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 Catalina/Capri 25/250 Sailor's Forums
 Catalina 250 Specific Forum
 Yanmar 9hp Diesel		  New Topic  Topic Locked
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WK 727
1st Mate

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USA
72 Posts
Initially Posted - 06/30/2018 :  15:07:55  Show Profile
Below is a recap of the diesel option on the 250 wing keel.

The Yanmar 9hp is a single cylinder engine without a heat exchanger for cooling the engine. The output is facing forward and is mated to the Saildrive SD20. The portion below the hull looks and operates like an outboard lower unit.

Specifications from the Yanmar and sail drive manuals:
Engine model - 1GM10C
Output speed - 3,400 rpm
Compression ratio - 23:1
Cooling system - direct seawater cooling (rubber impeller water pump)
AC generator - 12V, 35A
Dimensions (L x W x H ) - 21.81" x 16.14" x 19.09"
Weight - 167 lbs

Saildrive - SD20
Reduction gear system - constant mesh gear with dog clutch
Direction 0f rotation - counterclockwise viewed from stern
Reduction ratio - 2.64 (ahead and astern)
Weight - 66 lbs

Fuel tank - aluminum factory tank
Capacity - 17 gallons
Dimensions (L x W x H) - 27.5" x 21" x 10"
Weight - 30 lbs
Range - 2,400 rpm, 3.5knots, 0.2 gal/hr ~ 300 nautical miles
Range - 3,400 rpm, 5.5knots, 0.43 gal/hr ~ 220 nautical miles
Regards, John
Westlawn Institute graduate
Yacht Design and Naval Architecture
04 Catalina 250 WK
Standard rig w/wheel steering
Yanmar 9hp diesel

zeil
Master Marine Consultant

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Canada
1297 Posts
Response Posted - 06/30/2018 :  17:50:46  Show Profile

Great dependable, lightweight, compact little diesel with a wonderful range. Like the sail-drive arrangement... first I've ever seen in a C250W Your boat would be very maneuverable and great in tight spots
Is raw seawater cooling the engine. Is there anyway to flush?
Henk & Johanna
"Floating", a few off your "barnacles".
"Someday Lady" '95 C250WB #151 ('03 - 2016)
"Sea ya" 30ft Bayliner (04-2018 - 09-2018)
"Mariah" '96 C250WB #191 (05-2019 - 15-05-2023)
"Lady J" '00 C250WK #499 (05-2021 - 09-2022)
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WK 727
1st Mate

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USA
72 Posts
Response Posted - 07/07/2018 :  15:34:50  Show Profile
Henk, the sail drive looks like an outboard lower unit. When it is on the trailer, you use muffs to flush the engine, just like an outboard. Seawater is in the engine for cooling. Not exactly thrilled with the potential corrosion activity in the engine, but it is extremely simple.

Thanks, John
Regards, John
Westlawn Institute graduate
Yacht Design and Naval Architecture
04 Catalina 250 WK
Standard rig w/wheel steering
Yanmar 9hp diesel
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Russ.Johnson
Commodore

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USA
833 Posts
Response Posted - 07/08/2018 :  14:37:32  Show Profile
Thank you for posting the photos.
I've never seen one.
Do you have any photos when it's on the trailer?
Russ Johnson
2005 C250WB Hull 793
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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.