Reply
 
Thread Tools Search this Thread Display Modes
 
Old 07-16-2021, 05:46 PM   #1
Senior Member
 
City: Northport
Join Date: Jun 2018
Posts: 259
Lehman 120 (2715E) Duty Rating?

Hi Everyone.

Did a search on forum and internet and could not find an answer. My manuals on on the boat 45 min away. (Not sure its in there anyways)

I am going to take a long run in my 26 Groverbuilt (downeast) with a 120 Lehman. The Lehman, drive train, and boat have been maintain impeccably maintained (i mean impeccably, people laugh at me for how much I spend and work on that boat) and has about 2000 hours.

The run will be at about 48 continuous hours (no stops, no turning off the engine). The engine will be running around 1700 rpms.

In the past, I have run her for 12 hours straight at 2200 with no problems. (Several times in a few week period)

Is the engine rated for continuous duty? And if no rating is available, i would like to get opinions from folks. I think ill be fine, but i will be in blue water for about 36 of those 48 hours and just wanted to “check myself” to make sure I’m not missing anything. (It would get very lonely 200 or so miles off shore)

Thank in advance for your time and thoughts

Anthony
Alisske is offline   Reply With Quote
Old 07-16-2021, 05:49 PM   #2
Guru
 
City: Rochester, NY
Vessel Name: Hour Glass
Vessel Model: Chris Craft Catalina 381
Join Date: Aug 2019
Posts: 3,956
At 1700 I wouldn't worry. Maybe shut down at some point to check the oil, but in general, an engine being run at a power level that it can handle continuously should be fine to run non stop until oil change time.

I've run my gassers for 12 hours straight without a second thought. And on that same note I've run them 33 hours in 3 days without so much as a hiccup.
rslifkin is offline   Reply With Quote
Old 07-16-2021, 06:05 PM   #3
Senior Member
 
City: Northport
Join Date: Jun 2018
Posts: 259
Thank you. Appreciate it
Alisske is offline   Reply With Quote
Old 07-16-2021, 06:11 PM   #4
Valued Technical Contributor
 
DavidM's Avatar
 
City: Litchfield, Ct
Join Date: Aug 2012
Posts: 6,043
1,700 rpm is about 70% of wot rpm for that engine. That makes it at about 50% of rated power. 60 hp over long term, probably forever isn't going to hurt that engine.

I don't think Lehman was sophisticated enough to publish continuous power loadings. Their OPs manual for that engine doesn't show a prop power curve.

If you don't have it, PM me with your email address and I will send it to you. It is too big for an attachment- more than 7 Mb.

Dvid
DavidM is online now   Reply With Quote
Old 07-16-2021, 06:32 PM   #5
Senior Member
 
City: Northport
Join Date: Jun 2018
Posts: 259
Thanks for the reply. I have the manuals, but appreciate the offer. I actually have the laminated in a nice plastic binder, lmao. Spend plenty of time with them.

Thanks again
Alisske is offline   Reply With Quote
Old 07-16-2021, 06:55 PM   #6
TF Site Team
 
Comodave's Avatar
 
City: Au Gres, MI
Vessel Name: Black Dog
Vessel Model: Formula 41PC
Join Date: Jul 2015
Posts: 12,958
You wonít have any issues short of some major breakdown. I usually shut down at 24 hours and check oil level. Have a good trip.
__________________
Boat Nut:
If you are one there is no explanation necessary.
If you arenít one, there is no explanation possible.
Comodave is online now   Reply With Quote
Old 07-16-2021, 07:59 PM   #7
Guru
 
OldDan1943's Avatar
 
City: Aventura FL
Vessel Name: Kinja
Vessel Model: American Tug 34 #116
Join Date: Oct 2017
Posts: 8,547
If your Lehman is anything like my Lugger, natural aspiration, you wont have a lick of trouble. Shut down long enough to check the oil once or twice a day. Watch the temp, oil pressure and water flow.
Those engines are from the good ole days...... built like a battle ship and had no concept of less than "continuous." Maybe once an hour run up the RPMs for 10 minutes or more, to clean out the engine.
I might suggest you change the impeller before you start the trip. Take along a couple spare impellers for your Lehman and your generator, enough oil for an oil change and filter.
Ah LOTS of toilet paper too!!!
__________________
The meek will inherit the earth but, the brave will inherit the seas.
OldDan1943 is online now   Reply With Quote
Old 07-16-2021, 08:37 PM   #8
Senior Member
 
City: Northport
Join Date: Jun 2018
Posts: 259
Lol. Thanks for the feedback. Its naturally aspirated. I change the impeller each year and have a few spares on board.

