How To Service Lehman 120 Oil Cooler

04-01-2015, x:48 PM

We supercede ours when they start looking iffy. We always use the cupro-nickel coolers. They toll somewhat more merely they last a LOT longer.

We have changed our oil and manual coolers once in the last 17 years.

04-02-2015, 07:29 AM

Quote:

Originally Posted by Marin View Post

We supersede ours when they start looking iffy. We always use the cupro-nickel coolers. They cost somewhat more but they final a LOT longer.

We have inverse our oil and transmission coolers once in the final 17 years.

Yes, on the cupro-nickel! Hour many hours?

[QUOT,E=BruceK;321628]...at 2000 hours...[/QUOTE]

We modify ours every 1700-2000 hours and change the transmission cooler at the same time. The oil libation was less than $200 for the last 1 I bought and the manual cooler was less than $135.

04-02-2015, xi:21 AM

At $100-$120 each (for a Lehman oil cooler), irresolute them every five-8-x(whatever) years is cheap insurance. Dissimilar a leak in the engine heat exchanger, a leak in an oil cooler volition speedily cause harm and you'd exist unlikely to take hold of it in time. If the engine oil or transmission oil cooler started leaking yous would either - lose oil and/or mix sea h2o into the oil. Either would trash the engine or transmission pretty quickly. I merely changed out mine since I KNOW the PO did not and he endemic the boat for ix years.

Ken

04-02-2015, 01:26 PM

The timing that American Diesel says if age is unknown, replace them and keep as spares, which I have done.

Recommended time per Advertizement is thousand hours to primary heat exchanger and 750 for oil and transmission (which are the same).

I replaced mine just before the Atlantic crossing and other then some weeds at the front, it looked great. At that betoken is had >1500 hours on it.

04-02-2015, 01:42 PM

Quote:

Originally Posted by Wxx3 View Post

...Recommended time per AD is 1000 hours to main heat exchanger and 750 for oil and transmission (which are the same)...

Richard: Those numbers seem low. My notes from AD say 2000-3000 hours on the heat exchanger and 1200-1500 on the oil/transmission coolers.

Greg at Bomac Marine recommends every 4 years on the estrus exchanger and every ii years on the oil/transmission coolers. Greg says hours aren't the issue but time is. He suggested that corrosion through electrolysis is what dictates life bridge.

Equally Ken mentioned previously coolers are cheap as compared to the damage they practise if they fail.

04-02-2015, 03:28 PM

As long every bit they run - don't tinker.

(I'm nocking on wood, never changed them on my boats, up to twoscore years of service)

all-time regards / med venlig hilsen
wadden

04-02-2015, 08:12 PM

Many of the oil and transmission heat exchangers sold today for engines like the FL120 do not have the ability to install a zinc anode, nor do they have connection points to tie the exchanger into the boat's bonding system. The cupro-nickel exchangers we utilize are like this.

Our diesel store taught me a smart way to tie the heat exchangers into the boat's bonding system by removing the paint from the barrel of the exhanger where the metallic mounting subclass clamps around it. Then I remove the pigment, or make clean to bright the insides of the two role clamp itself. This electrically connects the heat exchanger to the engine block, which is in turn connected to the boat'southward bonding organization.

Since doing this the outside and inside of the oil and transmission heat exchangers (they are all identical units) remain as pristine as the day nosotros bought them.

04-02-2015, 08:38 PM

Quote:

Originally Posted by kchace View Post

At $100-$120 each (for a Lehman oil cooler), changing them every 5-eight-10(whatever) years is inexpensive insurance. Unlike a leak in the engine heat exchanger, a leak in an oil cooler volition quickly cause impairment and you'd be unlikely to catch it in time. If the engine oil or transmission oil cooler started leaking you would either - lose oil and/or mix sea h2o into the oil. Either would trash the engine or manual pretty apace. I simply changed out mine since I KNOW the PO did not and he owned the boat for nine years.

Ken

While I agree coolers should exist inverse earlier they go bad, I've lost track of how many coolers on Lehman'due south I've seen go bad and I don't recollect ever seeing one trash an engine or tranny.

So it's non automatically the stop of the earth if 1 goes bad.

04-02-2015, 11:31 PM

Quote:

Originally Posted past Marin View Post

Many of the oil and transmission estrus exchangers sold today for engines similar the FL120 practice not have the ability to install a zinc anode, nor do they have connexion points to necktie the exchanger into the boat'southward bonding system. The cupro-nickel exchangers nosotros use are like this.

