Yanmar 6LT640 Marine Inboard Diesel Engine 640hp
$60,888.00
- Description
Description
Yanmar 6LT640 Marine Inboard Diesel Engine 640HP
The Yanmar 6LT640 640HP marine inboard diesel engine delivers 470 kW / 640 MHP at 2,530 rpm from an 8.71-litre inline six-cylinder platform. Bosch common-rail fuel injection, turbocharging, intercooling and electronic controls combine in a propulsion engine for buyers assessing a motor-yacht installation or recreational marine repower. YANMAR Marine International
Looking for a Yanmar 6LT640 for sale? Contact MSS Motorsports UG for current availability, engine condition and package pricing. Request an engine-only quotation or specify the gearbox, helm controls and instrumentation required for your vessel.
Common-Rail Power and Electronic Control
The 6LT640 brings together features that support an integrated marine propulsion installation:
- Bosch common-rail injection: Electronically managed direct injection controls fuel delivery.
- Turbocharged and intercooled: Combines intake-air boost with charge-air cooling.
- Electronic vessel controls: Yanmar’s current model page lists VC20/VC30 control-system packages.
- 24V electrical system: Includes a manufacturer-listed 90A alternator.
- Heat-exchanger cooling: Uses engine coolant with seawater heat exchange. YANMAR Marine International
For owners moving from a mechanical engine, include the control system and wiring in the repower plan. Confirm how the proposed helm equipment will connect with the engine and transmission.
Technical Specifications
| Specification | Details |
|---|---|
| Manufacturer | Yanmar |
| Engine model | 6LT640 |
| Engine family | Yanmar 6LT Series |
| Rated output | 470 kW / 640 MHP |
| Rated engine speed | 2,530 rpm |
| Displacement | 8.710 litres |
| Configuration | Inline six-cylinder, four-stroke diesel |
| Bore × stroke | 117 × 135 mm |
| Fuel system | Direct injection, Bosch common rail |
| Aspiration | Turbocharged and intercooled |
| Engine controls | Electronic |
| Cooling | Coolant circuit with heat exchanger |
| Electrical system | 24V |
| Alternator | 24V / 90A |
| Published dry weight without gearbox | 1,125 kg |
Rating note: Yanmar publishes the horsepower figure as metric horsepower (MHP). Use the applicable operating manual and installation documentation when assessing the engine’s duty and propulsion requirements. YANMAR Marine International
Review the official Yanmar 6LT640 specifications for manufacturer reference information.
Applications and Operating Duty
Yanmar positions the 6LT family for inboard installations in planing and semi-planing boats. The 6LT640 operation manual specifies recreational use, making it an option to assess for motor yachts, fast leisure boats and suitable recreational repower projects.
Commercial buyers should confirm the required rating and certification before selecting an engine: Yanmar states that the 6LT640 is not EPA Commercial certified. yanmar.com
If a lower-output model better matches your project, compare the Yanmar 6LT580 marine inboard diesel engine.
ZF Gearboxes and Helm Integration
Yanmar’s operation manual identifies ZF305-3 and ZF305-3A marine gearboxes for the 6LT range. Its product documentation also lists angled, parallel and V-drive gearbox options. The appropriate transmission and reduction ratio depend on the vessel, shaft arrangement and propeller calculation.
Electronic control packages can include a CAN-bus control head, display, switch panel and backup panel. Confirm the exact VC20 or VC30 configuration, included harnesses and any additional helm stations in your quotation. yanmar.com
Installation planning should cover engine-bed loading, service clearances, cooling-water supply, exhaust routing and access for bringing the engine aboard. Use the drawing for the quoted engine and gearbox combination.
Engine Package, Condition and Warranty
An itemised Yanmar 6LT640 640HP price quotation should identify the engine’s condition, serial number and equipment supplied. Confirm inclusion of the gearbox, controls, display, harnesses, mounts, exhaust mixing elbow and installation accessories.
Request available inspection or test records, applicable commissioning requirements and written warranty terms. The offer should name the warranty provider and state the coverage period, exclusions and claim process.
Include packing, freight charges, estimated dispatch timing and delivery terms when comparing the complete supply cost.
Frequently Asked Questions
Does the Yanmar 6LT640 640HP use common-rail injection?
Yes. Yanmar specifies direct injection with a Bosch common-rail fuel system and electronic controls. YANMAR Marine International
Is a gearbox included with the engine?
Package contents must be confirmed in the quotation. Provide your preferred gearbox configuration and required reduction ratio.
Can I reuse my existing controls?
Compatibility requires assessment. Supply the existing control-system details so your installer can review the proposed engine, gearbox and helm arrangement.
Request Your Yanmar 6LT640 640HP Quote
Get a quotation matched to your vessel and installation plan. Request Yanmar 6LT640 pricing and availability from MSS Motorsports UG.
Include your boat make and model, existing engine and transmission, required gearbox ratio, preferred control package, how soon you intend to purchase, and billing and delivery addresses. Ask for an itemised offer covering equipment, applicable warranty, delivery costs and estimated dispatch timing.
