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The Yanmar 1GM10 9HP inboard diesel engine is a compact marine diesel designed for small sailboats and other suitable pleasure-craft applications. Yanmar specifies 6.6 kW / 9 mhp at 3,600 rpm from a single-cylinder, 0.318-liter engine with natural aspiration and indirect fuel injection. The 1GM10 uses mechanical engine controls and a direct seawater cooling system, making it a straightforward propulsion option for vessels where compact dimensions and a simple mechanical configuration are important.
Performance Engines offers this Yanmar 1GM10 as a new marine diesel engine. Before ordering, buyers should confirm the required marine gear or saildrive, mounting arrangement, engine-room dimensions, exhaust configuration and control setup for the specific vessel.
The Yanmar 1GM10 produces a rated output of 6.6 kW / 9 mhp at 3,600 rpm. Yanmar’s technical documentation also distinguishes between continuous and maximum ratings: an earlier operation manual lists a continuous crankshaft rating of 5.9 kW / 8 hp metric at 3,400 rpm and a maximum rating of approximately 6.7 kW / 9.1 hp metric at 3,600 rpm under the specified test conditions.
For purchasing and installation purposes, Yanmar’s current product page identifies the 1GM10 as a 9 mhp engine. Actual vessel speed and propulsion performance depend on hull design, displacement, propeller, marine gear or saildrive, loading and operating conditions.
The 1GM10 uses a 0.318-liter single-cylinder diesel engine with a 75 mm bore and 72 mm stroke. Its compact cylinder configuration keeps the engine physically small while providing mechanical diesel propulsion for appropriate small craft.
The engine is a four-stroke, vertical marine diesel. Yanmar identifies the GM series as using a swirl pre-combustion chamber, while the current 1GM10 product specification describes the combustion system as indirect injection with an in-line pump. The engine is naturally aspirated rather than turbocharged.
The Yanmar 1GM10 uses indirect fuel injection and an in-line injection pump. The engine-management system is mechanical, and Yanmar lists mechanical controls for the current product configuration.
This configuration can be useful when evaluating a replacement engine for an older mechanically controlled marine installation. Even so, the existing throttle, stop control, fuel system and engine mounts should be checked against the replacement engine before installation.
The 1GM10 uses a direct seawater cooling system with a rubber-impeller seawater pump. Unlike larger Yanmar models that use a separate fresh-water circuit and heat exchanger, the 1GM10’s cooling architecture is designed around direct seawater circulation.
Installation should include the correct seawater intake, hoses, pump arrangement, exhaust mixing components and seacock configuration. Follow Yanmar’s installation and operation documentation for cooling-water routing and maintenance requirements.
The 1GM10 uses a 12V electrical system and Yanmar specifies a 12V 40A alternator. The manufacturer’s technical datasheet also identifies electric starting at 12V with a 1.0 kW starter and manual-start provisions in the documented configuration.
When repowering a boat, verify the existing battery capacity, starter wiring, charging circuit, grounding and panel arrangement. The engine’s 40A alternator output should also be considered when planning the vessel’s electrical loads and battery-charging requirements.
| Specification | Yanmar 1GM10 |
|---|---|
| Engine type | 4-stroke, vertical, water-cooled marine diesel |
| Rated output | 6.6 kW / 9 mhp |
| Rated engine speed | 3,600 rpm |
| Continuous rating in Yanmar operation documentation | 5.9 kW / 8 hp metric at 3,400 rpm |
| Displacement | 0.318 L / 19.41 cu. in. |
| Cylinders | 1 cylinder |
| Bore × stroke | 75 × 72 mm / 2.95 × 2.83 in. |
| Combustion system | Indirect injection, in-line pump |
| Aspiration | Naturally aspirated |
| Cooling | Direct seawater cooling |
| Alternator | 12V – 40A |
| Controls | Mechanical |
| Dry weight without gear | 71 kg / 156.5 lb |
| Dimensions | 554 × 410 × 485 mm |
| Flywheel housing | SAE #6 |
| Certifications | RCD 2, EPA Tier 2, BSO II, EMC |
Yanmar’s current 1GM10 information identifies the engine with a marine gear or saildrive unit. The standard dimensional information uses the KM2P-1 marine gear, and Yanmar lists the SD25 saildrive among compatible drive products.
