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06-10-2019, 02:23 PM
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#41
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Veteran Member
City: st john's , nl
Join Date: Sep 2013
Posts: 43
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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
J
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06-10-2019, 02:49 PM
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#42
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Veteran Member
City: Seattle
Join Date: Jul 2017
Posts: 30
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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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06-10-2019, 03:20 PM
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#43
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Member
Join Date: Jun 2010
Posts: 22
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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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06-10-2019, 03:58 PM
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#44
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Guru
City: Aventura FL
Vessel Name: Kinja
Vessel Model: American Tug 34 #116 2008
Join Date: Oct 2017
Posts: 10,595
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Quote:
Originally Posted by boatmon
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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I hope it is nothing too expensive nor time consuming...
I think you will be happy reinstalling the original (rebuilt) engine. No surprises.
__________________
Two days out the hospital after a week in the hospital because of a significant heart attack.
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06-10-2019, 06:32 PM
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#45
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Moderator Emeritus
City: Au Gres, MI
Vessel Name: Black Dog
Vessel Model: Formula 41PC
Join Date: Jul 2015
Posts: 21,185
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Quote:
Originally Posted by Nomad Willy
Como,
Are you guys taking pics w i-pads ect?
Been my experience that you must take the pic w the pad (or ?) oriented correctly. Need to take some test pics and take notes how the pad/camera was oriented. Then if you always hold the pad that same way all the pics on TF will be right side up. Or should I say right end up. The saying right side up is not right. Confusing anyway .... You don’t want the side up you want the top or bottom up. But there’s no word for that that includes both .. ???
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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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06-11-2019, 03:05 AM
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#46
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Senior Member
City: Aposentillo
Join Date: Jul 2018
Posts: 172
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Quote:
Originally Posted by Choices
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.
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It is never a good idea to turn a motor backwards...
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06-11-2019, 03:37 AM
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#47
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Veteran Member
City: Clare
Vessel Name: ARGO
Vessel Model: Bristol 42
Join Date: Oct 2014
Posts: 28
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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
__________________
Steve Marcus
Port Broughton
South Australia
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06-11-2019, 05:53 AM
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#48
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Guru
City: Ft Pierce
Vessel Name: Sold
Vessel Model: Was an Albin/PSN 40
Join Date: Oct 2011
Posts: 28,148
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Quote:
Originally Posted by Juggerknot
It is never a good idea to turn a motor backwards...
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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.
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06-11-2019, 06:16 AM
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#49
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Guru
City: Vermont
Join Date: Jan 2013
Posts: 10,092
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Quote:
Originally Posted by psneeld
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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Where and how is it a problem? I've never heard of it being an issue either.
__________________
MVTanglewood.com
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06-11-2019, 07:14 AM
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#50
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Guru
City: Ft Pierce
Vessel Name: Sold
Vessel Model: Was an Albin/PSN 40
Join Date: Oct 2011
Posts: 28,148
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Post #46 triggered my post.
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06-11-2019, 07:21 AM
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#51
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Guru
City: Narragansett Bay
Vessel Model: Grand Banks 36 Classic #715
Join Date: Sep 2016
Posts: 1,857
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Quote:
Originally Posted by psneeld
Post #46 triggered my post.
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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.
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06-11-2019, 07:36 AM
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#52
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Guru
Join Date: Jun 2008
Posts: 5,037
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Quote:
Originally Posted by Cigatoo
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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I've seen a few degrees at shut down on my old Dodge truck Cummins, but never 1/4 turn (90 degrees).
__________________
Jay Leonard
Ex boats: 1983 40 Albin trunk cabin, 1978 Mainship 34 Model 1
New Port Richey, Fl
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06-11-2019, 08:14 AM
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#53
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Guru
City: Narragansett Bay
Vessel Model: Grand Banks 36 Classic #715
Join Date: Sep 2016
Posts: 1,857
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Quote:
Originally Posted by jleonard
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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I never measured.
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06-11-2019, 09:04 AM
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#54
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Guru
City: Carefree, Arizona
Vessel Name: sunchaser V
Vessel Model: DeFever 48 (sold)
Join Date: Apr 2008
Posts: 10,186
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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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06-11-2019, 09:15 AM
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#55
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Guru
City: Upstate,SC
Vessel Name: Shipoopi
Vessel Model: derilic sailboat
Join Date: May 2012
Posts: 2,884
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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.
__________________
This is my signature line. There are many like it but this one is mine.
What a pain in the transom.
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06-11-2019, 09:21 AM
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#56
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Guru
City: Boston
Vessel Name: Adelante
Vessel Model: IG 30
Join Date: Nov 2016
Posts: 1,609
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Quote:
Originally Posted by psneeld
Is there something in particular with this engine that a half rotation in the opposite direction will hurt
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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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06-18-2019, 03:07 PM
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#57
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Member
Join Date: Jun 2010
Posts: 22
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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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06-18-2019, 03:16 PM
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#58
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Senior Member
City: Va Beach
Vessel Name: SeaShell
Vessel Model: 1974 Marine Trader 34 Sedan
Join Date: Aug 2018
Posts: 169
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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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06-18-2019, 03:18 PM
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#59
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Moderator Emeritus
City: Au Gres, MI
Vessel Name: Black Dog
Vessel Model: Formula 41PC
Join Date: Jul 2015
Posts: 21,185
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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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06-18-2019, 03:21 PM
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#60
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Member
Join Date: Jun 2010
Posts: 22
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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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