Yanmar 4JH80 Turbocharged Inboard Marine Diesel Engine

Description

Propel performance cruising sailing yachts via Yanmar 4JH80 Marine Diesel Engine packages, designed to power offshore cruising sailboats, catamarans, and coastal yachts up to 48 feet. Displacing 2.0 liters across four inline cylinders, this turbocharged diesel produces 80 horsepower at 3,200 RPM. Common-rail electronic fuel injection ensures quiet combustion, low smoke emissions, and smooth torque delivery.

High-tensile gray cast iron forms the monolithic cylinder block, equipped with induction-hardened parent cylinder walls that resist scuffing under boost. The fresh water cooling system integrates an aluminum heat exchanger housing with a cupronickel tube bundle, oil cooler, and bronze sea water pump. Dry weight without transmission is 496 lbs, supported by a 5.8-quart oil pan, SAE 4 housing, and 0.312-inch fuel line connections.

Key Features of Yanmar 4JH80

Cruising skippers buy Yanmar 4JH80 inboard engine packages to replace legacy mechanical diesels with modern common-rail electronic injection. The turbocharged four-cylinder configuration delivers massive low-end torque, allowing vessels to motor into ocean chop without laboring or creating excessive vibration inside living areas.

• 80 horsepower rating propels heavy displacement sailing craft at hull speed in head seas.
• 125-amp 12-volt alternator with built-in charging sensor recharges house battery banks.
• Common-rail electronic fuel injection operates at 1,800 bar to eliminate diesel exhaust smoke.
• Turbocharger increases air charge density to optimize thermal efficiency across cruising speeds.
• Cast iron block architecture provides structural strength for continuous offshore passages.
• Yanmar 4JH80 turbo efficiency lowers fuel burn on extended ocean passages.
• Heavy-duty vibration isolators absorb engine harmonics to protect boat stringer beds.
• Electronic Vessel Control integrates helm throttle, gear shifting, and digital engine diagnostics.

Combustion Dynamics Thermal Capacities

Dual thermostats regulate internal coolant temperatures between 172°F and 186°F under continuous motoring operations. The four-cylinder block develops 160 lb-ft of torque at 1,800 RPM, giving displacement sailboats power to punch through tidal headlands and harbor chop. Rated for M4 pleasure craft service, thermal heat rejection transfers 48 kW into raw water cooling circuits. Specific fuel consumption averages 218 g/kWh, burning about 1.35 gallons per hour at standard yacht cruising speeds across open coastal waters.

Exhaust Integration Bay Clearances

A water-cooled exhaust riser connects to 3.0-inch wet exhaust hose, meeting ABYC P-1 standards for auxiliary sailing craft. Mounting brackets adjust across 18-inch to 22-inch stringer centers, preserving 2.5 inches of clearance below the oil pan. Flexible elastomer mounts absorb vibration from the hull.

Service Schedules Application Constraints

Electronic CAN-bus control levers connect straight to the engine control unit for instantaneous transmission engagement. Operators inspect raw water strainers, check oil levels, and monitor belt tension before getting underway. This engine package is not engineered for offshore planing hulls, commercial trawlers, or raw water cooled bilges without fresh water heat exchangers.

• Inspect sea water intake strainer before each shift.
• Inspect and clean heat exchanger zincs every 150 hours.
• Change engine lube oil, gear oil, and filters every 250 hours.

Warranty Terms Package Manifest

Recreational buyers receive 2-Year limited warranty protection on base castings and mechanical components. The shipping crate contains the bobtail engine package, vibration isolators, digital B25 instrument cluster, five-meter extension wiring harness, oil extraction pump, and a complete technical service manual.