Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 08-07-2015, 22:15   #1

Join Date: Aug 2014
Posts: 2
Yanmar 3gmd conversion to fresh water

In all the listing I can find the 3gmd does not list it as fresh or raw water cooled. All other models do. Is there a difference between the 3gmd & 3gmf other than raw or fresh cooled. I Do a visual inspection on my 3gmd it appears all of the recirculating pump & peripherals will bolt right on the motor OK. Then add an exchanger & reroute a few cooling lines & I am good. My boat has always been a Lake Michgan boat but now I am heading to the ocean & I want to convert to freshwater cooling. Any & all advce & comments are appreciated

IronSamFlint is offline   Reply With Quote
Old 09-07-2015, 04:42   #2
Registered User

Join Date: Oct 2009
Location: australia
Posts: 433
Re: Yanmar 3gmd conversion to fresh water

To best of my knowledge the GMD was the first of GM series and the D stood for Direct, as in cooling, but I will stand corrected. There are many thousands of these engines still giving reliable service in saltwater with regular Anode attention. You will have to change your thermostat to 145f for salt water if a fitted with a hotter type, then it will be still going strong when most of use have gone.

shakey doug is offline   Reply With Quote
Old 04-10-2015, 19:35   #3
Registered User

Join Date: Nov 2010
Posts: 4
Re: Yanmar 3gmd conversion to fresh water

I have a Yanmar 3GM on my Freedom 33 and it was converted to freshwater cooling. ItS really quite simple. You can get an external heat exchanger which with a couple of brackets bolts on to the back of the engine using the two top housing to engine block bolts. an extra water pump also needs to be added. This pump is for the raw water and the original water pump">raw water pump runs the frsh water cooling circuit. . Also will need a new pulley available from yanmar with an extra space for the belt for the added pump. Then just run the appropriate hoses to the heat exchanger, 2 for the engine coolant and two for the raw water circuit of which on of these goes to the mixing elbow on the exhaust. My set up works great. If you want pictures , diagrams etc, just PM me and ill try to provide them for you, Rick
midnightsailor is offline   Reply With Quote
Old 05-10-2015, 02:34   #4
Certifiable Refitter/Senior Wannbe
Wotname's Avatar

Cruisers Forum Supporter

Join Date: Jan 2008
Location: South of 43 S, Australia
Boat: Van DeStat Super Dogger 31'
Posts: 6,324
Re: Yanmar 3gmd conversion to fresh water

Midnightsailor, I would interested in knowing how you dealt with the thermostat when you did your freshwater conversion.
All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find it was vanity: but the dreamers of the day are dangereous men, for they may act their dreams with open eyes, to make it possible. T.E. Lawrence
Wotname is offline   Reply With Quote
Old 07-10-2015, 20:54   #5
Registered User

Join Date: Nov 2010
Posts: 4
Re: Yanmar 3gmd conversion to fresh water

Not sure what your concern is, I just used teh same thermastat and housing that is use on the 3GM F(fresh water cooled) so I am now able to run with a higher operating temp than the raw water cooled engine did( I for get the exact temp but I believe it is about 180.degrees. let me know if this helps or if I can provide other information, regards,Rick
midnightsailor is offline   Reply With Quote

3gm, water, yanmar

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
SeaEra conversion kit - fresh water AND raw water enovillo Plumbing Systems and Fixtures 3 28-06-2014 15:17
For Sale: Yanmar 3GMD Parts DBCochrane Classifieds Archive 0 24-07-2012 14:55
Raw-water to fresh-water cooling conversion Catamount Engines and Propulsion Systems 31 06-05-2012 07:29
Troubleshooting Yanmar 3GMD Instruments. Duke 48 Engines and Propulsion Systems 2 12-03-2012 08:43
Yanmar 3GMD Cruising RPM ? sailstoo Monohull Sailboats 2 05-08-2010 12:37

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 16:53.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.