Reply
 
Thread Tools Search this Thread Display Modes
 
Old 02-09-2017, 12:37 PM   #1
Member
 
City: Savannah
Country: United States
Join Date: Feb 2017
Posts: 6
Lehman 80 - soot problem

Keep finding black soot on the transom after a run.
Engine runs fine with no overheating, no fuel in the oil or coolant. Prop is correctly sized, but do not usually run over 1800 rpm.

Ideas welcome.
__________________
Advertisement

Bejasus is offline   Reply With Quote
Old 02-09-2017, 01:49 PM   #2
Enigma
 
RT Firefly's Avatar
 
City: Slicker?
Country: Bumpkin?
Join Date: Oct 2007
Posts: 12,759
Greetings,
Welcome aboard. Bejasus? Irish?
__________________

__________________
RTF
RT Firefly is offline   Reply With Quote
Old 02-09-2017, 04:51 PM   #3
Guru
 
City: Full Time Cruising East Coast
Country: USA
Vessel Name: Meridian
Vessel Model: Krogen-42
Join Date: Aug 2011
Posts: 988
I used seafoam and it cleaned the injectors and no more soot
__________________
-------------------------
Terry
Meridian
KK-42097
meridian is offline   Reply With Quote
Old 02-09-2017, 08:51 PM   #4
Member
 
City: Savannah
Country: United States
Join Date: Feb 2017
Posts: 6
Scots actually but I can see why you would think Irish. It is the name of the boat but actually an anagram of our kids names. BEn,JAde,SUmmer,Sasha. It seemed an appropriate name.
Bejasus is offline   Reply With Quote
Old 02-09-2017, 09:04 PM   #5
Guru
 
City: Sydney
Country: Australia
Join Date: Jul 2015
Posts: 1,646
Leamens /Perkins I have a Perkins 6 that has about the same finesse engineering standards as a Leamen . Both share 50 yo technology they both smoke learn to love it
gaston is offline   Reply With Quote
Old 02-09-2017, 09:08 PM   #6
Enigma
 
RT Firefly's Avatar
 
City: Slicker?
Country: Bumpkin?
Join Date: Oct 2007
Posts: 12,759
Greetings,
Mr. B. Sorry. No insult intended. I have an Irish friend and that's one of his more common expletives. As in..."She came around da corner and scared the bejasus out of me"...Again, apologies...
__________________
RTF
RT Firefly is offline   Reply With Quote
Old 02-09-2017, 10:18 PM   #7
Member
 
City: Savannah
Country: United States
Join Date: Feb 2017
Posts: 6
No apologies required. We found it an apt name since the boat frequently scared the bejasus out of us. ��
Bejasus is offline   Reply With Quote
Old 02-09-2017, 10:27 PM   #8
Guru
 
LaBomba's Avatar
 
City: Beaverton, Ontario
Country: Canada
Vessel Name: Looking Glass
Vessel Model: Carver 370 Voyager
Join Date: Nov 2012
Posts: 1,161
Welcome Bejasus, lots of old diesels smoke a bit and produce some transom soot. Mine does, but not excessively. It is really not a sign of any issues unless it is excessive, so just learn what takes it off without too much work and enjoy!
__________________
Allan
LaBomba is offline   Reply With Quote
Old 02-09-2017, 10:38 PM   #9
Guru
 
Tom.B's Avatar
 
City: Cary, NC
Country: USA
Vessel Name: Skinny Dippin'
Vessel Model: Navigator 4200 Classic
Join Date: Jul 2009
Posts: 5,703
I get it too. Even with two 6.3l Volvos only 17 years old. I haven't explored if there is a solution to it just yet. I hope an oil change might do it, I thought new air and vent filters would do it, but TBH, I believe it is just the location of the exhaust outlets in our case. But hey, they run hard and true... and nothing a couple of magic erasers won't fix :-)
__________________
2000 Navigator 4200 Classic
(NOT a trawler)
Tom.B is offline   Reply With Quote
Old 02-09-2017, 11:17 PM   #10
Veteran Member
 
Busterbrown's Avatar
 
City: Corona
Country: USA
Vessel Name: SCRAMBLER
Vessel Model: 1974 Grand Banks 32 #536
Join Date: Jul 2013
Posts: 58
Have you ever had the injectors rebuilt?
Busterbrown is offline   Reply With Quote
Old 02-10-2017, 05:46 AM   #11
Member
 
City: Savannah
Country: United States
Join Date: Feb 2017
Posts: 6
Nope, but intend doing so soon.
Bejasus is offline   Reply With Quote
Old 02-10-2017, 08:28 AM   #12
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 19,751
Most times visible smoke or a dirty transom is simply caused by the time period in which the engine was built.

They used the best tech at the time , rebuilding an old problem free injector will not solve the problem.

For most cruisers age is a blessing , no need to super filter "clean " from the pump fuel as the new engines require , no need to check SCA in the antifreez.

Like a mustache on the bow , a sooty transom just shows you use the boat.

