Yanmar 8LV-370Z Sterndrive Marine Diesel Engine

Description

Halt excessive offshore fuel consumption with the Yanmar 8LV-370Z Sterndrive Marine Diesel Engine. This 4.46-liter twin-turbocharged V8 four-stroke marine engine outputs 370 brake horsepower at 3,800 RPM. Common-rail diesel injection pairs with a matched hydraulic clutch sterndrive to furnish clean throttle pickup and high cruise efficiency, providing offshore boaters immediate acceleration without unburned smoke during aggressive planing maneuvers.

A rigid compacted graphite iron block casting provides high tensile strength under marine thermal stress. Dual overhead camshafts actuate four valves per combustion chamber inside heat-treated aluminum cylinder heads. Internal components feature a micro-finished forged steel crankshaft, forged 4340 alloy connecting rods, and oil-jet cooled forged aluminum pistons. Critical specifications encompass an 86 mm bore, 96 mm stroke, 16.5:1 compression ratio, 10.6-quart wet oil pan volume, and a bare dry weight of 992 lbs.

Key Features of Yanmar 8LV-370Z

Offshore performance boaters buy Yanmar 8LV-370Z crate engine systems to convert high-maintenance gasoline stern drives into high-torque diesel platforms. This sterndrive configuration fits sport cruisers, deep-V tenders, and offshore day boats requiring fast acceleration.

• 1,600-bar Denso high-pressure common-rail injection provides exact fuel metering across all engine loads.
• Dual water-cooled twin turbochargers generate swift boost pressures to lift stepped hulls out of the water.
• ZT370 hydraulic multi-plate clutch sterndrive enables silent, clunk-free gear shifts during dock maneuvers.
• Dual counter-rotating sterndrive propellers maximize water grip and eliminate steering torque steer under hard acceleration.
• 8LV-370Z sterndrive marine engine electronic steering tie-ins link straight into modern CAN-bus vessel helm controls.
• 12-volt 180-amp marine alternator charges house battery banks and drives high-demand navigation radar units.
• Closed liquid cooling heat exchanger shields marine engine components from harsh salt water exposure.

Sterndrive Dynamometer Performance Metrics

Dyno testing maps an active powerband from 550 idle RPM through 3,800 peak RPM. The dual-turbo package generates 370 brake horsepower at 3,800 RPM and 590 lb-ft torque at 2,200 RPM. Overhead camshaft geometry drives hydraulic roller followers to yield 0.335-inch total intake valve lift. Direct common-rail injectors meter 91-cetane ultra-low sulfur marine diesel into toroidal piston bowls. Engine galleys regulate oil pressure between 45 and 70 PSI hot, preventing bearing scuffing during full-throttle ocean runs at top sterndrive trim.

Transom Shield Sterndrive Interface

The rear engine bellhousing bolts straight to the Yanmar ZT370 transom shield through an internal neutral balance drive coupler. Front accessory pulleys require five inches of forward bulkhead clearance. Engine mounts align with standard transom stringer rails, while the low-profile top intake plenum maintains three inches of vertical hatch clearance inside standard engine compartments.

Sterndrive Marine Maintenance Schedule

Prime engine oil galleries using a manual priming pump prior to initial sea trials. Bleed closed-circuit cooling lines to eliminate air bubbles around the turbochargers. This sterndrive engine package is not engineered for unapproved high-sulfur home heating fuels, surface-piercing racing drives, or dry-sump racing offshore catamarans.

• Replace crankcase lube oil and change fuel filters after the initial 50 hours of hull operation.
• Grease sterndrive gimbal bearings and examine transom bellow seals every 100 hours or each season.
• Flush sterndrive gear lube and replace sacrificial zinc anodes every 12 months.

Sterndrive Package Crate Inventory

Yanmar protects this sterndrive package with a 24-Month / 1,000-Hour limited pleasure craft warranty. The wooden shipping crate holds the dressed V8 diesel long block, ZT370 hydraulic sterndrive unit, transom shield unit, engine mounts, VC10 digital harness, factory dynamometer certificate, and technical installation manual binder guides.