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 Catalina/Capri 25/250 Sailor's Forums
 Catalina 250 Specific Forum
 C250 With Yanmar Diesel Sail-drive		  New Topic  Topic Locked
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JB
Navigator

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USA
113 Posts
Initially Posted - 09/22/2022 :  10:53:30  Show Profile
Anyone with a sail-drive, have you replaced the diaphragm? Did you do it yourself or pay to have it done? How much did you pay? Job seems doable with help but parts are expensive, labor even more so.
1988 C25 Wing Keel Std Rig Tohatsu 9.9 Tiller Steering and 2003 C250 Wing Keel Std Rig Inboard Diesel Wheel Steering
Edited by - JB on 09/27/2022 05:55:30

Voyager
Master Marine Consultant

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USA
5320 Posts
Response Posted - 09/24/2022 :  18:38:37  Show Profile
Hmmmm, not too many respondents on this thread. I reckon that most C250 folks must have an outboard.
How does your engine work, is it mounted inside a compartment underneath the cockpit sole, or does it encroach into the rear of the cabin?
Underneath the boat, is there a skeg that the sail drive is mounted into, that’s ahead of the rudder and behind the keel? Or is it somehow part of the keel?
Very curious about this.
Bruce Ross
Passage ~ SR-FK ~ C25 #5032

Port Captain — Milford, CT
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JB
Navigator

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USA
113 Posts
Response Posted - 09/25/2022 :  06:16:19  Show Profile
I know there are a few owners of them on this site. I may have to be patient.

The unit is between the rudder and the keel in a housing that forms part of the steps into the cabin.

https://www.yanmar.com/marine/product/drives/sd2
1988 C25 Wing Keel Std Rig Tohatsu 9.9 Tiller Steering and 2003 C250 Wing Keel Std Rig Inboard Diesel Wheel Steering
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Robb
1st Mate

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Canada
31 Posts
Response Posted - 09/25/2022 :  21:26:18  Show Profile
Hi JB. I have a 2004 250 WK with the Yanmar diesel and saildrive. Not sure what you are referring to re: Diaphragm. Do you mean the rubber diaphragm that goes around the saildrive at the top or the rubber gasket that attaches to the hull and seals around the bottom of the saildrive leg? I replaced the bottom one last year but haven't replaced the upper one as mine is still in good condition. The bottom one was shredded and was quite easy to install but....there are two different ones that look almost identical and depending on your serial # it could be one or the other. I was able to modify the incorrect one to fit but it took some shaving and cutting of the rubber, then installed with Sikaflex 290.
Robb
2004 C250 WK hull# 739
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JB
Navigator

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USA
113 Posts
Response Posted - 09/26/2022 :  07:10:00  Show Profile
Robb the kit includes the rubber piece that surrounds the drive and is glued to the hull and the two internal seals that keep the water out. The part of the kit I don't understand is how the steel bands work and if they need a special tool to apply them. Yanmar recommends inspection every two years and replacement at 5.
1988 C25 Wing Keel Std Rig Tohatsu 9.9 Tiller Steering and 2003 C250 Wing Keel Std Rig Inboard Diesel Wheel Steering
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JB
Navigator

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USA
113 Posts
Response Posted - 09/27/2022 :  05:59:18  Show Profile
Another question how fast can you go? I have a fixed two blade propeller 14 diameter 7 pitch and at 3350 RPM on flat water 5.5 miles per hour at best. Into wind 5 mph or less.
1988 C25 Wing Keel Std Rig Tohatsu 9.9 Tiller Steering and 2003 C250 Wing Keel Std Rig Inboard Diesel Wheel Steering
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Robb
1st Mate

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Canada
31 Posts
Response Posted - 10/04/2022 :  06:16:40  Show Profile
JB, let me have a look at the saildrive top gasket as thats the only one I'll be able to see. I had the same prop and upgraded to a folding prop last year. There wasnt any noticeable difference in speed between the two under power. I'll double check when I'm on the boat again, but if I remember correctly, at 2500 rpm (which is where I usually run the motor) I'm going around 4.5 knots.
Robb
2004 C250 WK hull# 739
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Robb
1st Mate

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Canada
31 Posts
Response Posted - 10/18/2022 :  21:39:57  Show Profile
Hi JB. I got out on my boat last Saturday. At full throttle (3350 RPM) the boat was going 5.9 knots with 4 adults on board in flat water. Pretty much maximum hull speed for this boat.
Robb
2004 C250 WK hull# 739
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JB
Navigator

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USA
113 Posts
Response Posted - 10/20/2022 :  06:47:16  Show Profile
Thanks for checking that out. It gives me some hope that my speed issue can be corrected. Either my transmission has a different ratio, which unlikely or I need a prop with a higher pitch.

By any chance would you know the pitch on your propeller?

quote:
Originally posted by Robb

Hi JB. I got out on my boat last Saturday. At full throttle (3350 RPM) the boat was going 5.9 knots with 4 adults on board in flat water. Pretty much maximum hull speed for this boat.
1988 C25 Wing Keel Std Rig Tohatsu 9.9 Tiller Steering and 2003 C250 Wing Keel Std Rig Inboard Diesel Wheel Steering
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Robb
1st Mate

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Canada
31 Posts
Response Posted - 10/21/2022 :  08:53:44  Show Profile
Yep, I replaced the stock 14 inch fixed blade prop with a Flex o fold 14x09 Left. so the pitch is 9.
Robb
2004 C250 WK hull# 739
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JB
Navigator

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USA
113 Posts
Response Posted - 10/23/2022 :  05:42:54  Show Profile
Thanks again. It looks like a new prop would get me a little over a knot in cruising speed.

quote:
Originally posted by Robb

Yep, I replaced the stock 14 inch fixed blade prop with a Flex o fold 14x09 Left. so the pitch is 9.
1988 C25 Wing Keel Std Rig Tohatsu 9.9 Tiller Steering and 2003 C250 Wing Keel Std Rig Inboard Diesel Wheel Steering
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Robb
1st Mate

Members Avatar

Canada
31 Posts
Response Posted - 11/27/2022 :  21:15:13  Show Profile
Not sure if its a full knot on not but anything that I gained from the folding prop is likely lost due to the bow thruster that was installed by the previous owner. When people see a 25' boat with a bow thruster its pretty much like a carnival side show. :)
Robb
2004 C250 WK hull# 739
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.