Yanmar 4JH80 Marine Engine Spare Parts
The Yanmar 4JH80 Marine Engine is a compact four-cylinder marine diesel designed primarily for sailing yachts, cruising yachts, catamarans, motor sailers, and other recreational marine applications where dependable auxiliary propulsion and compact installation dimensions are important.
The 4JH80 belongs to Yanmar's modern JH common-rail marine engine family. It combines electronic common-rail fuel injection, turbocharging, intercooling, freshwater cooling, and electronic engine management.
With a rated output of approximately 59 kW / 80 mhp at 3200 rpm, the 4JH80 provides a useful balance between compact engine size and propulsion power.
Alfa Marine Spare Parts supplies OEM, genuine, aftermarket, and remanufactured Yanmar 4JH80 marine engine spare parts for scheduled maintenance, fuel-system repairs, turbocharger service, cooling-system work, electrical repairs, engine rebuilding, and overhaul requirements.
What Are the Technical Specifications of the Yanmar 4JH80?
Typical Yanmar 4JH80 specifications include:
SpecificationYanmar 4JH80ManufacturerYanmarEngine Model4JH80Engine TypeFour-stroke marine dieselCylinder ArrangementInlineNumber of Cylinders4DisplacementApprox. 1.995 LBore84 mmStroke90 mmRated OutputApprox. 59 kW / 80 mhpRated Speed3200 rpmCombustionDirect InjectionFuel SystemCommon RailAspirationTurbocharged & IntercooledCoolingFreshwater cooling with marine heat exchangerEngine ManagementElectronicElectrical System12 V
Exact equipment and specifications should be confirmed against the engine identification and applicable Yanmar documentation.
Is the Yanmar 4JH80 a Four-Cylinder Engine?
Yes.
The Yanmar 4JH80 is an inline four-cylinder marine diesel.
Its basic engine dimensions include approximately:
- 4 cylinders
- 1.995 L displacement
- 84 mm bore
- 90 mm stroke
This compact four-cylinder arrangement is particularly useful on sailing yachts where engine-room space can be limited.
How Much Power Does the Yanmar 4JH80 Produce?
The Yanmar 4JH80 is rated at approximately:
59 kW / 80 mhp at 3200 rpm
The actual operating load and continuous operating requirements should follow the applicable Yanmar engine documentation and vessel installation requirements.
Is the Yanmar 4JH80 a Four-Stroke Engine?
Yes.
The 4JH80 operates using the four-stroke diesel cycle:
- Intake
- Compression
- Combustion and power
- Exhaust
One complete cycle takes place over two crankshaft revolutions.
What Fuel System Does the Yanmar 4JH80 Use?
The Yanmar 4JH80 uses an electronically controlled common-rail direct-injection system.
This system is considerably different from the mechanical fuel-injection equipment found on many older Yanmar marine engines.
Fuel-system components can include:
- Common-Rail Fuel Injectors
- High-Pressure Fuel Pump
- Fuel Rail
- Fuel Pressure Sensors
- Pressure-Control Components
- Fuel Supply Components
- Fuel Filters
- Fuel Filter Elements
- Fuel Filter Housings
- High-Pressure Fuel Pipes
- Low-Pressure Fuel Lines
- Injector Seals
- Injector Washers
- Fuel-System Gaskets
- Electronic Fuel-Control Components
Yanmar 4JH80 Common-Rail Fuel Injector Parts
The engine uses four electronically controlled fuel injectors.
Available injector-related components can include:
- Complete Common-Rail Injectors
- Remanufactured Injectors
- Injector Seals
- Injector Washers
- Injector O-Rings
- Injector Hardware
- High-Pressure Fuel Pipes
- Associated Common-Rail Components
Problems involving injectors or associated fuel components can contribute to:
- Difficult starting
- Rough idle
- Uneven cylinder operation
- Poor acceleration
- Reduced engine output
- Increased exhaust smoke
- Higher fuel consumption
- Abnormal combustion
Common-rail components should be identified against the 4JH80 engine serial number before ordering.
Yanmar 4JH80 High-Pressure Fuel Pump Parts
The high-pressure pump supplies pressurized fuel to the common rail.
Available components can include:
- Complete High-Pressure Fuel Pumps
- Pump Components
- Pressure-Control Components
- Pump Seals
- Fuel Connections
- Associated Gaskets
- Mounting Hardware
Cleanliness is particularly important when servicing high-pressure common-rail components.
Yanmar 4JH80 Fuel Filter Parts
Proper fuel filtration helps protect the injectors and high-pressure fuel system.
Available components can include:
- Primary Fuel Filters
- Secondary Fuel Filters
- Fuel Filter Elements
- Fuel Filter Housings
- Water Separators
- Filter Seals
- O-Rings
- Drain Components
Is the Yanmar 4JH80 Turbocharged?