I will set up a schedule to check the oil. (Hate to turn it off, lmao).

A
Alisske is offline   Reply With Quote
Old 07-16-2021, 08:48 PM   #9
Guru
 
psneeld's Avatar
 
City: Ft Pierce
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 24,386
Quote:
Originally Posted by Alisske View Post
Lol. Thanks for the feedback. Its naturally aspirated. I change the impeller each year and have a few spares on board.

I will set up a schedule to check the oil. (Hate to turn it off, lmao).

A
If you have a good idea what the oil burn rate is per hour, no need to shut down for you trip.

Heck one of our members has already run and old Lehman to Europe and back without shutting it down to check for oil.
psneeld is offline   Reply With Quote
Old 07-16-2021, 08:54 PM   #10
Guru
 
OldDan1943's Avatar
 
City: Aventura FL
Vessel Name: Kinja
Vessel Model: American Tug 34 #116
Join Date: Oct 2017
Posts: 8,547
Quote:
Originally Posted by Alisske View Post
Lol. Thanks for the feedback. Its naturally aspirated. I change the impeller each year and have a few spares on board.

I will set up a schedule to check the oil. (Hate to turn it off, lmao).

A
We all know that feeling. Check it in 12 hours, noting the level and then again in another 12 hours. If there is no change, checking it again just might be unnecessary.
You are looking for oil consumption.... hence the extra oil.
__________________
The meek will inherit the earth but, the brave will inherit the seas.
OldDan1943 is online now   Reply With Quote
Old 07-16-2021, 09:33 PM   #11
Senior Member
 
City: Northport
Join Date: Jun 2018
Posts: 259
On my 12 hour 2200 RPM runs, it may burn less than a quart. Maybe a half quart. Hard to tell on the stick.

But I feel better just running it buy folks and appreciate the feedback. Sometimes I get over confident in my boat, lmao.

Thx again
Alisske is offline   Reply With Quote
Old 07-16-2021, 10:27 PM   #12
TF Site Team
 
Comodave's Avatar
 
City: Au Gres, MI
Vessel Name: Black Dog
Vessel Model: Formula 41PC
Join Date: Jul 2015
Posts: 12,958
If you donít have regular problems starting the engine it shouldnít be any different.
__________________
Boat Nut:
If you are one there is no explanation necessary.
If you arenít one, there is no explanation possible.
Comodave is online now   Reply With Quote
Old 07-16-2021, 10:56 PM   #13
Guru
 
BruceK's Avatar
 
City: Sydney
Vessel Name: Sojourn
Vessel Model: Integrity 386
Join Date: Oct 2011
Posts: 11,711
Unreliable memory says the Lehman Manual has output chart graphs, but it could be just torque figures. Not heard of "ratings" for the engine.

TF Member Richard crossed the Atlantic,and made other long transits using an L120, without turning it off.
__________________
BruceK
2005 Integrity 386 "Sojourn"
Sydney Australia
BruceK is offline   Reply With Quote
Old 07-16-2021, 11:40 PM   #14
Senior Member
 
City: Maple Bay BC
Vessel Name: Orca
Vessel Model: RFC Coaster 23
Join Date: Dec 2016
Posts: 233
Something that I had never heard of before, is checking the oil with the engine still running. My Perkins manual says you can check the oil while still running, but only at 1000 rpm or less. I'm not sure how the level would be different on the dip stick between running and stopped, but I'm sure there must be a difference.
Does your Lehman manual have a similar instruction?
Greg S is offline   Reply With Quote
Old 07-17-2021, 12:55 AM   #15
Senior Member
 
City: Northport
Join Date: Jun 2018
Posts: 259
I betcha it would be the same with Lehman. (But I i don't think its in the manual)

I am not leaving until October, so ill get some baseline with it running and try to establish a oil burn rate.

