The Yanmar 6AY Series is a high-output commercial marine diesel engine range developed for vessels requiring dependable propulsion and substantial low-speed torque. Its six-cylinder, 20.379-litre engine platform uses direct fuel injection, turbocharging and intercooling. The range is suited to demanding applications such as workboats, fishing vessels, aquaculture-support craft, inland cargo vessels and pusher tugs when correctly matched to the required operating duty.
The series includes the Yanmar 6AYM-WST, rated at 485 kW (659 MHP), and the Yanmar 6AYAM-ET, rated at 555 kW (755 MHP). The Yanmar 6AYM-WET is offered at 555 kW (755 MHP) or 610 kW (829 MHP), depending on its rating, while the Yanmar 6AYM-WGT produces 670 kW (911 MHP). These model variations allow operators to select an engine according to vessel performance, annual operating hours and the applicable commercial-duty classification.
Selecting the correct Yanmar 6AY marine engine requires more than comparing maximum horsepower. Buyers should assess vessel displacement, hull design, propeller demand, cruising speed, expected annual operating hours and the engine’s C, M or L rating. Cooling configuration must also be confirmed because the 6AYAM-ET is published with keel cooling and an optional heat exchanger, while other 6AY models use heat-exchanger cooling.
A Yanmar 6AY engine and gearbox package may include a Yanmar hydraulic multi-disc marine transmission with model-specific reduction ratios. Available arrangements include the YXH-240 for applicable 6AYAM-ET, 6AYM-WET and 6AYM-WGT engines, while the 6AYM-WST can be paired with YX-181 or YX-180L gearboxes. The selected gear model, reduction ratio, shaft rotation, cooling arrangement, controls and installation accessories must be confirmed for the vessel before ordering.
When requesting a Yanmar 6AY engine for sale, provide the vessel type, operating profile, annual running hours, required power, current engine and gearbox, reduction ratio, propeller details, cooling arrangement, installation dimensions and delivery destination. The quotation should confirm the exact model, duty rating, rated output, engine condition, marine gear, included components, emissions certification, warranty, availability, lead time, packing method and delivery terms.
