Repowering a 25D

[Ray Worthington]

As promised in my January 26th question about a 13 inch prop on a 25D, I said that once I finished with the repowering project I would post a full description and the results. Here it is.
In the May/June 2001 issue of Good Old Boat in John Vigor's article on the 25D, he quotes Mike Smith of Solitude as saying, "it's grossly underpowered . . . I'd like to replace it with a 12-horse, two cylinder diesel in a couple of years." That quotation got me to thinking that I would like to do the same thing to my 1982 25D, Halcyon, hull #30. After looking through numerous websites of diesel inboards for sale, I came upon a rebuilt Yanmar 2GMF (13 horsepower model) in Miami. Since I'm on St. Simons Island, Georgia, that's not a long way from me. I had my boat hauled out, the 1GM removed, took it to Miami, and traded it in with some money on the 2GMF. The engine came with a 3 blade 13 X 12 prop, which is the reason for my question of January 26th. By the way, the 13 inch prop fits and does not hit the rudder when the tiller is pushed hard over.
There were two somewhat major modifications that had to be made to the 25D to get the 2GM to fit properly. The first was to add three inches to the engine beds. This was accomplished by fashioning two hardwood blocks in the shape of the beds and bolting and glassing them to the front of the beds. The second modification was to rearrange the exhaust system, mostly by mounting the muffler to the back of the port engine bed. While all this was going on I had the mechanic install a Racor fuel filter and an engine hour counter. I did manage to pick the slowest mechanic on the east coast to do this job; it took him two months (not continuous) to get it done.
The results have been spectacular!!! The 2GM will push the boat at hull speed at 2400 rpms and at 6.3 at 2700 rpms. Best of all, here on the Georgia coast where the tides run six to nine feet, she'll go against the tidal current at 5 mph over land at 2500 rpms. The additional weight is negligible but I notice that the exhaust is slightly (about a 1/2 inch) more under water than before. In terms of fuel consumption, there has been a small increase; she burns about 1/8 of a tank in three hours at 2500 rpms.
While this was an expensive upgrade, I'd do it again. Over all the boat's performance under power is greatly improved. Email me with any questions. Happy sailing, Ray.



acw@thebest.net

[Clay Stalker]

As promised in my January 26th question about a 13 inch prop on a 25D, I said that once I finished with the repowering project I would post a full description and the results. Here it is.
In the May/June 2001 issue of Good Old Boat in John Vigor's article on the 25D, he quotes Mike Smith of Solitude as saying, "it's grossly underpowered . . . I'd like to replace it with a 12-horse, two cylinder diesel in a couple of years." That quotation got me to thinking that I would like to do the same thing to my 1982 25D, Halcyon, hull #30. After looking through numerous websites of diesel inboards for sale, I came upon a rebuilt Yanmar 2GMF (13 horsepower model) in Miami. Since I'm on St. Simons Island, Georgia, that's not a long way from me. I had my boat hauled out, the 1GM removed, took it to Miami, and traded it in with some money on the 2GMF. The engine came with a 3 blade 13 X 12 prop, which is the reason for my question of January 26th. By the way, the 13 inch prop fits and does not hit the rudder when the tiller is pushed hard over.
There were two somewhat major modifications that had to be made to the 25D to get the 2GM to fit properly. The first was to add three inches to the engine beds. This was accomplished by fashioning two hardwood blocks in the shape of the beds and bolting and glassing them to the front of the beds. The second modification was to rearrange the exhaust system, mostly by mounting the muffler to the back of the port engine bed. While all this was going on I had the mechanic install a Racor fuel filter and an engine hour counter. I did manage to pick the slowest mechanic on the east coast to do this job; it took him two months (not continuous) to get it done.
The results have been spectacular!!! The 2GM will push the boat at hull speed at 2400 rpms and at 6.3 at 2700 rpms. Best of all, here on the Georgia coast where the tides run six to nine feet, she'll go against the tidal current at 5 mph over land at 2500 rpms. The additional weight is negligible but I notice that the exhaust is slightly (about a 1/2 inch) more under water than before. In terms of fuel consumption, there has been a small increase; she burns about 1/8 of a tank in three hours at 2500 rpms.
While this was an expensive upgrade, I'd do it again. Over all the boat's performance under power is greatly improved. Email me with any questions. Happy sailing, Ray.

Ray:

I have that same engine in my 1982 CD27 and it runs real well....plenty of power in all situations. Best of luck with it!

