Reply
 
Thread Tools Display Modes
 
Old 08-23-2015, 01:11 AM   #1
Guru
 
BruceK's Avatar
 
Join Date: Oct 2011
Posts: 7,562
Lehman 120 R/Water Pump

I imported two replacement updated Lehman 120 raw water pumps from American Diesel. USD $495 each, plus shipping.
Here`s a pic of the hefty looking Johnson pump units, mated to AD parts, showing both ends plus accompanying Service Bulletin. I painted the bits AD undercoated, maybe I should have painted everything, I might yet. Fitting involves cementing a pin (supplied)into the block to close off an oil supply, I`m going to have the mechanic fit them.
Attached Thumbnails
Click image for larger version

Name:	IMG_0394.jpg
Views:	76
Size:	197.6 KB
ID:	43451   Click image for larger version

Name:	IMG_0395.jpg
Views:	70
Size:	178.5 KB
ID:	43452  
__________________
Advertisement

__________________
BruceK
Island Gypsy 36 Europa "Doriana"
Sydney Australia
BruceK is offline   Reply With Quote
Old 08-23-2015, 02:30 AM   #2
Scraping Paint
 
City: -
Country: -
Join Date: Oct 2007
Posts: 13,748
We put Johnson pumps on our two FL120s some ten years ago or more. They are one of the four best improvements one can make to an FL120. We went with the larger 1" pump on Bob Smith's and our diesel shop's advice rather than the standard 3/4" pump. The 1" pump is used on the FL135 but it fits the FL120 just fine. It gives a higher water flow rate which significantly lowers the operating temperature of the transmissions.
Attached Thumbnails
Click image for larger version

Name:	image.jpg
Views:	69
Size:	169.2 KB
ID:	43453  
__________________

Marin is offline   Reply With Quote
Old 08-23-2015, 07:57 AM   #3
Guru
 
Forkliftt's Avatar
 
City: Biloxi Mississippi
Country: USA
Vessel Name: Patricia Louise II
Vessel Model: 1983 42' Present Sundeck
Join Date: Oct 2007
Posts: 2,433
Quote:
Originally Posted by BruceK View Post
I imported two replacement updated Lehman 120 raw water pumps from American Diesel. USD $495 each, plus shipping.
Here`s a pic of the hefty looking Johnson pump units, mated to AD parts, showing both ends plus accompanying Service Bulletin. I painted the bits AD undercoated, maybe I should have painted everything, I might yet. Fitting involves cementing a pin (supplied)into the block to close off an oil supply, I`m going to have the mechanic fit them.

Nice work! The pictures always make a great post.


1983 Present 42 Sundeck
Twin Lehman 135's
✌️
__________________
Steve Point Cadet/ Biloxi, Mississippi USA
*Present 42 twin 135 Lehmans
Forkliftt is offline   Reply With Quote
Old 08-23-2015, 08:39 AM   #4
Newbie
 
City: crystal river fl
Country: usa
Join Date: Aug 2015
Posts: 4
i need a service and parts manual for my ford Lehmans 120 diesel,can anybody direct me
coolman is offline   Reply With Quote
Old 08-23-2015, 08:40 AM   #5
Newbie
 
City: crystal river fl
Country: usa
Join Date: Aug 2015
Posts: 4
Its a 1974 i think
coolman is offline   Reply With Quote
Old 08-23-2015, 09:47 AM   #6
Guru
 
siestakey's Avatar
 
City: Sarasota,FL/Thomasville,GA
Country: USA
Vessel Name: Steppin Stone IV
Vessel Model: Marine Trader Kelly Trawler 46
Join Date: Jul 2013
Posts: 1,271
Send a message via Skype™ to siestakey
Quote:
Originally Posted by Marin View Post
We put Johnson pumps on our two FL120s some ten years ago or more. They are one of the four best improvements one can make to an FL120. We went with the larger 1" pump on Bob Smith's and our diesel shop's advice rather than the standard 3/4" pump. The 1" pump is used on the FL135 but it fits the FL120 just fine. It gives a higher water flow rate which significantly lowers the operating temperature of the transmissions.
Marin

One of friends a retired professor has the same engines and although his do not run hot they run on the warm side this may be a fix for him

Cool I think Psnead has those manuals not sure what year but saw several years back on another forum he had them
siestakey is offline   Reply With Quote
Old 08-23-2015, 11:57 AM   #7
Scraping Paint
 
City: -
Country: -
Join Date: Oct 2007
Posts: 13,748
The 1" pumps do not alter the operating temperature of the engine because that is controlled by the thermostat. The higher volume of raw water through the transmission cooler does lower the temperature of the transmission, however.
Marin is offline   Reply With Quote
Old 08-23-2015, 12:06 PM   #8
Guru
 