Our diesel shop taught me a smart manner to tie the heat exchangers into the boat's bonding system by removing the pigment from the butt of the exhanger where the metal mounting subclass clamps around information technology. So I remove the paint, or clean to bright the insides of the two part clamp itself. This electrically connects the heat exchanger to the engine block, which is in turn continued to the gunkhole's bonding organization.

Since doing this the outside and within of the oil and manual rut exchangers (they are all identical units) remain equally pristine every bit the day we bought them.

I never thought of that! I've replaced one and then far but now I'll remove it and clean the butt and clench. Then I'll do the others.

04-03-2015, 03:11 PM

At that place is the FL120 and the FL135 merely I've not heard of an FL125.

The FL120 is said to be a 12,000 to 14,000 hour engine in recreational boat service bold proper operation, service, and maintenance. Merely that's kind of a number out of a lid. I know of FL120s that crapped out with less than 3,000 hours and examples that have gone more than 25,000 hours before needing a major overhaul.

So the number of hours on an FL120 is sort of irrelevant. What IS relevant is how the engines were treated past the people who've been running them.

Depending on that, an FL120 could be about ready to die with 5,200 hours on information technology, or it could have ten,000 or more hours left to become. Yous need to try to learn how the engines were treated and have a QUALIFIED engine surveyor give them a thorough checkout.

That'southward what we did with our PNW boat. Nosotros believe in getting ii surveyors to cheque out a prospectve boat, a hull/systems surveyor and an engine surveyor intimately familiar with the type of engine we're considering. We did our inquiry and that plus a skilful friend whose entire career has been in the marine diesel and generator manufacturing manufacture located supposedly the best FL120 surveyor in the SFO bay expanse and we hired him to check out the engines and generator of the boat we after bought.

In our case the engines had very low hours for the age of the gunkhole, and that concerned u.s.. The explanation was totally plausible but nosotros wanted to confirm the engines' condition for certain.

If the engines you're looking at are FL135s I have no experience with that model of Ford engine (Dover) so can't offer any speculation or advice about them.

04-03-2015, 04:53 PM

Quote:

Originally Posted by FoxtrotCharlie View Post

Not to hijack the thread, but what would you guys consider loftier hours on a Lehman 125hp engine? I'g about to wait at a gunkhole with 5200 hrs - initial online wait seems to be well maintained - clean ER

Our 135 has 8500hrs and going stiff. Might want to start a new thread and perhaps survey to find out other peoples experience. Worst case scenario is you supplant. Factor that into what you're comfortable paying for the boat.

04-01-2015, 10:41 PM	#two
Guru City: Sitka Vessel Model: Transpacific Marine Eagle 32 Join Date: December 2014 Posts: 519	When in doubt throw them out. I replace every 6 years.

04-01-2015, 10:57 PM	#four
Senior Member Urban center: Valley Springs Vessel Proper noun: Lollygag Vessel Model: 1979 42' CHB Europa Join Date: Jan 2012 Posts: 259	Thanks. I'thou going to pressure level test the ones I supersede and keep them as spares. I don't call up they have any leaks since I haven't establish any h2o in the oil or ATF. Information technology looks like a couple of them have been replaced in the final few years only the others look a fiddling old.

04-02-2015, 02:02 AM	#6
Guru City: NARBONNE Vessel Proper noun: 'Snow Mouse.' Vessel Model: BROOM FLYBRIDGE 42. Bring together Date: Apr 2014 Posts: 1,702	I've oasis't replaced any in all my 35 years cruising and never had a trouble. Don't set it if it ain't broke ! If you really feel uncomfortable strip them off, and accept them to a local radiator repair shop and they will clean/pressure exam/renew 'O' rings for you. If you insist on having new ones and have trouble finding them locally Google world wide web.ejbowman.co.uk they design, manufacture and supply engine makers/marinisers worldwide with all types of oil coolers, estrus exchangers, header tanks, intercoolers etc and they'll send you a replacement.

04-02-2015, 06:43 AM	#7
Guru Join Date: Jun 2008 Posts: four,603	I am on the five to vi year plan. One engine and so information technology's relatively cheap. __________________ Jay Leonard New Port Richey,Fl

04-02-2015, 07:29 AM	#eight
TF Site Team Metropolis: Jacksonville Join Date: November 2008 Posts: ten,492	Quote: Originally Posted by Marin We supersede ours when they start looking iffy. We always use the cupro-nickel coolers. They cost somewhat more but they final a LOT longer. We have inverse our oil and transmission coolers once in the final 17 years. Yes, on the cupro-nickel! Hour many hours? [QUOT,E=BruceK;321628]...at 2000 hours...[/QUOTE] We modify ours every 1700-2000 hours and change the transmission cooler at the same time. The oil libation was less than $200 for the last 1 I bought and the manual cooler was less than $135.

