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Old 06-10-2019, 02:23 PM   #41
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120 hp

I would keep the 120 hp and rebuild. I had a smaller Lehman in a 36' boat (displacement hull) for a number of years, and it was faster than the speed of "heat"!
Very odd that 3000 hrs you would have a problem.

Best of luck

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Old 06-10-2019, 02:49 PM   #42
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Seen some video's of older (and larger) diesel engines in inland waterway vessels in Europe. (Deutz, MAN, Brons, etc.) Many of these have a sequence of things to be done before starting and one of them is to pump the lub oil (which has been sitting at the bottom of the engine) throughout the engine with a manual pump. I would not know if one could do that with a Lehman, never heard of it, but hey, not too old to learn. Good luck and yes, my money would be on a rebuild, those Lehmans are amazingly reliable engines.
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Old 06-10-2019, 03:20 PM   #43
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Ahoy all. The engine is coming out on Wednesday. Wabi Sabi will be drydocked as we have the seized Lehman evaluated and most likely rebuilt.

More will be revealed then. I will keep you all posted.

Capt Harry
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Old 06-10-2019, 03:58 PM   #44
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Ahoy all. The engine is coming out on Wednesday. Wabi Sabi will be drydocked as we have the seized Lehman evaluated and most likely rebuilt.

More will be revealed then. I will keep you all posted.

Capt Harry
I hope it is nothing too expensive nor time consuming...
I think you will be happy reinstalling the original (rebuilt) engine. No surprises.
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Old 06-10-2019, 06:32 PM   #45
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Usually I use an iPhone and mostly keep it the same way. Some photos taken at the same time and orientation willupload differently. Don’t know, I am not a computer expert by any means.
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Old 06-11-2019, 03:05 AM   #46
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I would be willing to bet it is your dampner plate. Sounds just like a rod letting go or a dropped valve. If you have rust in bell housing even more proof.

The pieces fall between the block and flywheel.

Try turning crank backward, to see if it falls free.

Dampner plate is only good for 2500 hrs. Never heard of a Lehman failing catastrophically. Great engine.

Changed mine at 5000 hours, noise reduction was dramatic. Plate was completely shattered.
It is never a good idea to turn a motor backwards...
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Old 06-11-2019, 03:37 AM   #47
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Exhaust back wash

I am wondering how it seized. Were you driving along and it suddenly stopped or was it seized when you went to start it after it had been turn of for a few days.
I had the misfortune of buying my boat and the motors (120 Lehman's) ran fine but the time before that engine run, it got a guts full of sea water as a result of an unacceptable exhaust system, and when it was run for me it pumped that water through the engine. After I took possession one of the motors wouldn't start as it was seized and what actually stopped the motor from turning over was salt on the mains that was left there after the water evaporated from the engine heat. The motor was still tight until I took the last main bearing off. I probably could have used the original bearings as there was no engine damage or bearing damage but decided to replace anyway while the motor was down, the rings were okay as was everything else.
I must stress that it was impossible to turn the motor at all until all the big ends were off and half the mains and even then it was very very tight.
This info is redundant if you had and oil or heat related seizure
good luck
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Old 06-11-2019, 05:53 AM   #48
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It is never a good idea to turn a motor backwards...
A slight attempt to rock the engine to get the crank turn seems pretty common in the Lehman world.


Is there something in particular with this engine that a half rotation in the opposite direction will hurt?


I understand that on some engines it can be a problem depending how many rotations are done.
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Old 06-11-2019, 06:16 AM   #49
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A slight attempt to rock the engine to get the crank turn seems pretty common in the Lehman world.


Is there something in particular with this engine that a half rotation in the opposite direction will hurt?


I understand that on some engines it can be a problem depending how many rotations are done.

Where and how is it a problem? I've never heard of it being an issue either.
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Old 06-11-2019, 07:14 AM   #50
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Post #46 triggered my post.
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Old 06-11-2019, 07:21 AM   #51
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Post #46 triggered my post.
Many diesels will take a 1/4 to a 1/2 turn backwards on their own when shut down. At least the older ones.
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Old 06-11-2019, 07:36 AM   #52
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Many diesels will take a 1/4 to a 1/2 turn backwards on their own when shut down. At least the older ones.
I've seen a few degrees at shut down on my old Dodge truck Cummins, but never 1/4 turn (90 degrees).
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Old 06-11-2019, 08:14 AM   #53
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I've seen a few degrees at shut down on my old Dodge truck Cummins, but never 1/4 turn (90 degrees).
I never measured.
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Old 06-11-2019, 09:04 AM   #54
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Possibly I'm alone. I do not find it odd that a +40 year old diesel, of unknown previous maintenance and having sat for 6 years - failed. Yes, 3,000 hours seems low for a Lehman, but not necessarily a good singular measuring point.
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Old 06-11-2019, 09:15 AM   #55
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I wonder if an exhaust valve was partially hanging open and over the course of the run it slowly sucked water back into a cylinder and seized the engine. I have seen this on gas engines before. It's the main reason marine engines run cams with no overlap if the exhaust is water cooled.
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Old 06-11-2019, 09:21 AM   #56
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Is there something in particular with this engine that a half rotation in the opposite direction will hurt
The only way to bar a Lehman is a 1 1/4" nut holding the pulley on to the crank. Turning it backwards on a seized engine will simply unscrew the nut. But other than that issue, no problem in rotating backwards
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Old 06-18-2019, 03:07 PM   #57
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Look what I just brought home today.... Still not sure why engine seized. Pulled the dampener plate off when I got home and all is as it should be.

More will be revealed when I start taking this one apart. We decided on having a new rebuilt 120 going back in. What the heck, it's only money!
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Old 06-18-2019, 03:16 PM   #58
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Boatmon where will you be getting your newly rebuilt from and what are they charging for one if you don't mind. I have the same engine and have always been curious.
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Old 06-18-2019, 03:18 PM   #59
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That is what boats are for, to give you a place to use all your excess money...
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Old 06-18-2019, 03:21 PM   #60
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The Lehman's are pretty basic. Most all diesel rebuilders could do one. I've been quoted from $7K to $11K.
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