Yanmar 4JH80 Turbocharged Inboard Marine Diesel Engine

Description

Pounding into head seas outside coastal inlets requires positive turbo boost to sustain sailboat passage speeds. The Yanmar 4JH80 Inboard Engine answers this demand with a turbocharged 1.995L 4-Cylinder platform producing 80.0 BHP at 3,200 RPM and 73.0 BHP continuous at 3,107 RPM. Common-rail injection requires 2-micron pre-filtration, and seawater-cooled intercoolers require seasonal flushing to clear salt deposits.

A parent bore high-strength cast iron block integrates reinforced webbings to handle continuous turbocharger boost pressures. The single-piece 16-Valve cast iron cylinder head contains dual overhead camshafts with direct valve actuation. Electrical architecture features a 12V 2-pole isolated earth circuit with NMEA 2000 CAN-bus integration, a 1.4 kW starter, and a 12V 125A alternator. Dimensions span 35.8in long, 23.2in wide, and 24.9in high, weighing 549 lbs with gearbox. Oil pan capacity holds 1.45 US gal.

Key Features of Yanmar 4JH80

Passage-making sailors buy Yanmar 4JH80 turbocharged inboard diesel engines to repower 42ft to 52ft catamarans and cruising yachts. Marine yards choose this package for commercial workboat diesel engine repower installations in support tenders.

• Bosch common-rail direct fuel injection optimizes atomization to eliminate transom soot and smoke
• Turbochargers with seawater-cooled charge air intercoolers boost air density to maximize shaft torque
• Tubular freshwater heat exchangers protect internal cast iron water jackets from corrosive sea brine
• High-output 12V 125A marine alternators replenish large deep-cycle house battery banks during harbor transit
• NMEA 2000 CAN-bus data networks stream engine parameters straight to modern helm multifunction displays
• SAE 4 flywheel housings connect directly to Yanmar KM4A2, ZF 25A, or SD60 saildrives
• Parent bore cast iron cylinders maintain thermal stability under continuous heavy ocean motoring duty

Bench Dynamometer Load Test Output

Dynamometer test runs prove 80.0 BHP peak output at 3,200 RPM and 73.0 BHP continuous power at 3,107 RPM. Turbo boost pressure stabilizes at 1.30 bar during continuous full-power runs. Freshwater heat exchangers hold core coolant temperatures steady at 180°F under continuous thermal load. Engine oil pressure maintains 50 PSI across operational engine speeds. Shaftline installation permits up to 15° static inclination angles. Crankshaft journal runout remains below 0.0004in TIR to protect bearings against deflection fatigue. Exhaust temperatures stay below 1,080°F during full power runs.

Field Operation Maintenance Service Rules

Mechanical control linkages or electronic CAN-bus interfaces provide smooth throttle modulation with under 2 lbs of lever resistance. Do not install this 80.0 BHP turbocharged engine in heavy commercial displacement tugs, fast planing skiffs, or vessels lacking secondary 2-micron fuel water separator filtration. Operators must change fuel filters on schedule to safeguard common-rail components.

• Drain engine oil and change spin-on oil filter cartridges every 150 operating hours
• Inspect raw water pump impellers and check heat exchanger zinc anodes every 150 hours
• Replace the primary 2-micron fuel water separator filter cartridge every 250 engine hours

Factory Warranty Shipment Parts Manifest

Yanmar Marine provides a 2-Year limited warranty backed by 3-Year major component structural coverage. The shipment crate contains the 4JH80 diesel engine core, KM4A2 marine gearbox, high-output 12V 125A alternator, 1.4 kW starter motor, flexible vibration mounts, B20 instrument panel, wiring harness, and factory technical manuals.