Capt.Bill11's Avatar
 
City: Sarasota/Ft. Lauderdale
Country: USA
Join Date: Apr 2014
Posts: 5,422
Bruce, consider adding speed seals to the pumps.
Capt.Bill11 is offline   Reply With Quote
Old 08-23-2015, 05:21 PM   #9
Guru
 
Forkliftt's Avatar
 
City: Biloxi Mississippi
Country: USA
Vessel Name: Patricia Louise II
Vessel Model: 1983 42' Present Sundeck
Join Date: Oct 2007
Posts: 2,433
Bill, what are the speed seals?


1983 Present 42 Sundeck
Twin Lehman 135's
✌️
__________________
Steve Point Cadet/ Biloxi, Mississippi USA
*Present 42 twin 135 Lehmans
Forkliftt is offline   Reply With Quote
Old 08-23-2015, 06:07 PM   #10
Guru
 
LarryM's Avatar
 
City: League City, TX
Country: USA
Vessel Name: Pelago
Vessel Model: Wellcraft 3300 Coastal
Join Date: Aug 2011
Posts: 843
Quote:
Originally Posted by Capt.Bill11 View Post
Bruce, consider adding speed seals to the pumps.
Big +1 on Speedseal and Speedseal Life

I particularly like the newer Speedseal Life design that incorporates a replaceable bearing disk assembly.
__________________
Larry
M/V Pelago
LarryM is online now   Reply With Quote
Old 08-23-2015, 07:39 PM   #11
Guru
 
BruceK's Avatar
 
Join Date: Oct 2011
Posts: 7,562
Quote:
Originally Posted by Capt.Bill11 View Post
Bruce, consider adding speed seals to the pumps.
Thanks, good thought.
coolman, a Lehman engine book, including exploded parts diagrams and lists, came with my boat. I don`t like your chances of finding one, but suggest you ask briansmithadc@aol.com, American Diesel Corp, the effective successors to Lehman for help. Bob Smith was VP of Lehman and wrote the intro in my engine book. Some parts are original Ford base engine parts, others are the Lehman marinizing parts, you can get some Ford parts from tractor dealers, the base engine was used in many trucks tractors etc.
__________________
BruceK
Island Gypsy 36 Europa "Doriana"
Sydney Australia
BruceK is offline   Reply With Quote
Old 08-25-2015, 01:15 PM   #12
Newbie
 
City: East Lyme
Country: USA
Vessel Name: Au Naturel
Vessel Model: Albin 36 Trunk Trawler
Join Date: Aug 2015
Posts: 3
coolman - American Diesel (Bob Smith and son) in Virginia. (americandieseldorp DOT COM) They can provide you with anything you need for the Lehman.
Rebuckleyct is offline   Reply With Quote
Old 08-25-2015, 01:24 PM   #13
Scraping Paint
 
City: -
Country: -
Join Date: Oct 2007
Posts: 13,748
All the manuals for the FL120 are on the Grand Banks owners forum. I believe one has to be a member to access them. Our boat came with all the original manuals for the engine (operating, shop, and parts manuals) plus an original operating manual for the Ford of England Dorset diesel which is the base engine for the FL120.
Marin is offline   Reply With Quote
Old 08-25-2015, 11:05 PM   #14
Veteran Member
 
City: Channel islands ca
Country: Usa
Vessel Name: Lillie Ruth
Vessel Model: 78 Grand banks 36 classic
Join Date: Apr 2012
Posts: 31
FYI, in spite of what the FL 120 book says, Bob Smith says to adjust the valves on the 120 cold. The head of the 135 is the same as the 120. Learned this at his class.

Dan
Dan Cahn is offline   Reply With Quote
Old 08-25-2015, 11:40 PM   #15
Scraping Paint
 
City: -
Country: -
Join Date: Oct 2007
Posts: 13,748
Quote:
Originally Posted by Dan Cahn View Post
FYI, in spite of what the FL 120 book says, Bob Smith says to adjust the valves on the 120 cold. s.
Our Ford of England shop manual for the Ford Dorset engine (base engine for the FL120) specifies that when the engine is reassembled after a teardown for overhaul the valve clearances should be initially set with the engine cold. However, the manual goes on to say that the clearances should checked again and readjusted if necessary with the engine at its normal operating temperature. I would be inclined to follow Ford's service specifications rather than Bob's.
__________________

Marin is offline   Reply With Quote
Reply

Thread Tools
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 10:41 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012