Yanmar YSM12 Marine Inboard Diesel Engine 12hp

DescriptionNew Yanmar YSM12 Marine Inboard Diesel Engine 12HP For SaleThe Yanmar YSM12 Marine Inboard Diesel Engine 12HP is a compact, single-cylinder propulsion system built for operators who value simplicity, reliability, and long-term durability over complexity. Designed for small sailboats, displacement hulls, and auxiliary propulsion, this engine delivers steady low-RPM performance and dependable operation in real marine conditions.If you are evaluating the current Yanmar YSM12 price, this model remains one of the most cost-effective small diesel engines available, offering minimal maintenance requirements and strong longevity due to its fully mechanical design.For buyers actively searching for a Yanmar YSM12 for sale, this engine continues to be a practical solution for repower projects and smaller vessels that require a compact footprint and straightforward installation.At Yanmar Marine Experts, we supply professionally sourced yanmar diesel motors for customers who prioritize reliability, ease of servicing, and proven performance across decades of use.Built on Yanmar’s classic YSM platform, this yanmar marine diesel engines configuration is engineered for steady cruising efficiency, making it ideal for sailboats operating at consistent speeds.Key Features of Yanmar YSM12 Marine Diesel Engine12HP maximum outputSingle-cylinder horizontal diesel configurationDirect injection fuel systemFully mechanical control systemSimple and serviceable designLow fuel consumption under loadStrong low-speed torqueCompact and lightweight constructionIntegrated gearbox systemProven durability across global fleetsThis engine is widely selected by operators looking for dependable yanmar engines marine for small sailing vessels.Gearbox Compatibility & Propulsion SetupThe Yanmar YSM12 Marine Inboard Diesel Engine 12HP is typically supplied with an integrated mechanical reversing gearbox, commonly featuring approximately a 2:1 reduction ratio for shaft-driven propulsion.This configuration is ideal for displacement hulls where efficient low-speed propulsion and propeller matching are critical.We assist in confirming propeller sizing and drivetrain compatibility to ensure optimal performance.Technical SpecificationsTechnical SpecificationValueEngine ModelYanmar YSM12Engine Type4-stroke water-cooled dieselMaximum Output12HPRated SpeedApprox. 3000 RPMConfigurationSingle-cylinder (horizontal)DisplacementApprox. 0.5 LFuel SystemDirect InjectionAspirationNaturally AspiratedCooling SystemRaw water coolingStarting SystemElectric StartGearboxIntegrated reversing gearEngine Oil CapacityApprox. 3.3 LGear Oil CapacityApprox. 0.7 LDrive TypeShaft driveRecommended ApplicationsSmall sailboats, auxiliary propulsionProduction EraLegacy model (out of production)The YSM12 is part of Yanmar’s early compact diesel lineup, recognized for its robust construction and long operational lifespan.Standard Package IncludesEngines are typically supplied as complete mechanical units and may include:Integrated gearboxControl panelWiring componentsMounting hardwareDocumentation (when available)Configuration may vary depending on whether the unit is used or reconditioned.Compliance & Practical AdvantageThe Yanmar YSM12 Marine Diesel Engine is valued for:Mechanical simplicityMinimal electronic dependencyEase of maintenance in remote locationsLong service life under consistent useWhile it does not meet modern emission standards, it remains highly practical for legacy vessels and cost-effective repower projects.Engine AvailabilityThis model is no longer in production and is typically available as used or reconditioned units through global sourcing channels. Availability depends on condition and configuration.Warranty CoverageWarranty terms vary depending on supply condition:Reconditioned engines may include limited warrantyUsed units may be supplied as-is or with short-term coverageWe assist with inspection, testing, and documentation before shipment.Global ShippingWe coordinate worldwide shipping with secure export packaging and full documentation. Delivery can be arranged under EXW, CIF, or CFR terms. Processing begins after confirmation, while timelines depend on sourcing and destination logistics.Frequently Asked QuestionsIs the Yanmar YSM12 still in production?No, it is a legacy engine and typically available as used or reconditioned.Does it come with a gearbox?Yes, most units include an integrated reversing gearbox.Is this engine suitable for modern vessels?It is best suited for small sailboats and older vessels requiring simple auxiliary power.Is it reliable?Yes, it is widely known for durability, though it produces more vibration than modern engines.How do I request pricing?Contact us for the latest Yanmar YSM12 price and availability.Request a QuoteContact Yanmar Marine Experts to request pricing and availability for your preferred Yanmar marine engine.To ensure accurate configuration before shipment, please provide:Vessel typeCurrent engine (if repower)Shaft and gearbox detailsDelivery locationPurchase timelineWe assist with sourcing, compatibility checks, and complete delivery coordination.