The Yanmar 1GM from my CD25D ( 1983 - hull no. 98) is sitting on the workbench. It came out of the boat today for what will be a healing session. After removing the cylinder head it is apparent that 19-years of raw (salt) water cooling has not been kind to the engine. Help. Has anybody out there converted a 1GM to fresh water cooling?
kurt.thompson@gte.net
Fresh water cooling for Yanmar 1GM
Moderator: Jim Walsh
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Robert Pierce
Re: Fresh water cooling for Yanmar 1GM
My 1GM was converted to Fresh water by the previous owner. I can not provide a whole lot of information on it other than it works well. The down side to it is that you need engine coolant which make's changing impellers and engine zinc a pain as you need to properly dispose the coolant.
I do not know where you are located but if the timing is convenient you can take a look at the set up.
I am located in Fall River MA. Borden Light Marina.
Robert
Robert-Pierce@attbi.com
I do not know where you are located but if the timing is convenient you can take a look at the set up.
I am located in Fall River MA. Borden Light Marina.
Robert
Kurt Thompson wrote: The Yanmar 1GM from my CD25D ( 1983 - hull no. 98) is sitting on the workbench. It came out of the boat today for what will be a healing session. After removing the cylinder head it is apparent that 19-years of raw (salt) water cooling has not been kind to the engine. Help. Has anybody out there converted a 1GM to fresh water cooling?
Robert-Pierce@attbi.com
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Lou Ostendorff
How many hours on the engine?
Hello Kurt;
Well, it sounds like you've got a project...BTW, I was wondering, what with all the outrageous claims of a diesel's longevity, how many hours are on your 'mill? And do you know if the zincs were changed regularly? I've checked into freshwater cooling for the 1GM10, but Yanmar doesn't supply it...must be from an aftermarket outfit. I guess it would be nice to know, if the engines are going to last for 20 years with 8,0000-10,000 reliable hours, maybe after that it's time for a replacement...
Lou Ostendorff
CD25D Karma
"Navigare est necesse, Vivre non est necesse"
louosten@ipass.net
Well, it sounds like you've got a project...BTW, I was wondering, what with all the outrageous claims of a diesel's longevity, how many hours are on your 'mill? And do you know if the zincs were changed regularly? I've checked into freshwater cooling for the 1GM10, but Yanmar doesn't supply it...must be from an aftermarket outfit. I guess it would be nice to know, if the engines are going to last for 20 years with 8,0000-10,000 reliable hours, maybe after that it's time for a replacement...
Lou Ostendorff
CD25D Karma
"Navigare est necesse, Vivre non est necesse"
louosten@ipass.net
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Bruce Barber
Re: Fresh water cooling for Yanmar 1GM
Kurt,
As an alternative, you might consider just flushing with fresh water each time you tie up, presuming you have access to same. Install a simple tee connection where you can introduce fresh water (my setup uses gravity feed from a bucket) after closing the cooling seacock, keeping the engine running as you reposition the valve handles. I use nothing elaborate, in fact the "heart" of the system is a bronze garden valve from Home Depot. My 25D is #77, and the engine passages are probably not in the best of shape, since I began doing this only about three years ago, but I'm convinced I've at least slowed down the deterioration process. And yes, check the zinc each year.
Bruce Barber
25D Nancy Dawson
Shady Side, MD
bruce.barber@att.net
As an alternative, you might consider just flushing with fresh water each time you tie up, presuming you have access to same. Install a simple tee connection where you can introduce fresh water (my setup uses gravity feed from a bucket) after closing the cooling seacock, keeping the engine running as you reposition the valve handles. I use nothing elaborate, in fact the "heart" of the system is a bronze garden valve from Home Depot. My 25D is #77, and the engine passages are probably not in the best of shape, since I began doing this only about three years ago, but I'm convinced I've at least slowed down the deterioration process. And yes, check the zinc each year.
Bruce Barber
25D Nancy Dawson
Shady Side, MD
Kurt Thompson wrote: The Yanmar 1GM from my CD25D ( 1983 - hull no. 98) is sitting on the workbench. It came out of the boat today for what will be a healing session. After removing the cylinder head it is apparent that 19-years of raw (salt) water cooling has not been kind to the engine. Help. Has anybody out there converted a 1GM to fresh water cooling?
bruce.barber@att.net
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Bob Dugan
Re: Fresh water cooling for Yanmar 1GM
Kurt,
I have hull #92, we're practicaly related!
I'm very curious about how this healing is going to go. I took the Mack-Boring course on diesel engines and the instructor was a wealth of knowledge. One of the things that he said was that all the GM models were designed specifically to be raw water cooled. Fresh water cooling is something that was added as an afterthought to larger GMs to allow people to use heated water.
bdugan@stepzero.com
I have hull #92, we're practicaly related!
I'm very curious about how this healing is going to go. I took the Mack-Boring course on diesel engines and the instructor was a wealth of knowledge. One of the things that he said was that all the GM models were designed specifically to be raw water cooled. Fresh water cooling is something that was added as an afterthought to larger GMs to allow people to use heated water.
bdugan@stepzero.com