Description

Yanmar 4JH3-DTE 125 HP Marine Diesel Inboard

The Yanmar 4JH3‑DTE is a high‑performance 4‑stroke, 4‑cylinder marine diesel engine delivering 125 HP (91.9 kW) at 3800 rpm, engineered to provide reliable, fuel‑efficient power for a wide range of inboard boating applications, from pleasure craft to larger displacement vessels. Its turbocharged and intercooled design enhances combustion efficiency and responsiveness, while the direct injection fuel system with Bosch VE pump ensures precise fuel delivery and strong torque across operating conditions.

Built with a vertical, water‑cooled configuration, the 4JH3‑DTE delivers smooth, quiet, and durable operation, helped by a freshwater cooling system with heat exchanger that maintains steady engine temperatures in varied marine environments. The engine comes with a 12 V electric starter and 125 A alternator, flexible mounts, expansion tank, and essential components like the exhaust mixing elbow and electric stop solenoid in the standard package.

Designed for ease of installation and service, this Yanmar inboard engine features mechanical controls, a compact footprint, and international emissions and safety certifications including RCD 1, EPA Tier 2, BSO II, EMC, and SOLAS compliance. Optional accessories such as extended wire harnesses, dual station controls, sidemount control heads, and high‑riser mixing elbows allow tailoring the installation to specific vessel needs.

Whether for coastal cruising, live‑aboard comfort, or dependable diesel propulsion for workboats, the 4JH3‑DTE balances power, fuel efficiency, durability, and ease of ownership — backed by Yanmar’s global reputation for quality marine diesel engines.

Specifications:

Combustion System: Direct Injection
Cylinders: 4
Direction Of Rotation [Crankshaft]: Counterclockwise Viewed From Stern
Lubrication System: Enclosed, Forced Lubricating System
Starting System: Electric Starting 12V – 1.4 kW
Configuration: 4-Stroke, Vertical, Water-Cooled Diesel Engine
Maximum Output At Crankshaft: * 89.1 kW@3800 rpm [121 mhp@3800 rpm], ** 91.9 kW@3800 rpm [125 mhp@3800 rpm]
Displacement: 1.995 ltr [122 cu in]
Bore X Stroke: 84 mm x 90 mm [3.31 in x 3.54 in]
Aspiration: Turbocharged With Intercooler
Alternator: 12V – 80A
Cooling System: Fresh Water Cooling By Centrifugal Fresh Water Pump And Rubber Impeller Sea Water Pump
Dry Weight Without Gear: 229 kg [504.8 lbs]
Engine Mounting: Rubber Type Flexible Mounting
Factory Warranty: 5 Years

Package Include:

Set of flexible mounts
Exhaust mixing elbow [L-type]
Belt safety cover
Expansion tank for fresh water cooling system
Alternator 12V – 125A
Electric stop solenoid
Operation manual
B20-panel
Sensor for instrument panel
Choice Of Transmissions: KMH4A [down angle: 8º] or ZF25A [down angle: 8º]