What Is the Yanmar 4LV Marine Engine?
The Yanmar 4LV Marine Engine is a compact inline four-cylinder, four-stroke marine diesel family designed for recreational, cruising, repower, and selected light-duty commercial applications.
The 4LV family includes:
- Yanmar 4LV150
- Yanmar 4LV170
- Yanmar 4LV195
- Yanmar 4LV230
- Yanmar 4LV250
Yanmar also offers Z-designation sterndrive versions of these engines. The family uses a 2.755-liter four-cylinder platform with direct injection, Denso common-rail technology, turbocharging, and intercooling.
Alfa Marine Spare Parts supplies OEM, genuine, aftermarket, and remanufactured Yanmar 4LV marine engine spare parts for scheduled maintenance, fuel-system repairs, cooling-system work, turbocharger service, electrical repairs, rebuilding, and engine overhaul requirements.
Yanmar 4LV Technical Information
The main 4LV models share the same fundamental engine architecture.
SpecificationYanmar 4LV SeriesManufacturerYanmarEngine Family4LVEngine TypeFour-stroke marine dieselCylinders4Cylinder ArrangementInlineDisplacement2.755 LBore92 mmStroke103.6 mmCombustionDirect InjectionFuel SystemDenso Common RailAspirationTurbocharged & IntercooledCoolingFreshwater + seawater coolingMarine ConfigurationsInboard and Z sterndrive versionsRated Speed3500 or 3800 rpm depending on modelWhich Yanmar 4LV Models Are Available?Yanmar 4LV150
The Yanmar 4LV150 is the entry model in the family and is rated at approximately:
110 kW / 150 mhp at 3500 rpm.
Yanmar 4LV170
The Yanmar 4LV170 is rated at approximately:
125 kW / 170 mhp at 3500 rpm.
Yanmar 4LV195
The Yanmar 4LV195 is rated at approximately:
143 kW / 195 mhp at 3500 rpm.
Yanmar 4LV230
The Yanmar 4LV230 is rated at approximately:
169 kW / 230 mhp at 3800 rpm.
Yanmar 4LV250
The Yanmar 4LV250 is the highest-output version in the standard family and is rated at:
184 kW / 250 mhp at 3800 rpm.
Is the Yanmar 4LV a Four-Cylinder Engine?
Yes.
The Yanmar 4LV uses an inline four-cylinder configuration.
The engine platform has:
- 4 cylinders
- 2.755 L displacement
- 92 mm bore
- 103.6 mm stroke
The compact inline-four layout makes the 4LV particularly suitable for installations where engine-room space and weight are important.
Is the Yanmar 4LV a Four-Stroke Engine?
Yes.
The Yanmar 4LV is a four-stroke, water-cooled marine diesel engine.
Its operating cycle consists of:
- Intake
- Compression
- Combustion and power
- Exhaust
The complete operating cycle takes place over two crankshaft revolutions.
What Fuel System Does the Yanmar 4LV Use?
The 4LV uses Denso common-rail direct injection. Yanmar identifies common-rail technology as a core feature of the 4LV family.
Available fuel-system components can include:
- Common-Rail Fuel Injectors
- High-Pressure Fuel Pumps
- Fuel Supply Pumps
- Fuel Rail Components
- Fuel Pressure Sensors
- Pressure-Control Components
- Fuel Filters
- Fuel Filter Housings
- High-Pressure Fuel Pipes
- Low-Pressure Fuel Lines
- Injector Seals
- Injector O-Rings
- Fuel-System Gaskets
- Electronic Fuel-Control Components
Yanmar 4LV Fuel Injector Parts
The four common-rail injectors control the timing and quantity of fuel delivered to the cylinders.
Available components can include:
- Complete Fuel Injectors
- Remanufactured Injectors
- Injector Seals
- Injector O-Rings
- Injector Washers
- Injector Hardware
- High-Pressure Fuel Pipes
- Associated Common-Rail Components
Injector condition can affect:
- Cold starting
- Hot starting
- Idle quality
- Engine power
- Acceleration
- Fuel consumption
- Cylinder balance
- Exhaust smoke
- Combustion quality
The correct injector should be identified using the exact 4LV150, 4LV170, 4LV195, 4LV230, or 4LV250 model and serial number.
Yanmar 4LV High-Pressure Fuel Pump Parts
The high-pressure fuel pump supplies pressurized fuel to the common rail.
Available components can include:
- Complete High-Pressure Fuel Pumps
- Pump Components
- Pressure-Control Components
- Fuel Connections
- Pump Seals
- Associated Gaskets
- Mounting Hardware
Is the Yanmar 4LV Turbocharged?