That being said, I’m sure it will start again as folks have mentioned. That motor has always started for 10 years. Every time.

20 something years ago, i redid an old 21foot 1972 whaler. “Top to bottom, electrical, gas, gelcoat, brand new single 225 yamaha. I was so excited about having a super reliable boat for the first time in my life (with the exception of my pops boats) i took it offshore fishing all the time. Would run to the canyons.

After about 2 years with of trips, i was talking to an old salt (he was the oldest and most respected guy in the harbor). He liked the fact i fished far off in a center console and caught what i caught etc…. I could tell he was impressed with a young “wipper snapper”.

I started to tell him that i liked the quite when it got dark and the seas laid down. He then looked at me with disbelief and said “you turn the engine off?!?”

His reaction shook me, lmao. (I immediately went and bought a brand new yamaha 9.9 high thrust kicker and had someone fab a kicker plate for my boat)

Ill never forget that. Every time i turn the boat off far out, i think of him (and worry)
Alisske is offline   Reply With Quote
Old 07-17-2021, 06:52 AM   #16
Guru
 
jleonard's Avatar
 
Join Date: Jun 2008
Posts: 4,358
Quote:
Originally Posted by DavidM View Post
1,700 rpm is about 70% of wot rpm for that engine. That makes it at about 50% of rated power. 60 hp over long term, probably forever isn't going to hurt that engine.

I don't think Lehman was sophisticated enough to publish continuous power loadings. Their OPs manual for that engine doesn't show a prop power curve.

If you don't have it, PM me with your email address and I will send it to you. It is too big for an attachment- more than 7 Mb.

Dvid
I have a prop curve in my manual. At 1700 rpm it looks like about 70 hp which is about 58% of full power.
__________________
Jay Leonard

New Port Richey,Fl
jleonard is offline   Reply With Quote
Old 07-17-2021, 07:18 AM   #17
Arc
Senior Member
 
City: Long island
Vessel Model: Eastern
Join Date: Aug 2018
Posts: 451
I’m just guessing it’s a 700 mile trip in a 26’ low freeboard boat. Would love to know your destination.
Arc is offline   Reply With Quote
Old 07-17-2021, 09:09 AM   #18
Senior Member
 
City: Northport
Join Date: Jun 2018
Posts: 259
Quote:
Originally Posted by Arc View Post
I’m just guessing it’s a 700 mile trip in a 26’ low freeboard boat. Would love to know your destination.
Yeah, i was avoiding that, lol. I just did not want folks to beat on me and tell me I’m gonna die or whatever. So be gentle on me folks. I’ve driven the boat from NYC straight through to Cape Cod in one shot, back and forth. Those were 20 hour trips, but not far from land. (And that was without autopilot - i just installed brand new autopilot last week)

Rough float plan: Montauk to Hatteras, Hatteras to the Bahamas. Ill make an assessment after that, but will probably push south after that.
Alisske is offline   Reply With Quote
Old 07-17-2021, 09:20 AM   #19
Arc
Senior Member
 
City: Long island
Vessel Model: Eastern
Join Date: Aug 2018
Posts: 451
Not crazy at all. You must have good sea legs. That boat is a ship in a bottle out there. I worked with Grover way back when he built them in Freeport.
Arc is offline   Reply With Quote
Old 07-17-2021, 09:20 AM   #20
Guru
 
psneeld's Avatar
 
City: Ft Pierce
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 24,386
Groverbuilt crossed the Atlantic a few years back.....

https://www.google.com/url?sa=t&sour...2nzzR0X6jyRfYS
psneeld 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


» Trawler Port Captains
Port Captains are TF volunteers who can serve as local guides or assist with local arrangements and information. Search below to locate Port Captains near your destination. To learn more about this program read here: TF Port Captain Program





All times are GMT -5. The time now is 09:59 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012