner engines still made, and parts available? They seem an older design, so I wondered. Good if they are, with such a good reputation.
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Old 10-11-2016, 01:52 AM   #28
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6LX/LXB GARDNER DIESEL ENGINES & PARTS | Boat Accessories & Parts | Gumtree Australia Tweed Heads Area - Tweed Heads | 1066396244
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Old 10-11-2016, 02:46 AM   #29
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I have an LW Gardner sitting in my shop waiting for someone who wants it rebuilt. Parts are not that hard to come by just far away. For Florence I have decided to remove the 671 and I am building an 855 Cummins. I looked at 3406 but two things held me back. I think you pay a fuel penalty for a cat over the same horsepower in Cummins and the inline injection pump, while long lived, is very expensive to overhaul. Typically in the 4500 dollar range if it is badly damaged. The Cummins pump is about 500 to 600 dollars to overhaul. I can carry a full range of spare parts for an 855 for less than the cost of a spare pump for the 3406. The 855 will be very lightly stressed in this job so should be fairly happy. I am building it as a 300 HP continuous and expect to use about 150 of that.
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Old 10-11-2016, 03:44 AM   #30
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Gardner engines are not built any more , but they are rebuilt all over the world. The blocks are every where as they were used in boats, buses and trucks from the UK to the Nile and Hong Kong.
People will still put them in new builds due to their long life , slow reving and fuel economy and simple to operate.
There are at least 3 specialist rebuilders in Aus and 1 in NZ that I know of.
Parts around the world are as common as GM parts in the US.
They are not everyones cup of tea but they are very robust and economical.
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Old 10-11-2016, 03:55 AM   #31
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W O W

Gardner Marine Diesel Engines for sale and new products releases - Express Diesel Service Ltd



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Old 10-11-2016, 05:51 AM   #32
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I you are considering a rebuilt Gardner then perhaps consider a brand new doosan. Same "class" of engine. If there is no limit to your budget, then a dream engine would be a guascor
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Old 10-11-2016, 09:17 AM   #33
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The way all this money is being slung around, w/o one hell of a deal that 671 looks better by the minute. $20k. Likely difference of repair of 671 vs quality 4stroke replacement will buy a lot of diesel. 671 burns this much - new 4stroke burn= ? $20? even $5k would be hard to justify.
The 4 stroke will be quiter though.
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Old 10-11-2016, 11:51 AM   #34
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I second the 6CTA. My boat is 52' and 23 tons, I run my M1 engine (250 hp) at 1400 rpm and she does 7.5 knots. My fuel burn is 12 to 15 litres per hour using my Onan genset (7.5). You can get this engine in any config. up to about 485 hp.
Mine is dry stacked and keel cooled.
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Old 10-11-2016, 01:22 PM   #35
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I would consider the availability of support along your intended cruising route for whatever engine you choose as a big factor in your choice.
Hopefully, the engine will run like a top and never skip a beat for years to come, but IF old Murphy shows up along the way, you will want parts and service in a timely manner.
In my years of dealing with trucks, boats, and heavy equipment, I think Cummins is the most proliferous brand out there, so parts and service will be the most readily available.
The 6B or C at moderate hp ratings are about the most bulletproof motors for the buck you will find.
As mentioned above, your most intelligent choice might made by running the boat for a while with the old DD to gather info/insight/data.
The 9.7 knots may be an unrealistic target for your cruise speed, unless the hull in question is very sleek indeed!
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Old 10-11-2016, 01:27 PM   #36
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If dependability and parts availability are priorities the 6-71 at 170 hp should work just fine, parts and mechanics who can diagnose and repair are pretty easy to find almost anywhere. I would recommend that you use the boat for a years or so before making a decision on re-powering.
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Old 10-11-2016, 03:12 PM   #37
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..more information to add... seaboard marine specialist recommendation is a Cummins recon 6CTA, 8,3 litters "all mechanic" rated at 320 hp at transmission.. no price but I suspect could be around 40k??
Gardner.. I used to have one in another commercial boat.. sturdy, reliable.. but in that case, my detroit looks much better with an overhaul...
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Old 10-11-2016, 03:20 PM   #38
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Quote:
Originally Posted by makobuilders View Post
Garrobito, the numbers you've given above don't jibe. But instead of trying to calculate power, just do like ski mentioned and measure your power at various speeds. From that you can extrapolate how much is needed for V/L 1.34, if you really think it's necessary to reach that speed.

BTW, you are exempt from having to install a T-3 engine as long as you trade-in to the dealer (don't sell the DD engine on your own unless you can prove transfer - check this with the dealer first). A good ole mechanical T-1 will get almost 10% better fuel economy. And absolutely stay away from glow plug engines. That Yanmar is the wrong solution.

This is a great suggestion! I was ready to sell this old detroit... definitely I gonna explore a trade in first.. thanks you!!
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Old 10-11-2016, 03:29 PM   #39
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Originally Posted by River Cruiser View Post
If dependability and parts availability are priorities the 6-71 at 170 hp should work just fine, parts and mechanics who can diagnose and repair are pretty easy to find almost anywhere. I would recommend that you use the boat for a years or so before making a decision on re-powering.

..Problem I want to go north with that trawler... I don't know if I can trust an old engine while I'm 70/100 miles off coast with my family... re powering is gonna add a safety key to our trip...
Second point is Detroit is awful expensive on diesel.. new engine is gonna give me at least 10% less consumption (depend conditions off course )
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Old 10-11-2016, 05:34 PM   #40
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Originally Posted by garrobito View Post
..Problem I want to go north with that trawler... I don't know if I can trust an old engine while I'm 70/100 miles off coast with my family... re powering is gonna add a safety key to our trip...
Second point is Detroit is awful expensive on diesel.. new engine is gonna give me at least 10% less consumption (depend conditions off course )
So you are going to spend $40K to save 10% on fuel consumption??? This doesn't pass the smell test. Just overhaul the engine you got and you will be a happy camper.
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