Yanmar 3YM30 – Marine Diesel Engine 29 HP

Description

Deliver 29 horsepower at 3200 RPM directly to your sailboat propeller shaft with the Yanmar 3YM30. This 3-cylinder naturally aspirated diesel motor relies on a 1.115-liter displacement block, providing reliable auxiliary propulsion for cruising sailboats and small workboats. Indirect fuel injection keeps mechanical noise down inside the cabin, while a mechanical cone clutch transmission gives you positive gear control when backing into a slip.

Keeping salt corrosion away from internal cylinder walls is handled by a closed freshwater cooling system with an integrated heat exchanger. The engine mounts on a standard SAE 5 flywheel housing, spinning a 12V 60-amp alternator to keep your house battery banks topped off. With a dry weight of 127 kg (280 lbs), it delivers solid mechanical power without dragging down the stern of your vessel.

Key Specifications of the Yanmar 3YM30 Inboard Marine Engine

• The 1.115-liter 3-cylinder diesel block generates 29 horsepower at 3200 RPM, giving auxiliary sailboats steady propulsive thrust in rough chop.
• Indirect fuel injection ensures smooth pre-combustion control, which drastically cuts engine noise and vibration throughout the main cabin while underway.
• Freshwater heat exchanger cooling isolates the cylinder block from raw seawater, preventing salt buildup and extending internal metal service life.
• An integrated 12V 60-amp alternator delivers continuous battery charging current to support navigation electronics and onboard DC house loads.
• Engine coupling relies on an SAE 5 flywheel housing that connects smoothly to KM2P-1 mechanical transmissions or SD20 saildrives.
• A lightweight 127 kg dry weight rating preserves hull trim, keeping stern draft light for efficient sailing performance under canvas.

Engine Performance and Engineering

Smooth power delivery and low noise make this Yanmar inboard engine a favorite among sailboat owners. Forced lubrication with a trochoid pump circulates oil continuously, protecting crank bearings under heavy loads. The wet mixing elbow dampens exhaust pulses before water leaves through the transom.

Why Choose the Yanmar 3YM30 Inboard Marine Engine

Sailboat owners pick the 3YM30 marine engine for its lightweight 1.115-liter block and dependable 29 horsepower output. Its closed heat exchanger cooling protects internal waterways from salt corrosion, while the mechanical cone clutch provides crisp shifting. Compatibility with both shaft transmissions and saildrives makes this model an easy repower choice.

Installation and Repower Considerations

When dropping this unit onto engine bed stringers, double check shaft alignment to prevent cutless bearing wear. Ensure your raw water intake sea cock provides adequate flow to the heat exchanger, and verify that the exhaust elbow sits well above the loaded waterline to prevent siphoning.

Warranty and Support

Yanmar backs this engine with a 2-Year Limited Recreational Warranty covering major engine block assembly components against defects. Mulmarine.com provides product-information support before purchase and assistance with order-related questions. Prior to freight shipment, staff verify the crated engine package against the confirmed order details. Review warranty eligibility and current coverage details on Mulmarine.com before placing your order.

Before Ordering the Yanmar 3YM30 Inboard Marine Engine

Measure your engine room compartment height and stringer width to ensure the SAE 5 housing and oil dipstick clear all bulkheads. Confirm your propeller shaft diameter, coupling bolt pattern, or saildrive hull cutout dimensions match this engine configuration before placing your order.