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The 12.5L six-cylinder engine is offered as either a propulsion or gen drive engine in either keel cooled or heat exchanger configurations. The engines are either turbocharged, non-aftercooled, turbocharged with jacket water aftercooling or turbocharged with sea water aftercooling. The propulsion engines feature constant power to 400 rpm below rated speed, making these engines an excellent choice for launches, work boats, trawler yachts, and patrol craft.
Watercooled Turbocharger and Exhaust Manifold
- Cooler and quieter environment for vessel and crew
- Reduced external connections eliminates hoses and fittings that can leak or break
Directed Top-liner Cooling
- Reduces upper liner temperature by as much as 130 degrees Fahrenheit
- Durable and reliable power cylinder components
Replaceable Wet-type Cylinder Liners
- Hardened and precision machined for long life
Corrosion Resistant Components
- Provides engine protection from the effects of seawater
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If you have a high horsepower marine application you'll definitely want to check out our new 13.5L engine. It delivers reliable and durable power up to 559 kW (750 hp) in a compact, heat exchanger cooled configuration with side or front service locations.
More horses in the engine room aren't the only things you'll like about our new 13.5L. Like all John Deere marine engines, it also features low noise, low vibration, and excellent fuel economy. And with high torque at low RPM, you get excellent vessel control and maneuvering. Enjoy all this, along with more power and flexibility, with our new 6135SFM75 marine engine.
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High rpm, high performance throw-away diesels have their place in planing pleasure craft that rarely get too far from the local yacht club. But why put one of these engines, even a derated version, in your commercial boat or long range cruising yacht? These vessels need a real, heavy duty diesel that produces high, prop twisting torque at a rational rpm. They need a conservatively rated engine with long life features like the L1276A2.
Initially designed for Alaskan fishermen, Luggers have always been dependable. Used as prime movers on Northern Lights marine generator sets, they are well known by commercial and pleasure craft owners for long life and smooth, quiet operation. Today, electronic fuel injected engines like this L1276A2 are adding US EPA Tier II compliance to Lugger's reputation for reliability, simplicity and durability.
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The more compact the engine design; the broader its application possibilities. That's why Yanmar makes compact engines; our power-to-weight and size ratios are setting industry standards for others to follow.
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Yanmar engines just last and last. Superior technology results in state-of-the-art propulsion systems you can rely on. For example, the qualily of the diesel fuel is optimised by superb tillering, including a centrifugal oil cleaner and large oil filter. The 6/8 cylinder heads separately are light enough to be lifted by one person, yet extremely strong. Day to day checks can be carried out via ergonomic access points (front mounted), like the oil dipstick, oil filler, fuel filter, cooling water filling and oil filling.
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The 8SY-STP features individual cylinder heads that offer substantial weight savings and are light enough to be lifted and reinserted by one person. Together with a modular design for fewer maintenance operations, electronic diagnostics and easily accessible service points make routine engine care simple and economical.The more power, less weight design allows for maximized torque at low revs, improved fuel economy and reduced emissions.
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Engine Design - Reliable base engine uses common components from the proven K19, K38 and K50 engines. A new cast-iron, ductile single-piece piston with nitride-coated rings and hardened cylinder liner increases durability and reduces maintenance
Fuel System - Modular Common-Rail Fuel System features a simplified design which provides constant high injection pressure regardless of engine speed or load conditions. Benefits include significantly reduced noise and vibration for quiet operation, better idle stability and improved low-end torque
Cooling System - Single-loop cooling eliminates the need for two keel coolers for reduced installation expense. Engine-mounted titanium plate heat exchanger provides superior durability with minimal maintenance requirements
Exhaust System - Water-cooled exhaust manifold cools engine surface temperatures. Design is a cast single piece construction that eliminates potential exhaust leakage
Air System - Mounted or remote marine grade air cleaner with replaceable element reduces maintenance cost. Water-cooled turbocharger optimized for vessel operating conditions and safety
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6 CYLINDERS IN LINE - DIESEL CYCLE
405 kW (550 CV) @ 2600 rpm (A1)
368 kW (500 CV) @ 2600 rpm (A2)
331 kW (450 CV) @ 2600 rpm (B)
294 kW (400 CV) @ 2600 rpm (C)
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Yanmar engines just last and last. Superior technology results in state-of-the-art propulsion systems you can rely on. For example, the qualily of the diesel fuel is optimised by superb tillering, including a centrifugal oil cleaner and large oil filter. The 6/8 cylinder heads separately are light enough to be lifted by one person, yet extremely strong. Day to day checks can be carried out via ergonomic access points (front mounted), like the oil dipstick, oil filler, fuel filter, cooling water filling and oil filling.