Yes.
Yanmar specifies the 4LV family as turbocharged and intercooled.
Available turbocharger components can include:
- Complete Turbochargers
- Remanufactured Turbochargers
- Turbocharger Cartridges
- Compressor Components
- Turbine Components
- Bearings
- Seals
- Oil Supply Components
- Oil Drain Components
- Turbocharger Gaskets
- Mounting Hardware
The correct turbocharger should be matched to the exact 4LV model and rating.
What Does the Yanmar 4LV Intercooler Do?
The turbocharger compresses the intake air, increasing both pressure and temperature.
The intercooler reduces the temperature of this compressed air before it reaches the cylinders.
Available components can include:
- Complete Intercoolers
- Charge-Air Cooler Cores
- Cooler Housings
- End Covers
- Intake Pipes
- Air Connections
- Hoses
- Clamps
- Gaskets
- O-Rings
- Seals
Yanmar 4LV Cylinder Head Parts
Available cylinder-head components can include:
- Complete Cylinder Heads
- Intake Valves
- Exhaust Valves
- Valve Guides
- Valve Seats
- Valve Springs
- Rocker Components
- Injector Components
- Cylinder Head Gaskets
- Cylinder Head Seals
- Associated Hardware
Yanmar 4LV Piston Parts
The engine contains four piston assemblies.
Available piston-related components can include:
- Pistons
- Piston Rings
- Piston Pins
- Retaining Components
- Associated Hardware
Piston and ring condition can influence:
- Compression
- Combustion sealing
- Blow-by
- Oil consumption
- Engine power
- Overall engine performance
Yanmar 4LV Connecting Rod Parts
Available components can include:
- Connecting Rods
- Connecting Rod Bearings
- Connecting Rod Bushings
- Connecting Rod Bolts
- Associated Hardware
Yanmar 4LV Crankshaft and Bearing Parts
Available rotating-assembly components can include:
- Complete Crankshafts
- Main Bearings
- Connecting Rod Bearings
- Thrust Bearings
- Crankshaft Gear Components
- Front Crankshaft Seals
- Rear Crankshaft Seals
- Vibration Damper Components
- Associated Hardware
Yanmar 4LV Camshaft and Valve Train Parts
Available components can include:
- Camshafts
- Camshaft Bearings
- Timing Components
- Rocker Components
- Intake Valves
- Exhaust Valves
- Valve Guides
- Valve Seats
- Valve Springs
- Associated Hardware
How Is the Yanmar 4LV Cooled?
Yanmar specifies freshwater cooling with a centrifugal freshwater pump and seawater cooling using a rubber-impeller seawater pump on the 4LV150, 4LV170, and 4LV195 technical data.
Available cooling components can include:
- Freshwater Pumps
- Coolant Pumps
- Seawater Pumps
- Thermostats
- Thermostat Housings
- Heat Exchangers
- Coolant Pipes
- Raw-Water Pipes
- Cooling Hoses
- Temperature Sensors
- Gaskets
- O-Rings
- Seals
Yanmar 4LV Freshwater Pump Parts
The freshwater pump circulates coolant through the closed engine-cooling circuit.
Available components can include:
- Complete Freshwater Pumps
- Pump Shafts
- Pump Bearings
- Mechanical Seals
- Pump Impellers
- Pump Housings
- Gaskets
- O-Rings
- Associated Hardware
Yanmar 4LV Seawater Pump Parts
The seawater pump circulates raw water through the marine cooling circuit.
Available parts can include:
- Complete Seawater Pumps
- Rubber Impellers
- Raw-Water Pumps
- Pump Shafts
- Pump Bearings
- Mechanical Seals
- Pump Covers
- Wear Components
- Gaskets
- O-Rings
- Raw-Water Connections
Yanmar 4LV Heat Exchanger Parts
Available components can include:
- Complete Heat Exchangers
- Heat Exchanger Cores
- Heat Exchanger Housings
- End Covers
- End Caps
- Gaskets
- O-Rings
- Seals
- Freshwater Connections
- Raw-Water Connections
- Associated Hardware
Yanmar 4LV Lubrication System Parts
Available lubrication-system components can include:
- Engine Oil Pumps
- Oil Filters
- Oil Filter Elements
- Oil Filter Housings
- Oil Coolers
- Oil Cooler Components
- Oil Pressure Sensors
- Oil Lines
- Oil Pipes
- Oil Pan Components
- Oil Seals
- Lubrication-System Gaskets
The lubrication system protects major components including:
- Crankshaft
- Main Bearings
- Connecting Rod Bearings
- Camshaft
- Valve Train
- Pistons
- Turbocharger
Yanmar 4LV Electronic Engine Components
Electronic engine management is an important part of the 4LV platform. Yanmar's current 4LV documentation also shows integration with vessel-control systems on applicable configurations.
