Yanmar 8LV-370 Inboard Shaft Marine Diesel Engine

Description

Propel offshore sport fishing vessels with the Yanmar 8LV-370 Marine Diesel Engine. This 4.46-liter twin-turbocharged V8 four-stroke inboard diesel generates 370 brake horsepower at 3,800 RPM. Common-rail fuel injection combines with dual water-cooled turbochargers to furnish clean torque across mid-range cruise points, providing offshore cruisers direct throttle response without diesel exhaust smoke during cold dockside starts.

A rigid compacted graphite cast iron 90-degree V8 block anchors the rotating group under extreme marine cylinder pressures. Four valves per cylinder top aluminum cylinder heads driven by twin overhead camshafts. The crank train integrates a balanced forged steel crankshaft, forged connecting rods, and oil-cooled aluminum pistons. Engine measurements feature an 86 mm bore, 96 mm stroke, 16.5:1 compression ratio, 10.6-quart oil sump capacity, and dry engine weight of 992 lbs.

Key Features of Yanmar 8LV-370

Boatbuilders buy Yanmar 8LV-370 crate engine packages to re-power express cruisers and offshore sport fishing vessels. The balanced V8 architecture installs straight onto stringer mounts to replace heavy cast-iron marine engines.

• 1,600-bar common-rail Denso injectors discharge fine diesel mist for smoke-free dock operation.
• Dual water-jacketed turbochargers build instantaneous boost to push planning hulls on plane without lag.
• 32-valve cylinder heads maximize airflow charge through dual overhead camshaft tracks across high engine RPM.
• 12-volt 180-amp high-output alternator feeds onboard marine house banks and electronic navigation suites without interruption.
• 8LV-370 inboard marine engine CAN-bus VC10 electronic control interfaces straight into helm multifunction displays.
• Closed fresh-water heat exchanger system shields raw sea brine from inner cast iron coolant channels.
• 8-inch low-profile oil pan clears vessel stringers while maintaining continuous oil pick-up lubrication during swells.

Dynamic Marine Torque Verification

This marine diesel operates across an active 550 to 3,800 RPM powerband. Certified dyno tests confirm 370 brake horsepower output at 3,800 RPM and 590 lb-ft torque at 2,200 RPM. Dual overhead camshaft profiles open four valves per cylinder through direct hydraulic followers with 0.335-inch valve lift. The common-rail injection system burns standard ultra-low sulfur marine diesel fuel. Internal oiling galleys maintain 45 to 70 PSI hot oil pressure under continuous cruising throttle, keeping main journals protected during multi-hour offshore canyon runs.

Hull Stringer Transmission Fitment

Engine mounts drop onto standard 22.5-inch marine stringer centers. The rear flywheel housing mates straight to standard marine transmissions including ZF 63A down-angle gearboxes through internal neutral balance torsional dampener plates. The front water pump and belt drive maintain four inches of clearance ahead of vessel bulkheads, while bottom oil pan clearances fit standard inboard keel sumps.

Marine Maintenance Break In Protocol

Pre-lubricate oil passages using high-pressure priming tools prior to first ignition. Fill the internal closed loop with pre-mixed marine long-life coolant to prevent air pockets. This engine is not engineered for raw sea water direct block cooling, unapproved racing fuels, or high-sulfur diesel stocks.

• Drain factory run-in oil and replace oil filter elements after the first 50 hours of vessel operation.
• Inspect raw water pump rubber impellers and clean sea strainers every 250 hours or each season.
• Check valve lash clearances and test heat exchanger sacrificial zinc anodes every 12 months.

Factory Warranty Crate Manifest

Each engine carries a 24-Month / 1,000-Hour Yanmar limited pleasure craft warranty. The wooden freight crate contains the complete bobtail marine diesel engine, 180-amp alternator, closed heat exchanger, flexible marine isolation mounts, engine wiring loom, factory test certificate, and technical owner service manual documentation binder.