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6 CYLINDERS IN LINE - DIESEL CYCLE
567 kW (770 CV) @ 2300 rpm (A1)
515 kW (700 CV) @ 2300 rpm (A2)
442 kW (600 CV) @ 2300 rpm (B)
397 kW (540 CV) @ 2300 rpm (C)
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Engine Design - Low profse tor ease of installation and service. Replaceable wet cylinder liners offer longer life and lower rebuild cost. Gallery cooled pistons for maximum durability
Fuel System - Dependable Cummins FT fuel system can be operated mechanically or with CENTRY electronics for precise engine fueling. Step Timing Control (STC) allows for smooth engine acceleration under load
Cooling System - Keel cooked or engine mounted plate beat exchanger for reduced installation cost and less maintenance. Spin-on Cummins water treatment filters for protection against cooling system corrosion
Exhaust System - Dry exhaust manifold with water shielding for reduced fuel consumption and improved performance
Air System - Marine grade air titers with air Inlet restriction indicator. Twin Holset turbocbargers optimized for marine usage
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6 CYLINDERS IN LINE - DIESEL CYCLE
607 kW (825 CV) @ 2400 rpm (A1)
552 kW (750 CV) @ 2400 rpm (A2)
478 kW (650 CV) @ 2400 rpm (B)
442 kW (600 CV) @ 2400 rpm (C)
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The 8SY-STP features individual cylinder heads that offer substantial weight savings and are light enough to be lifted and reinserted by one person. Together with a modular design for fewer maintenance operations, electronic diagnostics and easily accessible service points make routine engine care simple and economical.The more power, less weight design allows for maximized torque at low revs, improved fuel economy and reduced emissions.
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In designing the engines, consideration was given to their intensive use and to the desirability of easy and simple maintenance. These engines feature individual cylinder heads and wide inspection doors in the block, which makes access to the inside parts of the engine easy, and shortens the service time during maintenance and repair processes.
This series comprises six and eight cylinder in-line engines as well as twelve and sixteen cylinder 60º V-bank engines.
- Reliable
- Efficient
- Economic maintenance
- Environmental-friendly
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In designing the engines, consideration was given to their intensive use and to the desirability of easy and simple maintenance. These engines feature individual cylinder heads and wide inspection doors in the block, which makes access to the inside parts of the engine easy, and shortens the service time during maintenance and repair processes.
This series comprises six and eight cylinder in-line engines as well as twelve and sixteen cylinder 60º V-bank engines.
- Reliable
- Efficient
- Economic maintenance
- Environmental-friendly
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Cummins MerCruiser Diesel’s Quantum engines are the result of decades of research and cutting-edge innovations. You can count on Quantum engines for:
- Instant start-up in cold weather
- Virtually smoke and od
- Lighter weight with increased power
- Simplified engine information management
- 80% less noise at idle on the QSB Series
- SmartCraft vessel integration
- Unmatched durability
- EPA Tier 2, IMO and RCD certifications
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ACERT High Performance 423 bkW (567 bhp) 575 mhp at 2500 rpm
Specifications
Configurations
In-line 6 cylinder
Cycle 4-Stroke-Cycle-Diesel
Bore x Stroke 112 mm (4.41 in) x 149 mm (5.87 in)
Displacement 8.8 L (538 cu in)
Governor Electronic
Aspiration Turbocharged - Aftercooled
LxWxH (mm) 1198 mm x 974 mm x 983 mm
LxWxH (in) 47.2 in x 38.3 in x 38.7 in
Weight (Approx. dry) 946 kg (2086 lb)
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Cummins MerCruiser Diesel’s Quantum engines are the result of decades of research and cutting-edge innovations. You can count on Quantum engines for:
- Instant start-up in cold weather
- Virtually smoke and od
- Lighter weight with increased power
- Simplified engine information management
- 80% less noise at idle on the QSB Series
- SmartCraft vessel integration
- Unmatched durability
- EPA Tier 2, IMO and RCD certifications
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The D12-800 engine is more powerful and cleaner than the class-leading predecessors and the successful D12 engine concept now delivers more horsepower than ever before. The Volvo Penta D12 is perfectly designed for twin-engine installation in flybridge boats and sport cruisers ranging from 50 to 70 feet.
