Yanmar 1GM10 – Marine Diesel Engine 9 HP

Description

Vessels requiring a compact single-cylinder diesel motor for small sailboat auxiliary power can utilize the Yanmar 1GM10. Generating 9 horsepower at 3600 RPM from a 0.318-liter displacement block, this tiny engine fits into tight engine bilges where larger multi-cylinder units cannot go. Direct fuel injection delivers quick starting and efficient fuel burn, making it a classic choice for pocket cruisers and day-sailers.

Direct raw seawater cooling keeps the overall engine weight down to just 76 kg (168 lbs), avoiding the bulk of an external heat exchanger. It comes equipped with a 12V 35-amp alternator, a KM2P mechanical cone clutch transmission, and a wet exhaust mixing elbow that simplifies small boat repower projects.

Key Specifications of the Yanmar 1GM10 Inboard Marine Engine

• The 0.318-liter single-cylinder engine block generates 9 horsepower at 3600 RPM, giving small displacement hulls lightweight auxiliary propulsion.
• Direct fuel injection optimizes fuel atomization inside the combustion chamber, ensuring prompt cold starts and low overall fuel consumption.
• Direct seawater cooling removes the need for freshwater heat exchangers, reducing mechanical complexity and keeping dry weight extremely low.
• An integrated 12V 35-amp alternator supplies reliable charging current to keep engine start batteries and basic cockpit electronics powered up.
• Mechanical cone clutch shifting through the KM2P transmission provides direct gear engagement with minimal power loss to the shaft.
• An ultra-light dry weight of 76 kg prevents stern sagging, preserving proper hull balance on small sailing vessels.

Engine Performance and Engineering

Simple mechanical design keeps this Yanmar inboard engine running dependably in harsh bilge conditions. A trochoid oil pump provides forced lubrication to crank bearings, while the vertical single-cylinder layout takes up very little floor space inside narrow engine compartments.

Why Choose the Yanmar 1GM10 Inboard Marine Engine

Boaters select the 1GM10 marine engine when bilge space is tight and every pound matters. Delivering 9 horsepower from a 0.318-liter single-cylinder block, it provides dependable auxiliary power without adding heavy machinery to small hulls. Direct seawater cooling and a compact KM2P mechanical transmission make it a straightforward repower solution.

Installation and Repower Considerations

Aligning the propeller shaft carefully on flexible mounts is critical for reducing single-cylinder engine vibration. Make sure your raw water sea strainer is clean, and check that the wet exhaust loop sits high enough above the waterline to prevent flooding.

Warranty and Support

Yanmar protects this engine with a 2-Year Limited Recreational Warranty covering manufacturing defects on major mechanical assemblies. Mulmarine.com can assist with technical product details and freight delivery questions before purchase. The engine order is verified for visible package and documented accessory completeness before freight dispatch. Please review the warranty coverage and eligibility details on Mulmarine.com before purchase.

Before Ordering the Yanmar 1GM10 Inboard Marine Engine

Measure your engine compartment dimensions to confirm height and width clearance for a single-cylinder block. Check your propeller shaft diameter, transmission coupling bolt layout, and raw water intake hose size to ensure a smooth drop-in repower installation.