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Old 05-24-2017, 03:09 PM   #1
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Remotor grand banks 32

Hello,
I am considering to place a new engine in my wooden grand banks.
Now it is an old ford lehman 120 hp.
Considering a cummins 210 hp.
What would happen ? Much faster ?
Or will the boat break in two ?
The hull is in top shape.
Thanks.
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Old 05-24-2017, 03:22 PM   #2
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Why?? If you want to go fast get a different boat. You might get a knot or two better. If the Leyman is tired it can be rebuilt. I think it can be rebuilt in the boat-but I'm not sure. You won't have to do all the auxiliary items that you have to do to change engines. Big difference in cost. Plus, a good rebuild will probably outlast the boat.
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Old 05-24-2017, 03:50 PM   #3
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I totally agree with ddalme! The Lehman is perfect for that boat.. Rebuild it!
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Old 05-24-2017, 04:25 PM   #4
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The EU has some pretty strict emissions regs for remotoring. Would this preclude the drop in of a "new" engine vs rebuild of the old Lehman? Have you compared all in costs between rebuilding the old vs a Cummins 210? Would you do the replacement work yourself?
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Old 05-24-2017, 05:02 PM   #5
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GB offered the Cummins 210 in later models of the 32, so it will be a good choice. But even removing the Lehman and sending it out for a complete reubuild will be cheaper than a reconned Cummins considering mounts, exhaust, shaft, etc.

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Old 05-24-2017, 05:54 PM   #6
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Greetings,
Mr. C2. Welcome aboard. I fully agree with the above. Want a faster boat? Buy another one. Tired Lehman? Get it rebuilt. We have 2 Lehmans on board. I would rebuild both before I'd ever replace them.
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Old 05-24-2017, 06:02 PM   #7
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If you keep it, take it out and rebuild it, strongly suggest you look at putting it back on new softer engine mount while using an isolation coupler between your prop shaft and the transmission.

You will not believe the difference in makes in smoothing out vibration and vibration associated noises.
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Old 05-24-2017, 08:04 PM   #8
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I have 210 Cummins, but I'd say rebuild. The Ford Lehman is right for your application, and it would be much cheaper.
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Old 05-24-2017, 08:51 PM   #9
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Agree on rebuilding the Lehman. Great engines.
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Old 05-24-2017, 09:51 PM   #10
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Rebuild the old FL?
That's the cheapest route.

Sounds like the OP wants more speed. So getting a different boat is much better than work'in on the old FL. The OP should probably look at and take a ride on a Bayliner or equivalent. Maybe he wants a cruiser. If so he'd be numb to get a trawler cuze they are popular. Unless getting the in thing is #1.
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Old 05-24-2017, 10:19 PM   #11
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210 hp may add a knot or so. 210 hp will NOT get that boat planing reliably so if that is the thought it won't work.

ALthough I do not have a 32 G.B. my boat is very similar and the engine is 217hp. The only time it planed it planed very slowly, 11 K, and once our gear was aboard that was the last time it planed.

A new engine will likely require mounting changes, shaft change, gear change, prop change, exhaust change and a bunch of other smaller details I haven't even thought about . Whatever the engine costs you, the final cost will be almost double.

The Cummins is a fine engine, better than the Lehman, but be sure you need it before replacing. Those Lehmans were just the ticket for a huge number of boats like yours.

Get the Lehman rebuilt.
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Old 05-24-2017, 11:44 PM   #12
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Sadly...you are all telling him the one thing he didn't want to hear. Why..? 'Cause there's nowt so strange as folks...'specially ones that want to go faster..!
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Old 05-24-2017, 11:57 PM   #13
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Plan for the new engine and tranny and prop and shaft and cutlass bearing and associated cooling, exhaust and electrical system changes.

How much money do you want to spend on this 40+ year old woody?
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Old 05-25-2017, 12:45 AM   #14
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Last Easter we went for a cruse on a 35' timber Halvorsen that had been re powered by a Hyundai SeasAll .Wow what a smooth quite engine with little vibration from 900rpm to 1800rpm it was like the one big sweet spot. Id have no hesitation choosing a Hyundai SeasAll as a Cummins replacement
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Old 05-25-2017, 02:51 AM   #15
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I am totaly convnced not to change but to rebuild !
Thanks a lot.
Question : can they rebuilt without taking the engine out ?
Because the exaust etc is new.
It even has glendinning motorcontrol up and down.
The reason of changing engine is that the old one is using a liter oil in ten hours.
The head has been done last year...
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Old 05-25-2017, 03:23 AM   #16
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Quote:
Originally Posted by CIER2 View Post
I am totaly convnced not to change but to rebuild !
Thanks a lot.
Question : can they rebuilt without taking the engine out ?
Because the exaust etc is new.
It even has glendinning motorcontrol up and down.
The reason of changing engine is that the old one is using a liter oil in ten hours.
The head has been done last year...
A litre of oil in ten hours travel. Is that all..? I'd call that only a bit above average. That engine has a lot of life yet in my view, especially if the head has just been done. My trusty 120hp Lehman would probably burn that. I seldom do ten hours non-stop engine run-time, but I think I'd have to add about a litre after that. In an engine that holds a good 15 litres, plus, that's quite modest, I think. I think the man should just lie back and enjoy the ride, and save about $5000 to $10000 or more. What do others with Lehmans think..?
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Old 05-25-2017, 04:26 AM   #17
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Greetings,
Mr. C2. 1 liter/10hrs? Our engines used to use about that amount BUT, after having read a lot about Lehman oil use, I came to the conclusion that the dipstick was marked INCORRECTLY and I was adding too much oil to keep it topped up! When those engines were used in a perfectly horizontal orientation (as in a land based generator or power plant) the factory oil level mark is correct BUT when mounted at an angle (as in most if not ALL vessels), one has to adjust the oil level mark on the dipstick.

Try this: Completely drain all your oil (wait until your next oil change) and add EXACTLY the amount of oil as required by the manual and then either note where the oil is on the dipstick OR re-mark the dipstick to reflect the proper level. I suspect you will find your oil consumption goes down. Even if it doesn't, oil is cheaper than a re-build.
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Old 05-25-2017, 04:56 AM   #18
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Thanks mr Firefly !
Indeed, after 6 more hours the level on the stick did not get lower !
Just checked after your post.
So no rebuild and no new engine.
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Old 05-25-2017, 05:06 AM   #19
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Greetings,
Mr. C2. You're entirely welcome sir but it was NOT my idea. Simply another useful tip provided to me by the knowledge base here on TF.
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Old 05-25-2017, 06:02 AM   #20
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No smoke and 1 litre of oil in ten hours congratulations you have a near new motor
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