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550 bhp - 1900 rpm
CHARACTERISTICS
Diesel engine, 4 stroke, direct injection, turbocharged with charge air intercooling.
TECHNICAL DESCRIPTION
Cast iron cylinder block, highly ribbed, with strengthened seating face
Main bearing caps semi imbedded with vertical attachment
One inspection door per cylinder enabling an easy access to the connecting rod fixations
Cast iron liners, wet type, extremely rigid
Separate cylinder heads with large water circulation sections ensuring a maximised cooling mainly for the nozzle holder copper housing
Attachment of each cylinder head in eight points by high strength bolts with spherical seating washers under the bolts located between two cylinder heads
4 valves per cylinder head, with special steel thick head, with built up guides and seats, and rotators on exhaust valves
Special forged hardened steel crankshaft, with induction hardened journals, crankpins and connecting radius
Camshaft with polynomial profiled cams
Distribution system with tempered, hardened and surface corrected helicoïdal type gears
Chrome - molibdenum steel connecting rods
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from 135 to 600 bhp
between 1200 & 1800 rpm
CHARACTERISTICS
Diesel engine, 4 stroke, direct injection, turbocharged, with charge air intercooling.
TECHNICAL DESCRIPTION
Cast iron cylinder block, highly ribbed, with strengthened seating face
Main bearing caps fully imbedded with vertical and horizontal attachments
One inspection door per cylinder enabling an easy access to the connecting rod fixations
Cast iron liners, wet type, extremely rigid
Separate cylinder heads with large water circulation sections ensuring a maximised cooling mainly for the nozzle holder copper housing
Attachment of each cylinder head in eight points by high strength bolts with spherical seating washers under the bolts located between two cylinder heads
4 valves per cylinder head, with special steel thick head, with built up guides and seats, and rotators on exhaust valves
Special forged hardened steel crankshaft, with induction hardened journals, crankpins and connecting radius
Camshaft with polynomial profiled cams
Distribution system with tempered, hardened and surface corrected helicoïdal type gears
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from 200 to 660 bhp
between 1200 & 1800 rpm
CHARACTERISTICS
Diesel engine, 4 stroke, direct injection, turbocharged.
TECHNICAL DESCRIPTION
Cast iron cylinder block, highly ribbed, with strengthened seating face
Main bearing caps fully imbedded with vertical and horizontal attachments
One inspection door per cylinder enabling an easy access to the connecting rod fixations
Cast iron liners, wet type, extremely rigid
Separate cylinder heads with large water circulation sections ensuring a maximised cooling mainly for the nozzle holder copper housing
Attachment of each cylinder head in eight points by high strength bolts with spherical seating washers under the bolts located between two cylinder heads
4 valves per cylinder head, with special steel thick head, with built up guides and seats, and rotators on exhaust valves
Special forged hardened steel crankshaft, with induction hardened journals, crankpins and connecting radius
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700 bhp - 1900 rpm
CHARACTERISTICS
Diesel engine, 4 stroke, direct injection, turbocharged, with charge air intercooling.
TECHNICAL DESCRIPTION
Cast iron cylinder block, highly ribbed, with strengthened seating face
Main bearing caps fully imbedded with vertical and horizontal attachments
One inspection door per cylinder enabling an easy access to the connecting rod fixations
Cast iron liners, wet type, extremely rigid
Separate cylinder heads with large water circulation sections ensuring a maximised cooling mainly for the nozzle holder copper housing
Attachment of each cylinder head in eight points by high strength bolts with spherical seating washers under the bolts located between two cylinder heads
4 valves per cylinder head, with special steel thick head, with built up guides and seats, and rotators on exhaust valves
Special forged hardened steel crankshaft, with induction hardened journals, crankpins and connecting radius
Camshaft with polynomial profiled cams
Distribution system with tempered, hardened and surface corrected helicoïdal type gears
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