Yanmar 2Gm in CD27

[Jim Stull]

We are "gearing up" to replace the old 1GM in our CD27 with the 2GM.
If anyone has this engine in their '27 I would appreciate the width measurment of the opening behind the steps. I am measuring about 14.2" on my 1977 boat and this looks to be a bit shy.
We have the boat about totally gutted now and have the opportunity to make aditional mod's to improve access if anyone has any suggestions.
Thanks
Jim



jtstull@earthlink.net

[Bill Goldsmith]

My 1980 CD27 was repowered by a prior owner with a Yanmar 2GM20(F). I don't have the exact measurement handy right now (I'm at the computer not the boat), but do note that the innermost flange supporting the companionway steps was indeed widened to fit the engine. I'll try to get that measurement tonight and post it.

Once installed there is fairly good engine access. To get to the oil dipstick it is best to remove the bulkhead drawer and reach through. The transmission oil access is accessible reaching over the engine.

I have no idea how to improve access to the prop shaft flange/stuffing box. I even considered a cockpit access hatch but am shying away because the access from the cockpit sole wouldn't be that good on the 27--the shaft is a bit forward of the cockpit, and way down. I'm convinced I'll need an elf if I need to adjust the stuffing box.

Bill Goldsmith
CD27#173
Second Chance

. : If anyone has this engine in their '27 I would appreciate the width measurment of the opening behind the steps. I am measuring about 14.2" on my 1977 boat and this looks to be a bit shy.

We have the boat about totally gutted now and have the opportunity to make aditional mod's to improve access if anyone has any suggestions.
Thanks
Jim

goldy@bestweb.net

[Bob Padlowski]

Are you tackling this job yourself? I have been considering repowering my CD27 as well. What is the going rate for the 2GM20?
I'm sure that many here (myself included) would be very interested in following your progress- please keep us posted!

Thanks,

Bob

We are "gearing up" to replace the old 1GM in our CD27 with the 2GM.
If anyone has this engine in their '27 I would appreciate the width measurment of the opening behind the steps. I am measuring about 14.2" on my 1977 boat and this looks to be a bit shy.
We have the boat about totally gutted now and have the opportunity to make aditional mod's to improve access if anyone has any suggestions.
Thanks
Jim

rpadlowski@hotmail.com

[mike]

No answer to the quesiton but a question of my own. Why repower? We have a Pearson Triton (28.5', 8500#s, 8' beam, 4' draft). We power it with a 10 hp Farrymann. Only once was it pushing its limits. That was into a 25 knot wind (gusting well above that) with 4' waves. But even then, directly into the wind, it made 1.5 to 2 knots per hour. In more stable conditons, it easily pushes the boat at hull speed. If I were replacing I'd go for the 1GM, not the more expensive 2GM which would, it seems, be needlessly expensive. I'm not trying to rattle anyone's chain or create a big argument. I'm seriously in wondering why in a 27' CD (I assume displacement is similar to my Triton) go to the 2GM? Mike

If anyone has this engine in their '27 I would appreciate the width measurment of the opening behind the steps. I am measuring about 14.2" on my 1977 boat and this looks to be a bit shy.

We have the boat about totally gutted now and have the opportunity to make aditional mod's to improve access if anyone has any suggestions.
Thanks
Jim

innisfree@att.net

[Bill Goldsmith]

Not really sure why my prior owner repowered, but I suspect it had to do with the fact that he kept it in a marina located on the Shinnecock Canal on Long Island, NY. At high tide, there are tidal lock gates that open and allow water to flow from Peconic Bay to Shinnecock Bay at about 6 knots, with low bridges downstream. Maybe he wanted extra oomph to buck that. Or maybe he destroyed the old engine trying to buck the current. I will never know, as I bought thru a broker. In any case I do like the engine and feel that it is a good match for the 27. I've never actually been on a 27 with the original one lung, so I really don't have a good answer for the repower questions you raise.

In my case I was attracted to the boat primarily because the engine was new and secondarily that it had more power than the original equipment. Perhaps others who are planning a repower could shed light on the reasoning.

Bill

No answer to the quesiton but a question of my own. Why repower? We have a Pearson Triton (28.5', 8500#s, 8' beam, 4' draft). We power it with a 10 hp Farrymann. Only once was it pushing its limits. That was into a 25 knot wind (gusting well above that) with 4' waves. But even then, directly into the wind, it made 1.5 to 2 knots per hour. In more stable conditons, it easily pushes the boat at hull speed. If I were replacing I'd go for the 1GM, not the more expensive 2GM which would, it seems, be needlessly expensive. I'm not trying to rattle anyone's chain or create a big argument. I'm seriously in wondering why in a 27' CD (I assume displacement is similar to my Triton) go to the 2GM? Mike

If anyone has this engine in their '27 I would appreciate the width measurment of the opening behind the steps. I am measuring about 14.2" on my 1977 boat and this looks to be a bit shy.

We have the boat about totally gutted now and have the opportunity to make aditional mod's to improve access if anyone has any suggestions.
Thanks
Jim

goldy@bestweb.net

[Jeff Schmoyer]

Why repower?

Well, for starters, I think that it's worth it to some sailors to know we go outin 25 kt's or wind, or fight strong current and still be able to make more than 1.5 kt headway. For me, it's really driven by the fundamental lack of time I have to go sailing...

Beyond this, I can report that the original YSM8 is a very noisy and vibration prone engine. At idle, each piston stroke is felt like a percussive shot through my boat. It's also raw-water cooled, so it's fundamentally worrisome to contemplate spending $2000+ into a rebuild when the engine has opperated in salt water for 20 years.

QUESTION: does one have to modify the engine beds to fit the 2GM?

Jeff



Jeff.Schmoyer@iff.com

[Clay Stalker]

My question is a little different. I have a 1982 CD 27 with a Yanmar 2GM which has 13HP. I thought this was the original engine...nothing said by previous owner....engine runs well, but no hour meter, so I don't know how many hours...my question is, is this the original engine?? I ran into a gentleman named McGee in Bristol Harbor the other day who said the CD 27 never had a 2GM as original equipment, but I know others on this board have one...Any help with this would be greatly appreciated....Thanks.

Clay Stalker

We are "gearing up" to replace the old 1GM in our CD27 with the 2GM.
If anyone has this engine in their '27 I would appreciate the width measurment of the opening behind the steps. I am measuring about 14.2" on my 1977 boat and this looks to be a bit shy.
We have the boat about totally gutted now and have the opportunity to make aditional mod's to improve access if anyone has any suggestions.
Thanks
Jim

cstalker@cheshire.net

[Bob Padlowski]

No answer to the quesiton but a question of my own. Why repower?

Good point Mike, and I think I can answer it. You're right, for most situations the 8 hp my YSB8 provides is adequate. But try bucking a 5-knot current with 8 hp, as I've done in the East River in NYC. You'll be standing still at best, motoring backwards, at worst. Or trying to make a port of refuge against strong winds and current. The extra horsepower provides a fair margin of safety.

I'm keeping my YSB8 until she croaks, most likely. It's just that those Yanmars are so well-built, I may have quite a while to wait!

Those Tritons are great boats!

Bob Padlowski

S/V "Abigail"
CD 27



rpadlowski@hotmail.com