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Yanmar 8LV-320Z – Marine Diesel Engine 320 HP
Yanmar 8LV-320Z – 320 HP features a flagship 4.5L V8 propulsion system specifically paired with the Yanmar ZT370 hydraulic clutch sterndrive for elite maneuverability. This 320 HP sterndrive configuration delivers precision docking and rapid acceleration through counter-rotating propellers, making it the premier choice for luxury express cruisers and sporty dayboats requiring refined diesel performance.
- Transom/Engine Integration Specification: Sterndrive Configuration (ZT370 Drive).
- Core Engine Mechanical Design: V8 90-Degree 4.46L Turbocharged.
- High Precision Fuel Induction: Electronic Common Rail with Digital EVC.
- Optimal Marine Vessel Compatibility: Perfect for express cruisers and high-performance dayboats.
- Long Term Warranty Coverage: Yanmar limited manufacturer warranty.
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Description
Yanmar 8LV-320Z 320 HP – Sterndrive Diesel Propulsion System
Integrating high-torque diesel performance with the maneuverability of a sterndrive unit is the mechanical solution provided by the Yanmar 8LV-320Z. Specifically engineered for the ZT370 hydraulic clutch sterndrive, this 320 HP V8 package solves the problem of sluggish throttle response in heavy American sterndrive cruisers. The twin-turbocharged system ensures a flat torque curve, allowing for effortless planing even when the vessel is heavily loaded with fuel and gear for weekend trips.
Adhering to USA EPA Tier 3 standards, the 8LV-320Z combines eco-friendly operation with the rugged durability required for American coastal patrol and recreational use. The inclusion of the ZT370 drive provides exceptionally smooth gear shifting due to its hydraulic clutch design, reducing the “clunk” typically found in mechanical sterndrives. With a 180A alternator and NMEA 2000 compatibility, this engine package is designed for the high-tech demands of modern USA marine navigation systems.
Core Technical Specifications
- Maximum Output: 320 HP at 3800 RPM.
- Drive System: ZT370 hydraulic clutch sterndrive.
- Displacement: 272 cubic inches (4.46 Liters).
- Configuration: V8, 4-stroke, water-cooled diesel.
- Aspiration: Twin-turbocharged with intercooler.
- Electrical: 12V / 180A high-output alternator.
- Compliance: EPA Tier 3 emission certified.
- Control System: Yanmar VCS fly-by-wire compatible.
Yanmar 8LV-320Z Full Specs
| Engine type | V8, 4-stroke, Water Cooled Diesel |
| Displacement | 4.46L (272 cid) |
| Bore x stroke | 86 x 96 mm |
| Horsepower | 320 hp (235 kW) |
| Rated rpm | 3800 rpm |
| Aspiration | Twin Turbocharged & Intercooled |
| Compression ratio | 15.8:1 |
| Fuel system | Common Rail Injection |
| Recommended fuel | Diesel (EN 590) |
| Ignition/Firing Order | Compression / 1-2-7-3-4-5-6-8 |
| Alternator | 12V, 180 Amp |
| Gear ratio/Drive | ZT370 Sterndrive |
| Transmission | Hydraulic Clutch (Integrated) |
| Dry weight | 495 kg (1091 lbs) |
| Flywheel housing | SAE 3 |
| Steering | Electronic Control (VC10) |
| Coolant capacity | 12L |
| Exhaust system | Water cooled riser |
| Cooling system | Heat Exchanger |
| Lubrication | Forced lubrication |
| Oil capacity | 11.5L |
| Emissions rating | EPA Tier 3, RCD II, IMO II |
Yanmar 8LV-320Z Service & Performance Guide
What is the fuel consumption of the Yanmar 8LV-320Z?
The 8LV-320Z consumes 16.8 gallons per hour at its maximum 3,800 RPM, optimized specifically for Z-drive stern applications. The engine's electronic management adjusts fuel maps to compensate for the specific load characteristics of the outdrive. Constant monitoring of the fuel-water separator is essential to maintain high-pressure common rail integrity.
What oil grade is required for the Yanmar 8LV-320Z?
This Z-drive variant requires 10.6 quarts of SAE 15W-40 oil meeting API CJ-4 standards for high-speed diesel engines. The stern drive unit itself requires separate gear-specific lubrication that must be checked according to the drive manufacturer's manual. Change engine oil every 250 hours to ensure optimal protection of the V8 assembly.
How does the Yanmar 8LV-320Z cooling system operate?
The engine uses a freshwater cooling loop with a seawater-cooled heat exchanger, specifically designed for stern drive water intakes. Seawater is drawn through the Z-drive leg or a hull-mounted pickup to cool the engine's internal heat exchanger. Regularly inspect the intake bellows and water hoses for cracks or marine growth obstructions.
What are the electrical system specifications for this engine?
A high-output 12V-180A alternator is standard, providing critical power for the Z-drive's electronic trim and tilt actuators. This system ensures that both the engine electronics and vessel house batteries stay fully charged during low-speed maneuvering. All electrical components are ignition-protected to meet USCG and ABYC safety standards for marine use.
What are the physical dimensions and weight of the 8LV-320Z?
The engine weight is 992 lbs, but the total package weight varies based on the specific Z-drive model attached. It measures 45.4 inches long, making it a compact choice for stern-drive sportboats and cruisers. Allow for extra transom clearance to accommodate the steering rams and trim hose assemblies during installation.
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