Yanmar 6AY650 Marine Inboard Diesel Engine 650hp

Description

Yanmar 6AY650 Marine Inboard Diesel Engine 650HP

Contact MSS Motorsports UG about the engine advertised as the Yanmar 6AY650 Listing HP marine inboard diesel engine. Request an itemised quotation covering the exact factory model, documented power rating, condition and equipment supplied for your vessel replacement or repower project.

Model identification: “6AY650” has not been verified as a Yanmar factory model designation in the manufacturer documentation reviewed. The engine nameplate and serial number should establish the full model code before specifications, operating duty or gearbox compatibility are confirmed.

Understanding the 650HP Figure

Yanmar publishes the 6AYM-WST at 485 kW / 659 MHP at 1,900 rpm. Converting 485 kW gives approximately 650 mechanical horsepower. Metric horsepower and mechanical horsepower use different units, so these figures can describe approximately the same power. yanmar.com

This numerical match does not establish that the advertised 6AY650 is a 6AYM-WST. Request the offered engine’s nameplate, applicable datasheet and rating documentation.

Manufacturer Reference: Yanmar 6AYM-WST

For buyers comparing equipment in this power range, Yanmar’s documented 6AYM-WST provides the following reference specifications:

Reference only: These specifications apply to the manufacturer-named 6AYM-WST. Apply them to the offered unit only after its identity and configuration have been confirmed. yanmar.com

Review the official Yanmar 6AYM-WST and 6AYM-WET brochure for manufacturer specifications and rating definitions.

Commercial Duty and Gearbox Selection

For an identified 6AYM-WST in C-rating, Yanmar’s current brochure describes a continuous-duty application without limits on annual operating hours, continuous running hours or load factor. That classification must be confirmed for the quoted engine. yanmar.com

Yanmar’s current 6AY specifications identify YX-181 and YX-180L hydraulic multi-disc marine gearboxes for the 6AYM-WST. Published ahead ratios include 2.08:1, 2.55:1 and 3.03:1 for the YX-181, and 3.50:1, 4.00:1 and 4.54:1 for the YX-180L. yanmar.com

Select the transmission and ratio using the vessel’s shaft arrangement, propeller calculation and operating requirements. Compare other Yanmar 6AY marine engine listings when discussing the required power and duty.

Define Your Supply Package

When requesting a Yanmar 6AY650 Listing price, specify engine-only supply or an engine-and-gearbox package. Ask the quotation to identify:

• Full factory model, serial number, rated output and duty classification.
• Engine condition, recorded hours and available inspection or service records.
• Gearbox, controls, instrument panel, wiring, mounts and exhaust equipment included.
• Applicable warranty provider, coverage period, exclusions and claim procedure.
• Packing, freight charges, estimated dispatch timing and delivery terms.

For a reconditioned engine, request supporting details of the work completed. Your installer should assess dimensions, package weight, engine-bed loading, shaft alignment, cooling, exhaust routing and service access using drawings for the identified equipment.

Frequently Asked Questions

Why might a 650HP listing relate to a 659 MHP engine?

The units differ. Yanmar 6AY650 Listing published 485 kW rating for the 6AYM-WST is approximately 650 mechanical horsepower, while the manufacturer lists it as 659 metric horsepower. Confirm both the model and measurement units in the quotation.

Is the listed 6AY650 confirmed as a 6AYM-WST?

No. That identification requires the offered engine’s nameplate and supporting documentation.

Is a marine gearbox included?

Confirm this in the written equipment list. Provide the required gearbox model, reduction ratio and rotation.

Request Engine Details and a Quotation

Contact MSS Motorsports UG about the Yanmar 6AY650 listing for factory model identification, supporting specifications, availability and package pricing.

Include your boat make and model, existing engine and gearbox, required power, intended operating duty, annual running hours, required reduction ratio, how soon you plan to purchase, and billing and delivery addresses.