Yanmar 8LV-320Z – Marine Diesel Engine 320 HP

Connecting a high-torque V8 engine block directly to a ZT370 sterndrive leg is straightforward with the Yanmar 8LV-320Z. This 4.46-liter twin-turbocharged motor delivers 320 horsepower at 3800 RPM, giving fast express cruisers and sportfishing hulls rapid acceleration. High-pressure common-rail fuel injection provides clean, quiet combustion, while an integrated hydraulic clutch inside the drive assembly ensures smooth gear engagement during tight harbor docking maneuvers.

A closed heat exchanger cooling loop protects internal cylinder passages from raw seawater exposure. The electrical package includes a 12V 180-amp alternator for high charging demand, VC10 electronic vessel controls, and a dry weight of 495 kg including the drive unit.

Engine Performance and Engineering

V8 cylinder geometry combined with common-rail fuel management creates a quiet, responsive power package in this Yanmar inboard engine. Twin intercooled turbos feed high-density air into the 4.46-liter block, while VC10 electronic vessel controls manage digital throttle synchronization for twin-engine helm stations.

Why Choose the Yanmar 8LV-320Z Marine Diesel Propulsion Engine

Boat owners choose the 8LV-320Z marine engine for its integrated ZT370 sterndrive coupling and smooth 320 horsepower output. Its twin-turbocharged V8 architecture provides quick planing performance without typical diesel exhaust smoke. The combination of common-rail injection, a 180-amp alternator, and closed heat exchanger cooling makes it an ideal repower option for fast express cruisers.

Warranty and Support

Yanmar backs this sterndrive diesel package with a 2-Year Limited Recreational Warranty covering major engine block and drive assembly components. provides product-information support before purchase and assistance with order-related questions. Prior to freight shipment, staff verify the crated engine package against the confirmed order details. Review warranty eligibility and current coverage details on before placing your order.

Before Ordering the Yanmar 8LV-320Z Marine Diesel Propulsion Engine

Measure your engine compartment and transom shield area to confirm mounting clearance for a V8 sterndrive package. Verify your fuel line delivery diameter, return line routing, and battery cold cranking amps meet manufacturer requirements before completing your order.