Need advice on repowering a 37ft Webbers Cover

Capt Jax

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Howdy from Florida -

I find myself needing to replace my original 1970 Ford Lehman 120HP Diesel with Velvet Drive transmission for my 1970 37 ft Webbers Cove (40ft with the 3 ft swim platform previous owner added). Long sad story, but it finally gave up the ghost and she is now dead in the water. I am a beginning my search now and seeking wisdom. This is my first venture into the "gotta now shop for a new engine" after owning this boat for 10 years.

Should I stick with the same HP (120-ish) or should I take advantage of a newer (re-man'd) engine with more HP and probably smaller footprint? I would hope that I can get some more speed out of her with more HP but am I misguided by the limits of hull speed? I have seen other posts with captains claiming 20+ kts with 300-500 HP on their DEs. With the old Ford Lehman on a good day at 75% throttle going downhill I could get it up to around 9-10 kts. With a newer, more powerful could I expect faster speed?

Any recommendations for an affordable and reliable engine to replace? My local marina and mechanic swears by Cummins and another prefers CATs. I am not too far from Ft. Lauderdale where it seems to have a plethora of Marine Engine warehouses full of rebuilt or remanufactured engines of all kinds and sizes. I am looking to buy used due to budget constraints.

Any advice on how to begin my search and ultimately purchase would be greatly appreciated. Basically, I don't know what I don't know! Help!

-Capt Jax
 

Genius

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If you want it on the cheap cheap, I'd look for another running 120hp Lehman. I've used them before and I agree, a great engine. If you are looking for more power, remember there are other things associated with this; fuel system/exhaust/shaft/prop/mounts and glass work/air vents/gear ratio and type. Upgrade option suggestions would be cummins 210-315? Or Yanmar 6LP or 6LY. JD 6068 is also a great engine though I don't have much experience with them.

What's wrong with your Lehman? How many hours? I've seen these engines go over 20k hours.
 

TAftw

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The lower horsepower Cummins 6BTA’s come up for sale a lot. Even just one of the 210 hp ones would be better than what you’ve got now
 

southshore30

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I know a guy with one of those boats and he repowered a few years back with a 3126 Cat I believe. I think he’s around 300 hp and he still doesn’t get anything over 16 knots. Not sure the hull speed allows it
 

djmarchand

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Is this a recreational boat with all of the weight inside that intails? If so if you want to go fairly fast, say cruise at 16-18 kts I think you need at least an 8 liter engine of 400+ hp. With that engine running at that speed will require maybe 300 hp continuous output. The Cummins C whether the mechanical 6CTA or the new QSC will do that.

If you can live with cruising at 15 kts or less then the Cummins B engines will work ok.

Somewhere in between a newish Cummins QSB 6.7 will probably work.

All of the above except perhaps for the newish Cummins are available as factory remans. That is what I would do, probably a Cummins 6CTA 450.

David
 

winterking

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Is this a recreational boat with all of the weight inside that intails? If so if you want to go fairly fast, say cruise at 16-18 kts I think you need at least an 8 liter engine of 400+ hp. With that engine running at that speed will require maybe 300 hp continuous output. The Cummins C whether the mechanical 6CTA or the new QSC will do that.


If you can live with cruising at 15 kts or less then the Cummins B engines will work ok.

Somewhere in between a newish Cummins QSB 6.7 will probably work.

All of the above except perhaps for the newish Cummins are available as factory remans. That is what I would do, probably a Cummins 6CTA 450.

David, just curious as to why you specify 8 liter engine? Just the extra beef to the motor? My dream is to repower my Bhm with a remanufactured 6cta. Is their an advantage over the other selections you mention?
Thanks! Tom

David
 

winterking

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I somehow lost my post....
David,
I Meant to ask why do you recommend the 8 liter engine, is their an advantage over the others you mentioned?
Thanks! Tom
 

Bill

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Jax I would opt to find another Lehman and just replace what’s there. You will prob have to change out the gear / shaft / prop / shaft seals etc if you go bigger and opens up a can to go how much faster and how much more is it worth resale with engine 1 vs 2? ...I would find one that will bolt back up and get the boat running again ..
 
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Genius

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Why is the engine toast? They are hard to kill.

I wouldn't want a lifeboat engine. They are run like shit and maintained like shit. Low hours yes, but that's not what sells me on an engine.

Seriously... A running Lehman engine can be found very very easily. For cheap money. Installation would be extremely easy compared to another engine. You would also have your old engine as a parts donor.
 

Capt Jax

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Thank you all for the input. All very good points to consider. This is quite an adventure but also a good opportunity to Make A Lobster Boat Great Again (MALBA)!! I shall report back with details as I progress with this repower and pictures!!

Capt Jax
 
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