Yanmar 6LY3-UTP – Inboard Diesel Engine 380 HP

Helms requiring a 380 horsepower rating for medium planing hulls can rely on the Yanmar 6LY3-UTP. Built on a 5.813-liter inline 6-cylinder block, this electronic common-rail engine delivers steady propulsive thrust at 3300 RPM. Turbocharged and intercooled air management maximizes oxygen volume in combustion chambers, providing clean fuel burn and strong low-end torque for heavy cruising vessels.

Closed freshwater heat exchanger cooling keeps raw seawater out of internal engine waterways, preventing scale buildup. The mechanical package features an SAE 3 flywheel housing, a 12V 80-amp alternator, forced oil lubrication, and a dry weight of 640 kg (1411 lbs) without transmission.

Helm Use and Readability

Smooth mechanical balance and electronic fuel management define the operation of this Yanmar inboard engine. Forced pressure lubrication with an 18-liter oil capacity protects internal bearings, while a water-cooled manifold dampens exhaust sound.

Why Choose the Yanmar 6LY3-UTP Inboard Marine Engine

Boaters choose the 6LY3-UTP marine engine for its durable 5.813-liter inline 6-cylinder block and efficient 380 horsepower output. Its electronic common-rail system and intercooled turbocharging provide smooth acceleration without heavy exhaust smoke. Closed heat exchanger cooling and SAE 3 gear compatibility make it a reliable repower option.

Warranty and Support

Yanmar backs this engine with a 2-Year Limited Recreational Warranty covering major internal mechanical components against factory defects. offers pre-purchase technical guidance and freight shipping customer support. Prior to freight shipment, staff verify the crated engine package against the confirmed order details. Review the applicable warranty information on before completing your order.

Before Ordering the Yanmar 6LY3-UTP Inboard Marine Engine

Measure your engine compartment dimensions to ensure proper clearance around the heat exchanger and turbocharger. Confirm your hydraulic transmission gear ratio, shaft coupling bolt layout, and fuel supply line size before completing your order.