Yes.
The Yanmar 4JH80 is turbocharged and intercooled.
The turbocharger uses energy from the exhaust gases to compress intake air, allowing the engine to produce more power from its relatively compact displacement.
Available turbocharger components can include:
- Complete Turbochargers
- Remanufactured Turbochargers
- Turbocharger Cartridges
- Compressor Components
- Turbine Components
- Turbocharger Shafts
- Bearings
- Seals
- Oil Supply Components
- Oil Drain Components
- Turbocharger Gaskets
- Mounting Hardware
What Does the Yanmar 4JH80 Intercooler Do?
Compressing intake air in the turbocharger increases its temperature.
The intercooler helps reduce this temperature before the air enters the cylinders.
Available components can include:
- Complete Intercoolers
- Charge-Air Cooler Components
- Cooler Cores
- Cooler Housings
- End Covers
- Intake Pipes
- Air Connections
- Hoses
- Clamps
- Gaskets
- O-Rings
- Seals
Yanmar 4JH80 Air Intake Parts
Available air-intake components can include:
- Air Intake Components
- Air Filter Components
- Intake Pipes
- Turbocharger Connections
- Intercooler Connections
- Intake Manifold Components
- Air Hoses
- Clamps
- Intake Gaskets
- O-Rings
- Seals
Yanmar 4JH80 Cylinder Head Parts
The cylinder head contains important combustion, injection, and valve-train components.
Available parts can include:
- Complete Cylinder Heads
- Intake Valves
- Exhaust Valves
- Valve Guides
- Valve Seats
- Valve Springs
- Rocker Components
- Injector Components
- Cylinder Head Gaskets
- Valve Cover Gaskets
- Cylinder Head Seals
- Associated Hardware
Yanmar 4JH80 Piston and Piston Ring Parts
The engine uses four piston assemblies.
Available components can include:
- Pistons
- Piston Rings
- Piston Pins
- Retaining Components
- Associated Hardware
Piston and ring condition can affect:
- Cylinder compression
- Combustion sealing
- Blow-by
- Oil consumption
- Starting performance
- Engine power
Yanmar 4JH80 Connecting Rod Parts
Available components can include:
- Connecting Rods
- Connecting Rod Bearings
- Connecting Rod Bushings
- Connecting Rod Bolts
- Associated Hardware
The connecting rods transfer combustion force from the pistons to the crankshaft.
Yanmar 4JH80 Crankshaft and Bearing Parts
Available components can include:
- Complete Crankshafts
- Main Bearings
- Connecting Rod Bearings
- Thrust Bearings
- Crankshaft Gear Components
- Front Crankshaft Seals
- Rear Crankshaft Seals
- Associated Hardware
Yanmar 4JH80 Camshaft and Valve Train Parts
Available components can include:
- Camshaft Components
- Camshaft Bearings
- Timing Components
- Rocker Components
- Intake Valves
- Exhaust Valves
- Valve Guides
- Valve Seats
- Valve Springs
- Associated Hardware
Yanmar 4JH80 Timing System Parts
Available timing-system components can include:
- Camshaft Drive Components
- Crankshaft Drive Components
- Timing Components
- Timing Covers
- Timing Cover Gaskets
- Associated Hardware
Timing components should be identified against the exact engine configuration before ordering.
How Is the Yanmar 4JH80 Cooled?
The Yanmar 4JH80 uses a closed freshwater cooling circuit combined with a seawater cooling circuit.
The freshwater side circulates coolant through the engine.
The raw-water side takes seawater from outside the vessel and carries heat away through the marine cooling system.
Available cooling components can include:
- Freshwater Pumps
- Seawater Pumps
- Heat Exchangers
- Thermostats
- Thermostat Housings
- Coolant Pipes
- Raw-Water Pipes
- Cooling Hoses
- Temperature Sensors
- Gaskets
- O-Rings
- Seals
Yanmar 4JH80 Freshwater Pump Parts
The freshwater pump circulates coolant through the closed engine circuit.
Available components can include:
- Complete Freshwater Pumps
- Pump Components
- Pump Shafts
- Pump Bearings
- Mechanical Seals
- Pump Housings
- Gaskets
- O-Rings
- Associated Hardware
Yanmar 4JH80 Seawater Pump Parts
The Yanmar 4JH80 seawater pump circulates raw water through the marine side of the cooling system.
Available components can include:
- Complete Seawater Pumps
- Raw-Water Pumps
- Impellers
- Pump Covers
- Pump Shafts
- Pump Bearings
- Mechanical Seals
- Wear Components
- Gaskets
- O-Rings
- Raw-Water Connections
A deteriorated impeller or worn pump can reduce cooling-water flow, but other restrictions in the raw-water circuit should also be considered when diagnosing overheating.
