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Old 01-24-2017, 06:46 PM   #1
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Which new engine to replace Ford Lehman 120?

A friend of mine has a twin engine 42ft trawler. Both Ford Lehman 120hp engines need an overhaul. The prices quoted to remove, overhaul, and reinstall are running $30k to $50k.

Has anyone replaced the FL 120 with a new different engine?

What engines are suitable? I have heard that John Deer and Yanmar engines are possibilities.

Thanks for any help.
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Old 01-24-2017, 07:41 PM   #2
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I'd take a look at reman Cummins 6BTs.
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Old 01-24-2017, 07:41 PM   #3
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Look into Mercedes. That's what I have. Extremely quiet.
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Old 01-24-2017, 07:44 PM   #4
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Too much money. Call Industrial Engines in Delta, BC. They rebuild and sell rebuilt Lehmans. That way it's a straight swap, same transmissions etc.

What is wrong with the "old" ones? Having two go to the wall at the same time is unusual. I'll bet it's something simple...

Plus you get a good deal with our crap Loonie.
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Old 01-24-2017, 08:03 PM   #5
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Rebuilding seems the way to go...


LarryM just had a thread on here where he rebuilt with costs associated...search or PM him.....but $30K sounds about right and way less than replacements.
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Old 01-24-2017, 08:48 PM   #6
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Not sure Yanmars would be my choice for a trawler, Deere would be much more than the quoted replacement /rebuild cost of existing motors....
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Old 01-24-2017, 08:53 PM   #7
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Repowering is great in that one gets the option of changing your power. Many boats are overpowered and when you repower you are in the drivers seat and can get whatever engine you want. Many boats have power assigned by salesmen and other marketing sources. Not what the NA had in mind at all.

When I repowered I enjoyed the shopping and research. I have a boat that is and was propperly powered but I considered everything as I went along. Engine mounts can be a problem and frequently having the exhaust on the same side helps.

As for the FL MER (in Seattle) has/had as close to a drop in replacement as I have seen. It was a 135hp John Deer. But that's a same power engine. So first you need to consider if the original power is appropriate or if a change would be better. The GB 36 could be repowered w a pair of 55 to 85hp engines or a pair of lighter engines that make more power. Consider resale value if you change the amount of power. Look at the Vetus offerings. Look at everything you can find. Have your range of acceptable dimensions to compare to possible engine and gearboxs. All the while trying to fit possible installers to all the locations and providers. Used equipment is also a posibility but if you can go w new.
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Old 01-24-2017, 08:54 PM   #8
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Plenty of suitable engines, but consider the cost of changeover. Different mounts and locations, new wiring, new instruments, gearbox changes, cooling system fresh and raw water changes, and so on. Much more economic to rebuild or exchange Lehman to Lehman, and you know beforehand it`s a good economic engine.
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Old 01-24-2017, 09:27 PM   #9
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The path of least resistance would be to rebuild the Lehmans as long as you can still get all of the needed parts. Call Brian Smith to see if he would recommend a rebuilder in your area.
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Old 01-24-2017, 09:45 PM   #10
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Not sure Yanmars would be my choice for a trawler, Deere would be much more than the quoted replacement /rebuild cost of existing motors....
I had a small trawler w a small Yanmar. Was perfect.

The high output per engine displacement would make a Yanmar inperfect I admit. However with that aside I see no reason not to choose a Yanmar in a reasonable output level .. or any similar engine.
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Old 01-24-2017, 11:10 PM   #11
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Old 01-24-2017, 11:51 PM   #12
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A strong consideration on repowering should be parts and service availability in your area and along routes you plan to cruise.
That said, I would buy Cummins 6bt motors and derate them at the throttle stop to the desired output.
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Old 01-24-2017, 11:56 PM   #13
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I'd rebuild, too. Too many add-on costs and surprise costs associated with a twin re-engine.
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Old 01-25-2017, 02:16 AM   #14
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I'd rebuild, too. Too many add-on costs and surprise costs associated with a twin re-engine.
Redoing the exhaust systems too. Forgot that one, and probably several more messy alterations.
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Old 01-25-2017, 02:27 AM   #15
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I would definitely rebuild. However if you really want Lehman does have an exact replacement new engine that fits precisely and matches to the transmission. I think you get another 10 or 15 hp. Call Brian for sure.
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Old 01-25-2017, 06:33 AM   #16
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Quote:
Originally Posted by Larry H View Post
A friend of mine has a twin engine 42ft trawler. Both Ford Lehman 120hp engines need an overhaul. The prices quoted to remove, overhaul, and reinstall are running $30k to $50k.

Has anyone replaced the FL 120 with a new different engine?

What engines are suitable? I have heard that John Deer and Yanmar engines are possibilities.

Thanks for any help.
Lehmans can be overhauled in place, down to the block - even the main bearings and crankshafts. Has he looked into that option..?
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Old 01-25-2017, 08:11 AM   #17
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Quote:
Originally Posted by Larry H View Post
A friend of mine has a twin engine 42ft trawler. Both Ford Lehman 120hp engines need an overhaul. The prices quoted to remove, overhaul, and reinstall are running $30k to $50k.

Has anyone replaced the FL 120 with a new different engine?

What engines are suitable? I have heard that John Deer and Yanmar engines are possibilities.

Thanks for any help.
If I'm reading this right, $30K isn't horrible for 2 engine rebuilds depending on what's involved. If he's not doing the work himself, new repower of twins could easily $80K to $120K.

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Old 01-25-2017, 08:12 AM   #18
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Another Lehman rebuilder to contact is Tacoma Diesel. A few years ago at the Seattle boat show a booth had a totally rebuilt Lehman. I can't recall the Seattle area rebuilder - they offered a good warranty. Look around you'll find a good rebuilder if that is the route you choose. Have you talked to North Harbor Diesel in Anacortes?
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Old 01-25-2017, 09:06 AM   #19
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Here is the case for repower with a remanned Cummins 6BT:

Pros:
1. Brand new engine with full factory warranty
2. Resale value- same engine as was in later GB 42s
3. No downtime waiting for rebuild
4. Same exhaust side as Lehman-- minimal modification to exhaust

Cons:
1. Probably requires new transmission for torque and ratio change- VD 72
2. Requires new engine mount brackets
3. Requires installing new helm instruments

The cost of a pair of 6BTs is about $45K, two new transmissions is $6000. Installation labor is $10-20K. So worst case $70K vs $50K for overhauling or replacing the Lehmans.

I would gladly pay the $20K premium to get brand new engines and transmissions that are based on 25 year newer technology.

David
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Old 01-25-2017, 09:38 AM   #20
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Consider resale value if you change the amount of power.
This is what concerns me. The typical 40ft. or so trawler requires less than 100 hp to drive it along at hull speed all day long. So a pair of 85-90hp motors would be great, providing plenty of power for normal motoring, and adequate get-home power if one engine dies.

But most trawlers come with several times that much power. I've seen boats clearly designed for mostly hull-speed operations that have 5-6 times as much power as they need. Are there really that many boaters out there who are willing to see their GPH triple in exchange for going 40% faster!?! I guess there must be.

And if I repower to a more reasonable hp level, am I going to kill the resale value? Will everyone who considers my boat say to themselves (doing their best Tim The Tool-Man imitation), "Arr, arr, arr! Need more power!"?
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