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Yanmar53 HP
Yanmar 4JH45E 53.8HP
diesel
$4,050.00
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New
Yanmar
Yanmar 4LHA-STP (Z) 240 HP
$7,150.00
The Yanmar 4LHA-STP (Z) is a 240 HP turbocharged & intercooled marine diesel engine designed for stern-drive or inboard applications. It delivers strong performance with a compact, reliable 4-cylinder configuration suitable for medium-sized vessels.
Horsepower
240 HP
Fuel Type
gasoline
Displacement
3.455L
Stroke
4-stroke
Rated Output
177 kW /240 hp
Rated Speed
3100rpm
In Stock (3 available)
Free shipping on orders over $500
90-day warranty included
Description
Buy new Yanmar marine engines for sale or browse used Yanmar marine engines built for dependable power and efficient marine operation. Yanmar engines are trusted by boat owners searching for reliable diesel propulsion, replacement marine engines, and long-lasting performance on the water. Designed for fuel efficiency and durability, these marine engines support both recreational and commercial vessel applications.
Engineered for consistent output and dependable operation, Yanmar marine engines combine advanced diesel technology with efficient marine performance. Built to perform under changing water conditions, these engines deliver smooth power and reliable propulsion for extended marine use.
Featuring direct injection diesel technology, Yanmar engines provide accurate fuel delivery and optimized combustion efficiency. Turbocharging and intercooling systems work together to improve torque response, increase operating efficiency, and maintain dependable performance under varying engine loads.
The advanced engineering approach creates an effective balance between power, engine weight, and fuel economy. This combination helps improve vessel efficiency while supporting stable operation for marine upgrades, repower projects, and long-distance boating applications.
Designed to comply with international marine emission and operational standards, Yanmar marine engines deliver cleaner performance and dependable long-term ownership. Boat owners looking to buy used Yanmar marine engines or searching for new marine engines for sale continue to choose Yanmar for trusted reliability and efficient marine propulsion.
Key Features:
• Direct injection diesel engine technology
• Turbocharged marine performance
• Intercooling system for improved efficiency
• Increased torque and responsive power delivery
• Optimized power-to-weight ratio
• Fuel-efficient marine operation
• International marine emission compliance
• Reliable long-term engine durability
• Suitable for recreational and commercial vessels
• Dependable marine propulsion performance
Specifications
SKUY640821
BrandYanmar
CategoryInboard Engines
ConditionNew
Horsepower240 HP
Fuel Typegasoline
Displacement3.455L
No. of Cylinders4 cylinders
Stroke4-stroke
Weight805.00 lbs
Rated Output177 kW /240 hp
Rated Speed3100rpm
Alternator12 volt, 55 amp
Frequently Asked Questions
What is the Yanmar 4LHA-STP (Z) engine?
The Yanmar 4LHA-STP (Z) is a high-output 4-cylinder diesel marine engine with turbocharging and intercooling, designed for demanding marine propulsion applications such as sterndrive or shaft drive boats. It delivers 240 metric horsepower (mhp) at 3300 rpm and is part of Yanmar’s LH Series of marine diesels.
What are the key technical specifications?
Rated power: ~177 kW / 240 mhp 3300 rpm Displacement: 3.455 L (211 cu in) Cylinders: 4 inline Bore x Stroke: 100 mm x 110 mm Combustion: Direct injection with in-line pump. Aspiration: Turbocharged & intercooled. Alternator: 12 V – 80 A Dry weight (without gear): ~365 kg (805 lbs) Dimensions: ~1131 mm x 719 mm x 811 mm Controls: Mechanical
What type of cooling system does this engine use?
The 4LHA-STP uses a freshwater cooling system with a centrifugal freshwater pump and a seawater impeller pump, which helps manage engine temperatures and protect against saltwater corrosion.
What type of fuel system does it have?
It features direct fuel injection with an in-line pump, offering efficient combustion, power output, and reliability under marine load conditions.
What boats is the 4LHA-STP (Z) suitable for?
It’s ideal for sterndrive powerboats, performance cruisers, and medium-size recreational or commercial vessels where good power-to-weight ratio, reliability, and fuel efficiency are required.
What transmission options are available?
The engine is typically installed with marine gearboxes such as KMH50A or ZF63A (and compatible alternatives), depending on the vessel layout and drive type.
How efficient is the Yanmar 4LHA-STP engine?
Fuel efficiency depends on boat load, speed, prop choice, and operating conditions. The turbocharged and intercooled design improves torque and power delivery, helping optimize fuel use at cruising speeds.
What maintenance does this engine require?
Regular engine oil and filter changes Inspection and replacement of fuel/water separators Cooling system checks (impeller, heat exchanger) Belt and hose inspections.
Can owners do maintenance themselves?
Basic checks (oil level, coolant, belts) can be done by skilled owners, but major service, diagnostics, and repairs should be carried out by certified marine technicians to ensure performance and maintain warranty coverage.
What’s the difference between 4LHA-STP and 4LHA-STP (Z)?
The base technical specifications are the same, but “(Z)” often refers to configurations optimized for specific transmission or sterndrive installations, such as compatibility with particular gear types.