Scrub it before you sell it.
FF is offline   Reply With Quote
Old 02-10-2017, 11:26 AM   #13
Guru
 
Nomad Willy's Avatar
 
City: Concrete Washington State
Country: USA
Vessel Name: Willy
Vessel Model: Willard Nomad 30'
Join Date: Oct 2007
Posts: 16,093
FF,
Spot on but many a good thread has come about from over kill of some problem that may not be a problem at all. Over the years we've had probably hundreds of posts about swivels. Never heard of one breaking.
__________________
Eric

North Western Washington State USA
Nomad Willy is online now   Reply With Quote
Old 02-10-2017, 01:10 PM   #14
Member
 
City: Savannah
Country: United States
Join Date: Feb 2017
Posts: 6
Never had the soot problem prion to going to the Bahamas last year. A little blue smoke on start up was normal. The black soot is not, so we will see what an injector service will do.
Bejasus is offline   Reply With Quote
Old 02-10-2017, 01:19 PM   #15
Senior Member
 
Blissboat's Avatar
 
City: Jacksonville Beach, FL
Country: USA
Vessel Name: Shallow Minded
Vessel Model: Shoal Cat
Join Date: May 2015
Posts: 470
Is the air filter clean? If so, injectors would seem the next likeliest place to look. But as others have said, older diesels do tend to emit a bit of exhaust soot.
__________________
“Believe me, my young friend, there is nothing - absolutely nothing - half so much worth doing as simply messing about in boats.”
― Kenneth Grahame, The Wind in the Willows
Blissboat is offline   Reply With Quote
Old 02-10-2017, 02:25 PM   #16
Guru
 
Ski in NC's Avatar
 
City: Wilmington, NC
Country: USA
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 5,356
Look at tailpipe while at cruise speed. Is water spilling out having a grey-ish color? Any visible black smoke? If yes to either, you are operating the engine beyond its "smoke limit". If no to both, engine is operating at an ok point and whatever soot sticking to transom is normal.
Ski in NC is offline   Reply With Quote
Old 02-10-2017, 02:41 PM   #17
Guru
 
kchace's Avatar
 
City: Brookline, NH
Country: USA
Vessel Name: Blue Heaven
Vessel Model: Albin 43 classic double cabin, twin 135 Lehmans
Join Date: Sep 2013
Posts: 1,601
Don't know if its good, bad or indifferent, but I have twin Lehman 135's of 80's vintage and have never found any soot anywhere on the boat even after 3 years of cruising with it.

Ken
kchace is offline   Reply With Quote
Old 02-10-2017, 02:49 PM   #18
Guru
 
Nomad Willy's Avatar
 
City: Concrete Washington State
Country: USA
Vessel Name: Willy
Vessel Model: Willard Nomad 30'
Join Date: Oct 2007
Posts: 16,093
I'm not so sure "modern" engine design and materials will guarantee a clean stern. I've seen many Volkswagon diesels w a considerably modern engine including turbocharger going down the road w a sooty butt.
Maybe there's a sensor that senses one cylinder is lean and enrichens all four cylinders to compensate. ??
__________________
Eric

North Western Washington State USA
Nomad Willy is online now   Reply With Quote
Old 02-10-2017, 03:28 PM   #19
Senior Member
 
Blissboat's Avatar
 
City: Jacksonville Beach, FL
Country: USA
Vessel Name: Shallow Minded
Vessel Model: Shoal Cat
Join Date: May 2015
Posts: 470
Quote:
Originally Posted by Nomad Willy View Post
I'm not so sure "modern" engine design and materials will guarantee a clean stern. I've seen many Volkswagon diesels w a considerably modern engine including turbocharger going down the road w a sooty butt.
Maybe there's a sensor that senses one cylinder is lean and enrichens all four cylinders to compensate. ??
Over time & miles, my TDi increasingly left visible smoke under acceleration. The diagnostics showed no code that would explain it. But, during each timing belt service, I spent a lot of time cleaning black gunk out of the intake tract downstream from the EGR (exhaust gas recirculator). After breathing in enough exhaust gas, the butterfly plate that closes the intake on shutdown became so caked that it was reducing intake air. Apparently the electronic control module couldn't compensate enough to maintain clean combustion, ergo - black smoke.

After I installed a deadplate over the EGR port, problem solved. In doing that I admittedly negated part of the engine's so-called "clean-exhaust" technology, but OTOH reducing the visible smoke (unburned hydrocarbon particulates) in my exhaust is a good thing.

Enough TDi owners who pay attention to their diesels seem to have been adopting the same tactic, so much so that EGR "deadplate" kits are available on-line.
__________________
“Believe me, my young friend, there is nothing - absolutely nothing - half so much worth doing as simply messing about in boats.”
― Kenneth Grahame, The Wind in the Willows
Blissboat is offline   Reply With Quote
Old 02-10-2017, 03:29 PM   #20
Guru
 
Lepke's Avatar
 
City: Between Oregon and Alaska
Country: US
Vessel Name: Charlie Harper
Vessel Model: Wheeler Shipyard 83'
Join Date: Jun 2016
Posts: 1,615
Diesels produce soot. Excessive soot when an engine is in spec can be insufficient air getting to the engine. Caused by restrictive vents, dirty air filter or sound dampener.
Often, yacht owners, complaining of engine noise, restrict the vents with baffles or other sound proofing materials. Some boats are built without enough vent area. Diesels require much more air than gas engines.
__________________

Lepke is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





All times are GMT -5. The time now is 01:41 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012
×