Depending on configuration, available components can include:
- Engine Control Components
- Fuel Pressure Sensors
- Oil Pressure Sensors
- Coolant Temperature Sensors
- Engine Speed Sensors
- Position Sensors
- Wiring Harnesses
- CAN-Bus Components
- Control Panels
- Displays
- Vessel-Control Components
- Electrical Connections
Yanmar 4LV Starting and Charging Parts
Available electrical components can include:
- Starter Motors
- Alternators
- Starter Solenoids
- Relays
- Alternator Pulleys
- Drive Belts
- Wiring Components
- Electrical Connections
- Associated Hardware
Yanmar lists a 12 V, 130 A alternator on the 4LV250 specification.
Yanmar 4LV Exhaust Parts
Available exhaust-system components can include:
- Exhaust Manifold Components
- Exhaust Manifold Gaskets
- Turbocharger Connections
- Exhaust Mixing Elbows
- Exhaust Pipes
- Exhaust Cooling Components
- Marine Exhaust Connections
- Exhaust Seals
- Mounting Hardware
Yanmar 4LV Gaskets and Seals
Available sealing components can include:
- Cylinder Head Gaskets
- Valve Cover Gaskets
- Intake Gaskets
- Exhaust Gaskets
- Turbocharger Gaskets
- Intercooler Gaskets
- Heat Exchanger Gaskets
- Freshwater Pump Gaskets
- Seawater Pump Gaskets
- Oil Cooler Gaskets
- Injector Seals
- Crankshaft Seals
- O-Rings
- Complete Gasket Sets
- Engine Seal Kits
Yanmar 4LV Overhaul Parts
Depending on the engine condition and overhaul scope, available components can include:
- Pistons
- Piston Rings
- Piston Pins
- Main Bearings
- Connecting Rod Bearings
- Thrust Bearings
- Connecting Rod Components
- Cylinder Head Components
- Intake Valves
- Exhaust Valves
- Common-Rail Injectors
- Crankshaft Seals
- Complete Gasket Sets
- Seal Kits
- Freshwater Pumps
- Seawater Pumps
- Oil Pumps
- Turbocharger Components
- Cooling-System Components
Major replacement components can also include:
- Crankshafts
- Camshafts
- Connecting Rods
- Complete Cylinder Heads
- Turbochargers
- Intercoolers
- Heat Exchangers
- High-Pressure Fuel Pumps
- Common-Rail Components
- Electronic Engine Components
Can the Yanmar 4LV Be Used With a Sterndrive?
Yes.
Yanmar lists 4LV150Z, 4LV170Z, 4LV195Z, 4LV230Z, and 4LV250Z sterndrive versions alongside the standard 4LV models.
Depending on the installation, components can include:
- Bell Housing Components
- Couplings
- Drive Connections
- Cooling Connections
- Exhaust Connections
- Mounting Components
- Associated Hardware
Sterndrive-specific components should be identified separately using the applicable drive model and serial number.
What Marine Applications Use the Yanmar 4LV?
The 4LV family is suitable for a broad range of marine installations, including:
- Motor Yachts
- Cruising Boats
- Recreational Powerboats
- Fast Cruisers
- Sport-Fishing Boats
- Planing-Hull Vessels
- Light Commercial Craft
- Patrol Craft
- Service Craft
- Repower Projects
- New-Build Projects
- Shaft-Drive Installations
- Sterndrive Installations
Yanmar also supports modern joystick-control integration with the 4LV in applicable twin-engine inboard installations.
Which Yanmar 4LV Engine Do I Have?
Start with the complete model designation.
Typical models include:
- Yanmar 4LV150
- Yanmar 4LV170
- Yanmar 4LV195
- Yanmar 4LV230
- Yanmar 4LV250
Sterndrive versions may carry the Z designation.
When requesting Yanmar 4LV Marine Engine Spare Parts, provide:
- Complete engine model
- Engine serial number
- Existing part number
- Component description
- Quantity required
- Rated power
- Shaft-drive or sterndrive configuration
- Marine gear or drive model where applicable
- Vessel-control configuration
- Clear photographs of the existing component
- Delivery country or port
This information is especially important for common-rail injectors, high-pressure fuel pumps, turbochargers, seawater pumps, heat exchangers, electronic controls, sensors, starter motors, alternators, and propulsion-specific components.