New
Yanmar53 HP
Yanmar 4JH45E 53.8HP
diesel
$4,050.00
Click to zoom
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
This Yanmar engine features a direct injection diesel system with turbocharging and intercooling to boost efficiency and torque. Built to meet international marine emission and safety standards, it balances power and weight while providing dependable service for recreational and commercial boats.
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.
