Yanmar 4LHA-DTP – Inboard Marine Diesel Engine 200 HP

Using a verified mechanical direct fuel injection system, the Yanmar 4LHA-DTP delivers 200 horsepower from a 3.455-liter block. Operating at a governed 3300 RPM, this robust direct-injection system completely eliminates delicate electronic fuel sensors continuously. Forced enclosed lubrication utilizes an 11-liter oil sump. This actively protects moving components across varying dynamic operational loads in heavy seas. The dedicated turbocharger maximizes combustion oxygen density. It maintains highly responsive throttle performance across mid-range operating speeds without requiring complex digital air management setups inside harsh saltwater environments.

By circulating 11.5 liters of coolant, the closed freshwater heat exchanger system safely regulates internal block temperatures continuously. Raw seawater stays completely outside the internal engine cylinder waterways. This permanently prevents internal salt scaling and heavy metal corrosion. The native SAE 4 flywheel housing mounts seamlessly to HSW450A hydraulic marine gears. Auxiliary electrical systems rely on the standard 12V 60-amp alternator output for operation. Total dry weight registers at exactly 365 kg. Repower mechanics must factor this static physical mass into the vessel’s rear hull displacement center.

Engine Operation and Output

Maintaining strong combustion mechanically, this 3.455-liter Yanmar engine provides exceptional physical reliability in remote operating locations. An 11-liter oil sump ensures forced pressure lubrication during demanding continuous commercial runs. The rugged mechanical injection setup satisfies stringent IMO Tier II emissions limits internationally. This happens by utilizing an 18.4:1 compression ratio across the 1-3-4-2 firing order. Throttle synchronization runs directly through traditional mechanical push-pull cable linkages. This ensures immediate physical response during tight marina docking maneuvers and rapid heavy-duty shifting requirements under continuous load.

Why Choose the Yanmar 4LHA-DTP Inboard Diesel Engine

Workboat owners select the 4LHA-DTP inboard diesel engine for its substantial 3.455-liter displacement and dependable 200 horsepower output. Mechanical direct injection provides remarkably rugged running conditions compared to modern digitally governed units. Featuring a reliable 60-amp alternator, it effectively sustains basic DC circuits and essential navigation screens. The SAE 4 flywheel housing adapts immediately to HSW450A hydraulic transmissions or heavy HSW630A gears. Total dry weight remains strictly at 365 kg. This minimizes drastic center of gravity shifts inside your commercial vessel’s main engine room.

Warranty and Support

Yanmar supplies this 3.455-liter propulsion block with a standard Limited Factory Warranty covering major internal assembly defects. 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 accurately.

Before Ordering the Yanmar 4LHA-DTP Inboard Diesel Engine

Map your engine room hatch opening carefully to confirm adequate fitting clearance for this 365 kg block. You must verify your intended transmission reduction gear ratio and existing shaft coupling dimensions. Check that your onboard DC wiring system safely supports a 12V 60-amp alternator charging circuit output. Next, confirm whether your helm station supports required mechanical push-pull cables versus modern electronic control inputs. Ensure your existing diesel fuel filtration system matches the precise ISO 8217 DMA flow demands for mechanical direct injection networks precisely.