How To Service Lehman 120 Oil Cooler

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04-01-2015, x:48 PM	#3
Scraping Paint Metropolis: - Join Engagement: October 2007 Posts: 13,745	We supercede ours when they start looking iffy. We always use the cupro-nickel coolers. They toll somewhat more merely they last a LOT longer. We have changed our oil and manual coolers once in the last 17 years.

04-02-2015, xi:21 AM	#9
Guru City: Brookline, NH Vessel Proper noun: Blue Heaven Vessel Model: Albin 43 archetype double motel, twin 135 Lehmans Join Date: Sep 2013 Posts: 2,118	At $100-$120 each (for a Lehman oil cooler), irresolute them every five-8-x(whatever) years is cheap insurance. Dissimilar a leak in the engine heat exchanger, a leak in an oil cooler volition speedily cause harm and you'd exist unlikely to take hold of it in time. If the engine oil or transmission oil cooler started leaking yous would either - lose oil and/or mix sea h2o into the oil. Either would trash the engine or transmission pretty quickly. I merely changed out mine since I KNOW the PO did not and he endemic the boat for ix years. Ken

04-02-2015, 01:26 PM	#10
Dauntless Honour City: Wrangell, Alaska Vessel Name: Dauntless Vessel Model: Kadey Krogen 42 - 148 Join Date: Jan 2013 Posts: 2,811	The timing that American Diesel says if age is unknown, replace them and keep as spares, which I have done. Recommended time per Advertizement is thousand hours to primary heat exchanger and 750 for oil and transmission (which are the same). I replaced mine just before the Atlantic crossing and other then some weeds at the front, it looked great. At that betoken is had >1500 hours on it.

04-02-2015, 01:42 PM	#11
TF Site Team Metropolis: Jacksonville Bring together Date: November 2008 Posts: 10,492	Quote: Originally Posted by Wxx3 ...Recommended time per AD is 1000 hours to main heat exchanger and 750 for oil and transmission (which are the same)... Richard: Those numbers seem low. My notes from AD say 2000-3000 hours on the heat exchanger and 1200-1500 on the oil/transmission coolers. Greg at Bomac Marine recommends every 4 years on the estrus exchanger and every ii years on the oil/transmission coolers. Greg says hours aren't the issue but time is. He suggested that corrosion through electrolysis is what dictates life bridge. Equally Ken mentioned previously coolers are cheap as compared to the damage they practise if they fail.

04-02-2015, 03:28 PM	#12
Senior Member City: Southern Baltic Vessel Proper name: Due south�marken Vessel Model: AMS xl' Join Date: Jul 2012 Posts: 188	As long every bit they run - don't tinker. (I'm nocking on wood, never changed them on my boats, up to twoscore years of service) all-time regards / med venlig hilsen wadden __________________ best regards / med venlig hilsen Wadden

04-02-2015, 08:12 PM	#13
Scraping Paint City: - Join Appointment: Oct 2007 Posts: xiii,745	Many of the oil and transmission heat exchangers sold today for engines like the FL120 do not have the ability to install a zinc anode, nor do they have connection points to tie the exchanger into the boat's bonding system. The cupro-nickel exchangers we utilize are like this. Our diesel store taught me a smart way to tie the heat exchangers into the boat's bonding system by removing the paint from the barrel of the exhanger where the metallic mounting subclass clamps around it. Then I remove the pigment, or make clean to bright the insides of the two role clamp itself. This electrically connects the heat exchanger to the engine block, which is in turn connected to the boat'southward bonding organization. Since doing this the outside and inside of the oil and transmission heat exchangers (they are all identical units) remain as pristine as the day nosotros bought them.

04-02-2015, 08:38 PM	#14
Guru City: Sarasota/Ft. Lauderdale Bring together Date: Apr 2014 Posts: five,438	Quote: Originally Posted by kchace At $100-$120 each (for a Lehman oil cooler), changing them every 5-eight-10(whatever) years is inexpensive insurance. Unlike a leak in the engine heat exchanger, a leak in an oil cooler volition quickly cause impairment and you'd be unlikely to catch it in time. If the engine oil or transmission oil cooler started leaking you would either - lose oil and/or mix sea h2o into the oil. Either would trash the engine or manual pretty apace. I simply changed out mine since I KNOW the PO did not and he owned the boat for nine years. Ken While I agree coolers should exist inverse earlier they go bad, I've lost track of how many coolers on Lehman'due south I've seen go bad and I don't recollect ever seeing one trash an engine or tranny. So it's non automatically the stop of the earth if 1 goes bad.

