Yanmar 4LV170 – Marine Diesel Engine 170 HP

For electrical systems demanding significant house bank charging, the Yanmar 4LV170 utilizes a standard 12V 130-amp alternator. Producing 170 horsepower at a governed 3500 RPM, this 2.755-liter in-line 4 marine diesel operates efficiently. A high-pressure common-rail injection system completely eliminates heavy mechanical idle clatter inside the cabin. Forced enclosed lubrication relies on an 8.5-liter oil sump. This actively protects moving components across varying dynamic operational loads. The dedicated turbocharger maximizes combustion oxygen density. It maintains highly responsive throttle performance across mid-range operating speeds flawlessly.

The 9-liter closed-loop coolant setup prevents internal salt scaling by keeping raw seawater outside the internal block. This safely regulates internal block temperatures across varying RPM ranges. It stops related heavy metal corrosion inside the cylinder waterways permanently. For electrical demands, the high-output alternator replenishes heavy house battery banks efficiently during extended voyages. The native SAE 4 flywheel housing mounts effortlessly to KMH50A gears. A dry weight of just 334 kg minimizes the overall propulsion load affecting your vessel’s rear displacement geometry completely.

Engine Operation and Output

Delivering fuel via precise digital mapping, this 2.755-liter Yanmar engine provides excellent power density within a tight dimensional layout. An enclosed forced lubrication circuit pumps oil through an 8.5-liter sump during demanding operational runs. The high-pressure common-rail setup satisfies stringent EPA Tier 3, RCD II, and IMO II emissions limits automatically. This happens by continuously adjusting injection timing based on exact load parameters. Throttle inputs communicate directly through the VC10 electronic control system. This bypasses traditional mechanical push-pull cable friction issues during docking maneuvers.

Why Choose the Yanmar 4LV170 Inboard Diesel Engine

Marine technicians select the 4LV170 marine diesel engine for its compact 2.755-liter configuration and dependable 170 horsepower output. Electronic common-rail injection provides incredibly clean running conditions compared to older mechanically governed units. Featuring a massive 130-amp alternator, it easily runs large DC refrigeration compressors or navigation screens. The SAE 4 flywheel housing adapts immediately to KMH50A transmissions or KMH50V V-drive configurations. Total dry weight stays at 334 kg. This actively avoids drastically shifting your vessel’s center of gravity after final heavy machinery installation.

Warranty and Support

Purchasing this 2.755-liter propulsion block secures a standard Limited Factory Warranty covering major internal assembly defects from Yanmar. provides essential product-information support before purchase and technical assistance with order-related questions. A thorough pre-shipment visual inspection confirms the crated engine item and all documented included components. Mechanics and vessel owners should examine warranty coverage scope concerning specific commercial versus recreational duty cycles. Please review the detailed warranty coverage and eligibility details directly on before placing your final heavy freight purchase order properly.

Before Ordering the Yanmar 4LV170 Inboard Diesel Engine

Verify your engine room hatch opening carefully to confirm adequate fitting clearance for this 334 kg block. You must ascertain your intended transmission reduction gear ratio and existing shaft coupling layout. Check that your onboard DC wiring system safely supports a 12V 130-amp alternator charging circuit output. Next, confirm whether your helm station supports native VC10 electronic control inputs versus legacy mechanical push-pull cables. Ensure your existing diesel fuel filtration system matches the precise EN 590 flow demands for common-rail injection networks actively.