Clay Stalker



cstalker@cheshire.net

[Bob Ohler]

Just curious... What changes, if any, have you realized going in reverse? I thought my 25D (Yanmar 1GM) was the greatest boat ever made, but backing up she behaved like a "drunken elephant." Spring lines was the only way that I could make her behave going astern.
rbo

As promised in my January 26th question about a 13 inch prop on a 25D, I said that once I finished with the repowering project I would post a full description and the results. Here it is.
In the May/June 2001 issue of Good Old Boat in John Vigor's article on the 25D, he quotes Mike Smith of Solitude as saying, "it's grossly underpowered . . . I'd like to replace it with a 12-horse, two cylinder diesel in a couple of years." That quotation got me to thinking that I would like to do the same thing to my 1982 25D, Halcyon, hull #30. After looking through numerous websites of diesel inboards for sale, I came upon a rebuilt Yanmar 2GMF (13 horsepower model) in Miami. Since I'm on St. Simons Island, Georgia, that's not a long way from me. I had my boat hauled out, the 1GM removed, took it to Miami, and traded it in with some money on the 2GMF. The engine came with a 3 blade 13 X 12 prop, which is the reason for my question of January 26th. By the way, the 13 inch prop fits and does not hit the rudder when the tiller is pushed hard over.
There were two somewhat major modifications that had to be made to the 25D to get the 2GM to fit properly. The first was to add three inches to the engine beds. This was accomplished by fashioning two hardwood blocks in the shape of the beds and bolting and glassing them to the front of the beds. The second modification was to rearrange the exhaust system, mostly by mounting the muffler to the back of the port engine bed. While all this was going on I had the mechanic install a Racor fuel filter and an engine hour counter. I did manage to pick the slowest mechanic on the east coast to do this job; it took him two months (not continuous) to get it done.
The results have been spectacular!!! The 2GM will push the boat at hull speed at 2400 rpms and at 6.3 at 2700 rpms. Best of all, here on the Georgia coast where the tides run six to nine feet, she'll go against the tidal current at 5 mph over land at 2500 rpms. The additional weight is negligible but I notice that the exhaust is slightly (about a 1/2 inch) more under water than before. In terms of fuel consumption, there has been a small increase; she burns about 1/8 of a tank in three hours at 2500 rpms.
While this was an expensive upgrade, I'd do it again. Over all the boat's performance under power is greatly improved. Email me with any questions. Happy sailing, Ray.

Ray:

I have that same engine in my 1982 CD27 and it runs real well....plenty of power in all situations. Best of luck with it!

Clay Stalker

[Ray Worthington]

Just curious... What changes, if any, have you realized going in reverse? I thought my 25D (Yanmar 1GM) was the greatest boat ever made, but backing up she behaved like a "drunken elephant." Spring lines was the only way that I could make her behave going astern.
rbo

Bob: I regret to tell you that while there is definitely more power underway in reverse, it's still anyone's guess where she's going. I too had hoped for better steerage in reverse. Ray

As promised in my January 26th question about a 13 inch prop on a 25D, I said that once I finished with the repowering project I would post a full description and the results. Here it is.
In the May/June 2001 issue of Good Old Boat in John Vigor's article on the 25D, he quotes Mike Smith of Solitude as saying, "it's grossly underpowered . . . I'd like to replace it with a 12-horse, two cylinder diesel in a couple of years." That quotation got me to thinking that I would like to do the same thing to my 1982 25D, Halcyon, hull #30. After looking through numerous websites of diesel inboards for sale, I came upon a rebuilt Yanmar 2GMF (13 horsepower model) in Miami. Since I'm on St. Simons Island, Georgia, that's not a long way from me. I had my boat hauled out, the 1GM removed, took it to Miami, and traded it in with some money on the 2GMF. The engine came with a 3 blade 13 X 12 prop, which is the reason for my question of January 26th. By the way, the 13 inch prop fits and does not hit the rudder when the tiller is pushed hard over.
There were two somewhat major modifications that had to be made to the 25D to get the 2GM to fit properly. The first was to add three inches to the engine beds. This was accomplished by fashioning two hardwood blocks in the shape of the beds and bolting and glassing them to the front of the beds. The second modification was to rearrange the exhaust system, mostly by mounting the muffler to the back of the port engine bed. While all this was going on I had the mechanic install a Racor fuel filter and an engine hour counter. I did manage to pick the slowest mechanic on the east coast to do this job; it took him two months (not continuous) to get it done.
The results have been spectacular!!! The 2GM will push the boat at hull speed at 2400 rpms and at 6.3 at 2700 rpms. Best of all, here on the Georgia coast where the tides run six to nine feet, she'll go against the tidal current at 5 mph over land at 2500 rpms. The additional weight is negligible but I notice that the exhaust is slightly (about a 1/2 inch) more under water than before. In terms of fuel consumption, there has been a small increase; she burns about 1/8 of a tank in three hours at 2500 rpms.
While this was an expensive upgrade, I'd do it again. Over all the boat's performance under power is greatly improved. Email me with any questions. Happy sailing, Ray.

Ray:

I have that same engine in my 1982 CD27 and it runs real well....plenty of power in all situations. Best of luck with it!

Clay Stalker

acw@thebest.net

[Ken Cave]

This is not the engine's fault, but the fault of the full keel itself!

In my CD 28 (repowered with a Volvo 2020 made by Perkins with a Japanese block) I find it a just a little easier to back up as I have more power and am able to increase the rpm's faster.

Just another challenge that we look foward to in sailing!!

Ken Cave
Dragon Tale
CD28#227
Anacortes, CA



bcave@whidbey.net