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Old 07-29-2018, 07:31 AM   #1
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Repowering our 30 ft Sundowner

Our 34 year old Pathfinder engine died yesterday. We are beginning the process of figuring out what engine to replace it with. The one we have is a 70 hp. We would like to go to a 90 or 100 hp. Any suggestions? Yanmar, Kabota, Cumming....? Any idea of the price? Appreciate any suggestions.
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Old 07-29-2018, 07:40 AM   #2
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I don't think you can get a Cummins in that small of HP. My vote would be Kabota.
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Old 07-29-2018, 07:47 AM   #3
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I have heard good things about Kabota, what do you think of Perkins or Lehman?
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Old 07-29-2018, 07:51 AM   #4
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Might want to consider Beta Marine. Believe they use the Kabota block and have 85 and 100hp units.
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Old 07-29-2018, 08:36 AM   #5
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Thanks for the Beta marine suggestion. How does Yanmar compare to Kabota? The reality of what just happened is just now sinking in! We were meant to be cruising in the Gulf of Mexico around the barrier islands this werkend, instead I'm in my living room trying to decide on how to spend thousands of $$$! Aaah, the joy of boat ownership!
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Old 07-29-2018, 08:58 AM   #6
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Eris,
If you cruise above 7 knots frequently you may want to look at the Yanmars. They are lighter and if you keep your boat light too more speed should be in the bag. A light engine w a turbo should provide.
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Old 07-29-2018, 09:10 AM   #7
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I think that the 75-100 hp Betas arebased on the Isuzu block, but still a fine engine and Beta is a quality marinizer.

The 100 hp Yanmar is a smaller block and uses an after cooler which means more maintenance.

So my vote is for the Beta. But also look at the John Deeres.

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Old 07-29-2018, 09:39 AM   #8
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Go to the engines section of boat diesel. Research each and every engine in the size range you’re considering. I’m not aware of any other on line source that compares with this data source. There are more choices than you can imagine, with your nearby dealer support playing an obvious role.

Dimensions, weight, drawings, specs etc are all available. Don’t forget gears are part of the equation. Take your time. This gives you the opportunity to clean up the ER and redo the hidden things that will appear once you’ve begun.
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Old 07-29-2018, 09:49 AM   #9
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Old 07-29-2018, 09:58 AM   #10
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If you’re doing a new engine, Beta. If used, there are plenty of JH series Yanmars out there. For ultimate simplicity, Kabota 85. I’m also a Deere fan, but they tend to be tall and heavy.
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Old 07-29-2018, 10:38 AM   #11
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Many moons ago, Tad Roberts (naval architect who frequents this site) recommended Beta Marine if we ever wanted to repower our 30' Sundowner Tug.

The PO of our boat put in a 100hp Yanmar 4JH2-UTE and I believe it's too big. We usually run it at 2700rpm which is not much past half throttle, and the turbo doesn't really wind up till just below 1/2 throttle. This gives us 7 to eight knots depending on currents, etc, and uses about 1.3 gph. Adding throttle past that point does add speed but the arse end squats badly, the bow starts plowing a huge wake, and I imagine fuel consumption would increase quickly. It is maybe two/three inches from the forward bulkhead in the engine room.

If we ever repower it would probably be the Beta Marine naturally aspirated 75hp or the 85hp turbo...would have to research a bit.

I'm a letter carrier and can recognize the sweet, smooth running sound of a Kubota diesel engine in a backhoe doing work in someones yard from a street away
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Old 07-29-2018, 11:16 AM   #12
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Mate,

I would have a look at Caterpillar's C-7s or C-7.1s.

Best of luck.

Cheers.

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Old 07-29-2018, 01:50 PM   #13
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Mate,

I would have a look at Caterpillar's C-7s or C-7.1s.

Best of luck.

Cheers.

H.
400hp might be a bit much considering it is a full displacement hull with a 30’ lwl and was built with 70hp.... 7 liters is a bit of overkill.
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Old 07-29-2018, 07:12 PM   #14
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I would look at Beta Marine / Kabota as well . Great little engine and good support from Beta Marine.
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Old 07-29-2018, 08:02 PM   #15
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Beta is great ...
But pricy and getting parts may still be problematic.
I have a back hoe engine too and it’s been great for about 12yrs.
Far less money than ... you name it ... but no bright colored paint job.
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Old 07-29-2018, 08:10 PM   #16
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Quote:
Originally Posted by Eris Turner View Post
Our 34 year old Pathfinder engine died yesterday. We are beginning the process of figuring out what engine to replace it with. The one we have is a 70 hp. We would like to go to a 90 or 100 hp. Any suggestions? Yanmar, Kabota, Cumming....? Any idea of the price? Appreciate any suggestions.
Hello Eris,

Thought over considering a "Running Take Out" or other reason for being on the market? Asked as when faced with the cost of a new replacement engine in a boat that is valued say, around $25-30 Thousand, our attitude changed and we made a serious charge to locate a replacement engine. We were successful in obtaining a Perkins 4-236 to replace our Perkins 4-154, a 85 hp upgrade from the 58 hp that was. We acquired ours off Craigslist but there are so many other outlets that one has to ask. I'd ask around the waterfront mechanical shops or even dealers who have made engine change outs knowing of a good 'running take out". This while you price and determine a new engine if that is the determination.

I agree, you had better have dealer coverage for what ever new engine you purchase. By the way, who is going to do the change out? DIY? asked again as installers other than dealers, would perhaps have knowledge of existing used engines.

To for stall the naysayers on used engines, we all are not so wealthy as to buy off the shelf, yet we to enjoy boating, this post is offered as a alternative, not the final solution. Thank you.

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Old 07-29-2018, 08:12 PM   #17
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The EPA has caused marine engines to be turboed, often resulting in overpowering boats. I'm nearly the last USA recipient (2010) of a naturally-aspirated diesel at 80 hp. No?
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Old 07-29-2018, 08:39 PM   #18
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Mark NO that does not caues overpowering.
Even easier to put in a smaller turbo’d engine.
They need to get the hp right.
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Old 07-29-2018, 08:47 PM   #19
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Murray wrote;
“If we ever repower it would probably be the Beta Marine naturally aspirated 75hp or the 85hp turbo...would have to research a bit.”

Turbo w/o the aftercooler would be OK but 65hp would probably make you just as happy. You seem to have a JH series Yanmar and the basic JH is a natural 55hp. That would probably work very well too.

You could find a take out as Al was talk’in about.
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Old 07-29-2018, 09:01 PM   #20
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Rocky

My 30 Sundowner was repowered from the 54 hp VW to a 80 hp Cat 3034T (Perkins M85T) 2,400 hours ago. It runs easily at 7kt at 2,000 rpms, burning 1.6 gph. It will go up to 2,600 rpms and 8.1 kt but the fuel burn is probably 3X and the bow tries to climb out of the water. You will see posts claiming “cruises at 8-10 kts” in ads but it is a lie. Set your sights on the 80-85 hp range and be happy. Anything bigger is a waste of time, money and space.

Rocky Champagne, “Agnes Jean”, 1982, 30 Sundowner, hull #3
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