04-02-2015, 11:31 PM	#15
Senior Member Urban center: Valley Springs Vessel Name: Lollygag Vessel Model: 1979 42' CHB Europa Bring together Engagement: January 2012 Posts: 259	Quote: Originally Posted past Marin Many of the oil and transmission estrus exchangers sold today for engines similar the FL120 practice not have the ability to install a zinc anode, nor do they have connexion points to necktie the exchanger into the boat'southward bonding system. The cupro-nickel exchangers nosotros use are like this. Our diesel shop taught me a smart manner to tie the heat exchangers into the boat's bonding system by removing the pigment from the butt of the exhanger where the metal mounting subclass clamps around information technology. So I remove the paint, or clean to bright the insides of the two part clamp itself. This electrically connects the heat exchanger to the engine block, which is in turn continued to the gunkhole's bonding organization. Since doing this the outside and within of the oil and manual rut exchangers (they are all identical units) remain equally pristine every bit the day we bought them. I never thought of that! I've replaced one and then far but now I'll remove it and clean the butt and clench. Then I'll do the others.

04-03-2015, 02:53 PM	#sixteen
Guru Urban center: Mississippi Vessel Proper noun: ADAGIO Vessel Model: CHB Present 42 Sundeck Bring together Appointment: Jul 2014 Posts: 906	Not to hijack the thread, but what would you guys consider high hours on a Lehman 125hp engine? I'grand about to look at a boat with 5200 hrs - initial online look seems to be well maintained - clean ER

04-03-2015, 03:11 PM	#17
Scraping Paint Urban center: - Bring together Engagement: Oct 2007 Posts: 13,745	At that place is the FL120 and the FL135 merely I've not heard of an FL125. The FL120 is said to be a 12,000 to 14,000 hour engine in recreational boat service bold proper operation, service, and maintenance. Merely that's kind of a number out of a lid. I know of FL120s that crapped out with less than 3,000 hours and examples that have gone more than 25,000 hours before needing a major overhaul. So the number of hours on an FL120 is sort of irrelevant. What IS relevant is how the engines were treated past the people who've been running them. Depending on that, an FL120 could be about ready to die with 5,200 hours on information technology, or it could have ten,000 or more hours left to become. Yous need to try to learn how the engines were treated and have a QUALIFIED engine surveyor give them a thorough checkout. That'southward what we did with our PNW boat. Nosotros believe in getting ii surveyors to cheque out a prospectve boat, a hull/systems surveyor and an engine surveyor intimately familiar with the type of engine we're considering. We did our inquiry and that plus a skilful friend whose entire career has been in the marine diesel and generator manufacturing manufacture located supposedly the best FL120 surveyor in the SFO bay expanse and we hired him to check out the engines and generator of the boat we after bought. In our case the engines had very low hours for the age of the gunkhole, and that concerned u.s.. The explanation was totally plausible but nosotros wanted to confirm the engines' condition for certain. If the engines you're looking at are FL135s I have no experience with that model of Ford engine (Dover) so can't offer any speculation or advice about them.

04-03-2015, 03:15 PM	#18
Guru Urban center: Mississippi Vessel Name: ADAGIO Vessel Model: CHB Present 42 Sundeck Bring together Date: Jul 2014 Posts: 906	Many thank you Marin - yes, I will definitely get engine surveys if I choose to go on. Owner has oil analysis records, so nosotros'll have a starting point for new analysis comparing. Thank you once again.

04-03-2015, 04:53 PM	#xix
Senior Fellow member City: Warwick, RI Vessel Proper name: Susan Helena Vessel Model: Albin40 Join Appointment: Oct 2014 Posts: 449	Quote: Originally Posted by FoxtrotCharlie Not to hijack the thread, but what would you guys consider loftier hours on a Lehman 125hp engine? I'g about to wait at a gunkhole with 5200 hrs - initial online wait seems to be well maintained - clean ER Our 135 has 8500hrs and going stiff. Might want to start a new thread and perhaps survey to find out other peoples experience. Worst case scenario is you supplant. Factor that into what you're comfortable paying for the boat.

04-03-2015, 04:59 PM	#twenty
Guru City: Mississippi Vessel Proper noun: ADAGIO Vessel Model: CHB Present 42 Sundeck Join Engagement: Jul 2014 Posts: 906	Thanks - merely got more info - the engines are Lehman 2715E - 120hp. Boat is 1983. Is this an older model. From what I can tell they were made in The netherlands. Now, i call up the hijack is complete :-)