Reply
 
Thread Tools Search this Thread Display Modes
 
Old 08-02-2020, 09:54 AM   #1
Member
 
City: Benicia
Vessel Name: Never Ends
Vessel Model: Grand Banks
Join Date: Aug 2019
Posts: 10
Ford Lehman 120 Rotation Question

Hi All, I’m in Looking at purchasing a used Lehman 120 to replace my STBD motor in our GB 42. Does anyone know if the PORT and STBD motors rotate differently or is this done via the transmission? And if the motors rotate opposite, how do you know which is which?
__________________
Advertisement

GrandBanks42 is offline   Reply With Quote
Old 08-02-2020, 10:06 AM   #2
Guru
 
City: Boston
Vessel Name: Adelante
Vessel Model: IG 30
Join Date: Nov 2016
Posts: 1,208
Typically opposite rotation is handled by the Velvet Drive CR2 transmission. The CR2 reduction gear housing has ribs contrasted to the mostly smooth 71C reduction housing. (the aft end of the transmission)
__________________

SoWhat is offline   Reply With Quote
Old 08-02-2020, 10:55 AM   #3
Scraping Paint
 
City: Bainbridge Island Washington
Vessel Name: Elmore
Vessel Model: 1890 Custom Tug
Join Date: Jul 2020
Posts: 131
Quote:
Originally Posted by GrandBanks42 View Post
Hi All, I’m in Looking at purchasing a used Lehman 120 to replace my STBD motor in our GB 42. Does anyone know if the PORT and STBD motors rotate differently or is this done via the transmission? And if the motors rotate opposite, how do you know which is which?
It is only the rare installation that will counter rotate the engines, this is typically done through the transmission. Most ‘normal rotation’ engines will turn clockwise when viewed from the rear looking forward, however the Lehman is a British design so it may be the other way, I don’t recall.
Caphenning is offline   Reply With Quote
Old 08-02-2020, 12:43 PM   #4
Guru
 
porman's Avatar
 
City: Duvall, Wa. USA
Vessel Name: Beach Music II
Vessel Model: 2003 Mainship 430 Trawler
Join Date: Aug 2014
Posts: 754
Quote:
Originally Posted by Caphenning View Post
It is only the rare installation that will counter rotate the engines, this is typically done through the transmission. Most ‘normal rotation’ engines will turn clockwise when viewed from the rear looking forward, however the Lehman is a British design so it may be the other way, I don’t recall.
Um, my Yanmars turn clockwise when viewed from the front. So did my Volvo.
porman is offline   Reply With Quote
Old 08-02-2020, 04:22 PM   #5
Guru
 
kchace's Avatar
 
City: Brookline, NH
Vessel Name: Blue Heaven
Vessel Model: Albin 43 classic double cabin, twin 135 Lehmans
Join Date: Sep 2013
Posts: 2,054
Nobody answered the original question directly yet, so I will...

ALL Lehman’s rotate in one direction only.

Ken
kchace is offline   Reply With Quote
Old 08-02-2020, 04:40 PM   #6
Technical Guru
 
Ski in NC's Avatar
 
City: Wilmington, NC
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 6,185
Yep, all Lehmans I've seen are CW as viewed at the front, looking aft. Called std rotation. Change in prop shaft rotation is done with the gears. Some engines like DD, Perkins, Cummins can be rev rotation, but that goes back like 30yrs for those brands.
Ski in NC is offline   Reply With Quote
Old 08-02-2020, 05:34 PM   #7
Guru
 
Pete Meisinger's Avatar
 
City: Oconto, WI
Vessel Name: Best Alternative
Vessel Model: 36 Albin Aft Cabin
Join Date: Oct 2012
Posts: 2,087
Gassers and outboards are often counter rotation. F.L.s are not. Ask Brian at A.D.

Pete
Pete Meisinger is offline   Reply With Quote
Old 08-06-2020, 08:58 AM   #8
Member
 
City: Benicia
Vessel Name: Never Ends
Vessel Model: Grand Banks
Join Date: Aug 2019
Posts: 10
Thank you all so much for your reply’s, I really appreciate it. One thing I’ve learned is that no matter how observant I am, it seems there is always something I miss to observe, hence, after all these years of cruising our GB, I’ve never paid attention to the motor(s) rotation
GrandBanks42 is offline   Reply With Quote
Old 08-06-2020, 09:25 AM   #9
Enigma
 
RT Firefly's Avatar
 
City: Slicker?
Join Date: Oct 2007
Posts: 15,575
Greetings,
Mr. 42. It's a good day when you learn something but I figure as long as things are working as they should, it's OK. Sing along if you're so inclined...


__________________
RTF
RT Firefly is online now   Reply With Quote
Old 08-06-2020, 10:55 AM   #10
Guru
 
Moonfish's Avatar


 
City: Port Townsend, WA
Vessel Name: Traveler
Vessel Model: Cheoy Lee 46 LRC
Join Date: Nov 2011
Posts: 1,246
Quote:
Originally Posted by kchace View Post
Nobody answered the original question directly yet, so I will...

ALL Lehman’s rotate in one direction only.

Ken
Hey, it only took 5 replies to answer the OP's question. Not too bad!
__________________

__________________
Darren
Port Townsend, WA
m/v Traveler - '79 Cheoy Lee 46 LRC
https://www.pacificnwboatertested.com
Moonfish 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 07:08 AM.


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
×