Reply
 
Thread Tools Search this Thread Display Modes
 
Old 08-12-2017, 03:53 PM   #1
Senior Member
 
Dave_E's Avatar
 
City: La Conner, WA
Country: USA
Vessel Name: Agnus Dei
Vessel Model: 36' Shin Shing
Join Date: Sep 2014
Posts: 225
Lehman Maintenance

Hi All,

Don't get the boat for another 2 weeks, time to study. Was reading the Lehman owners manual. Couple questions for ya'll.

What is achieved by "cleaning" the lift pump every 200 hrs? It's just super filtered fuel in and out right?

Second, Do you really take all injectors out for servicing every 400 hours? What is "serviced"?

This new old boat of mine has been sitting for who knows how long in a boat house. Looks good, starts right up and ran well, sounded good to the surveyor. It's got close to 4000 hours on it. It topped out at 2200 RPM with lots of black smoke and that "You're killing me" smell. 1800 RPM purrs and no black smoke.

Thanks - Dave
__________________
Advertisement

__________________
GOD, Family, career
Dave_E is offline   Reply With Quote
Old 08-12-2017, 04:57 PM   #2
Guru
 
djmarchand's Avatar
 
City: Litchfield, Ct/Punta Gorda, Fl
Country: USA
Vessel Model: Atlas Pompano 23
Join Date: Aug 2012
Posts: 4,759
Most of those recommendations were from the days before modern fuel, oils and fuel filtering. I can't imagine what cleaning the lift pump means and injectors can easily go several thousand hours before doing anything to them.

From the numbers you indicated, your boat is over propped like most older trawlers. If you only run at 1,800 then you will be fine as you are. But if you want to run any higher I would take a couple of inches of pitch out of the prop (any prop shop can do this) to reduce load and let it get up to 2,400 or more at wot. The Lehman is rated to make its maximum hp at 2500. The black smoke should go away then.

David
__________________

djmarchand is offline   Reply With Quote
Old 08-13-2017, 09:16 AM   #3
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: 1,566
Completely agree with what David said.

Ken
kchace is offline   Reply With Quote
Old 08-14-2017, 02:07 PM   #4
Veteran Member
 
Nordic Star's Avatar
 
City: Channel Islands
Country: United States
Vessel Name: Nordic Star
Vessel Model: 1969 Pilot House Trawler
Join Date: Dec 2016
Posts: 62
Love your priorities! GOD/Family/Career! Have any pics? What size Lehman do you have?
Nordic Star is offline   Reply With Quote
Old 08-14-2017, 03:11 PM   #5
Senior Member
 
Dave_E's Avatar
 
City: La Conner, WA
Country: USA
Vessel Name: Agnus Dei
Vessel Model: 36' Shin Shing
Join Date: Sep 2014
Posts: 225
Quote:
Originally Posted by Nordic Star View Post
Love your priorities! GOD/Family/Career! Have any pics? What size Lehman do you have?
Hi NS,

Thanks for the shout out. I just put a few pics on my profile album, more to come. Lehman 120, what else?

Dave
__________________
GOD, Family, career
Dave_E is offline   Reply With Quote
Old 08-23-2017, 11:15 AM   #6
Senior Member
 
City: Subic Bay
Country: Philippines
Join Date: Aug 2017
Posts: 194
Re the Fuel lift pump: the Ford Lehman came out with a fully serviceable fuel lift pump (which most are not) there is a screen inside which can be cleaned but as you point out after coming through the inline filtration of modern times it's unlikely to get blocked and @ around $100 replacement most wouldn't bother,

Saying that when lift pumps start to fail you will notice a decrease of RPM and speed as the injection pump requires a minimum pressure to operate to specifications

An interesting fact re your RPM and HP curves is that yes Max HP is at 2500 and approx 120 Hp but your maximum torgue is at 1800 RPM at approx 240 ft/lbs

The torgue at 2500 RPM is less @ approx 225 ft/lbs (Which is normal ) Higher RPM past a certain point the torgue is reduced!

Cheers Steve
__________________

CaptSteve53 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 12:59 AM.


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
×