Yanmar 4JH80 Heat Exchanger Parts
The heat exchanger transfers heat from the closed engine-coolant circuit to the raw-water circuit without allowing the two fluids to mix under normal operation.
Available components can include:
- Complete Heat Exchangers
- Heat Exchanger Cores
- Heat Exchanger Housings
- End Covers
- End Caps
- Gaskets
- O-Rings
- Seals
- Coolant Connections
- Raw-Water Connections
- Associated Hardware
Yanmar 4JH80 Lubrication System Parts
Available lubrication components can include:
- Engine Oil Pumps
- Engine Oil Filters
- Oil Filter Elements
- Oil Filter Housings
- Oil Coolers
- Oil Pressure Sensors
- Oil Pressure Components
- Oil Pipes
- Oil Lines
- Oil Pan Components
- Oil Seals
- Lubrication-System Gaskets
The lubrication system protects important components including:
- Crankshaft
- Main Bearings
- Connecting Rod Bearings
- Camshaft
- Valve Train
- Pistons
- Turbocharger
Yanmar 4JH80 Oil Pump Parts
Available components can include:
- Complete Oil Pumps
- Pump Components
- Pump Housings
- Pressure-Regulating Components
- Oil Pump Seals
- Oil Pump Gaskets
- Associated Hardware
Yanmar 4JH80 Exhaust System Parts
Available exhaust-system components can include:
- Exhaust Manifold Components
- Exhaust Manifold Gaskets
- Turbocharger Connections
- Exhaust Mixing Elbows
- Exhaust Pipes
- Exhaust Cooling Components
- Exhaust Seals
- Mounting Hardware
Marine exhaust components should be inspected carefully because they operate under heat, moisture, exhaust-gas, and saltwater exposure.
Yanmar 4JH80 Electronic Engine Components
The 4JH80 uses electronic engine management together with its common-rail fuel system.
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
- Electrical Connectors
- CAN Communication Components
- Engine Monitoring Components
- Control Panels
- Displays
- Vessel-Control Components
Electronic components should be matched to the engine serial number and vessel-control configuration.
Yanmar 4JH80 Starter Motor and Alternator Parts
Available starting and charging components can include:
- Starter Motors
- Starter Solenoids
- Alternators
- Alternator Components
- Relays
- Pulleys
- Drive Belts
- Wiring Components
- Electrical Connections
- Associated Hardware
Yanmar 4JH80 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
- Front Crankshaft Seals
- Rear Crankshaft Seals
- O-Rings
- Complete Gasket Sets
- Engine Seal Kits
Yanmar 4JH80 Overhaul Parts
Depending on the condition of the engine and the required overhaul scope, parts 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 requirements can also involve:
- Crankshafts
- Camshaft Components
- Connecting Rods
- Complete Cylinder Heads
- Turbochargers
- Intercoolers
- Heat Exchangers
- High-Pressure Fuel Pumps
- Common-Rail Components
- Electronic Engine Components
What Marine Applications Use the Yanmar 4JH80?
The Yanmar 4JH80 is particularly suited to sailing and recreational marine applications.
Typical applications can include:
- Sailing Yachts
- Cruising Yachts
- Catamarans
- Sailboats
- Motor Sailers
- Recreational Craft
- Auxiliary Propulsion
- Yacht Repower Projects
- New-Build Yacht Projects
Is the Yanmar 4JH80 Suitable for Repowering?
Yes. The 4JH80 can be considered for repower projects where its power rating and installation characteristics are suitable for the vessel.
A proper repower assessment should consider more than engine horsepower, including:
- Engine dimensions
- Engine weight
- Engine mounts
- Marine transmission
- Gear ratio
- Propeller requirements
- Shaft alignment
- Exhaust capacity
- Seawater supply
- Fuel-system requirements
- Electrical installation
- Engine controls
- Engine-room ventilation
Which Yanmar 4JH80 Parts Should Be Identified by Serial Number?
The serial number should ideally be used for all engine-specific components.
It is particularly important for:
- Common-Rail Injectors
- High-Pressure Fuel Pumps
- Turbochargers
- Engine Control Components
- Sensors
- Wiring Harnesses
- Seawater Pumps
- Freshwater Pumps
- Heat Exchangers
- Starter Motors
- Alternators
- Cylinder Head Components
- Internal Engine Parts
What Information Is Needed to Identify Yanmar 4JH80 Parts?
For accurate Yanmar 4JH80 Marine Engine Spare Parts identification, provide:
- Engine model: Yanmar 4JH80
- Engine serial number
- Existing part number
- Part name or description
- Quantity required
- Marine gear model where applicable
- Engine-control configuration where applicable
- Clear photographs of the existing component
- Vessel or application information where relevant
- Delivery country or port
Providing the engine serial number together with the existing part number is especially useful for configuration-dependent fuel, turbocharger, cooling, electrical, and internal-engine components.