The published engine length includes the KM2P-1 marine gear in the specified configuration. Dimensions can change when a different gear, saildrive or exhaust elbow is selected, so buyers should use the exact installation drawing for the configuration being ordered rather than relying only on the bare-engine dimensions.
The bare 1GM10 is listed at 554 mm long × 410 mm wide × 485 mm high and weighs 71 kg without the marine gear. This compact format makes physical fitment an important part of a repower assessment.
Before replacing an existing engine, measure the available engine-bay length, width and height and check access for installation and maintenance. Also compare mounting positions, shaft alignment, exhaust routing, fuel connections, seawater plumbing and control cables.
Yanmar’s standard 1GM10 engine package includes an L-type exhaust mixing elbow, 12V 40A alternator, A panel and flexible mounts. The exact supplied configuration should be confirmed with the seller before ordering because equipment can vary according to the selected propulsion arrangement.
Yanmar lists several accessories for the 1GM10, including a B20 panel, 3-meter extension wire harness, TFX sidemount control head, SD25 propeller cone nut kit and onboard spare-parts kit. Selecting accessories should be based on the actual vessel control layout and the selected marine gear or saildrive.
Yanmar describes the 1GM10 as an engine designed for pleasure craft. Its compact single-cylinder format and 9 mhp output make it appropriate to consider for small sailboats and other light marine applications where the required propulsion power falls within the vessel manufacturer’s specifications.
Propulsion suitability should always be confirmed against the boat’s displacement, hull design, propeller, existing shaft or saildrive, and maximum permitted engine power. A 9HP rating by itself does not establish the correct engine for every small boat.
If the 1GM10 is being considered as a replacement for an existing marine diesel, compare more than horsepower. Check the original engine’s mounting footprint, shaft centerline, transmission ratio, propeller, exhaust system, cooling-water intake, fuel connections, electrical wiring and control arrangement.
The selected marine gear also affects the overall installation dimensions. Yanmar specifically notes that the published length includes the KM2P-1 gear and that dimensions can vary with other gears or exhaust elbows. Confirm the final dimensional drawing before committing to an engine-bay modification.
The Yanmar 1GM10 provides a simple 9 mhp marine diesel package in a compact single-cylinder format. Its naturally aspirated design, indirect injection, mechanical controls, direct seawater cooling and 12V 40A electrical system make its configuration notably straightforward compared with larger electronically managed common-rail marine engines.
For a new installation or repower, the key considerations are correct propulsion sizing, gear or saildrive selection, physical fit, shaft or drive compatibility, cooling and exhaust installation, and the vessel’s electrical and control requirements.
The current Yanmar specification lists the 1GM10 at 6.6 kW / 9 mhp at 3,600 rpm. Yanmar’s operation documentation also provides separate continuous and maximum output ratings.
Yes. The 1GM10 is naturally aspirated; it does not use a turbocharger or intercooler.
The 1GM10 is a single-cylinder four-stroke diesel with 0.318 liters of displacement.
The engine uses indirect injection with an in-line injection pump. Yanmar’s GM-series documentation describes its combustion arrangement as a swirl pre-combustion chamber.
Yanmar lists the dry weight at 71 kg / 156.5 lb without gear. The complete installed propulsion package will weigh more once the selected marine gear or saildrive and associated components are included.
No. Yanmar specifies direct seawater cooling for the 1GM10, using a rubber-impeller seawater pump.
Yanmar’s current information documents the engine with the KM2P-1 marine gear and identifies the SD25 as a compatible saildrive. Confirm the exact gear or drive configuration before ordering.
The current Yanmar specification lists a 12V 40A alternator. The engine’s electrical system should be evaluated together with the vessel’s battery, starter and charging requirements.
If you are looking for a compact Yanmar diesel for a small-boat repower or new marine installation, the 1GM10 provides a 9 mhp naturally aspirated configuration with mechanical controls and a compact footprint. Before purchase, confirm the vessel’s propulsion requirements and the exact marine gear or saildrive configuration needed for the installation.
For buyers comparing Yanmar marine diesel options, Performance Engines also offers other Yanmar inboard engines across different power classes, including the Yanmar 2YM15 14HP inboard diesel engine, Yanmar 3YM20 21HP inboard diesel engine, and Yanmar 4JH110 110HP inboard diesel engine.
Explore more inboard engines at Performance Engines.
