Yanmar 3JH2CE Marine Diesel Engine

The Yanmar 3JH2CE Marine Engine is a compact and reliable 4-stroke marine diesel engine engineered to deliver dependable propulsion for sailboats and small to medium-size power vessels. Built on Yanmar proven marine diesel technology, the 3JH2CE is widely recognized for its durability, fuel efficiency, and smooth operational performance in demanding marine environments.

Engine Design & Construction

The 3JH2CE features a three-cylinder, inline diesel configuration with direct fuel injection, providing strong low-end torque and consistent power output across the operating range. Its freshwater cooling system with heat exchanger ensures stable engine temperatures and long-term reliability, even in saltwater conditions. The engine block and major components are constructed from high-quality materials to resist corrosion and wear, making it suitable for long-term marine use.

Performance & Output

Rated at approximately 38 horsepower at 3,600 RPM, the Yanmar 3JH2CE delivers balanced performance for cruising, maneuvering, and auxiliary propulsion. The engine’s torque characteristics support smooth acceleration and steady cruising speeds, while maintaining economical fuel consumption. This makes it ideal for vessels that require dependable power without excessive operating costs.

Marine Compatibility

Designed specifically for marine propulsion, the 3JH2CE is compatible with marine gearboxes and shaft drive systems, allowing flexible installation across a wide range of vessel types. Its compact size and efficient layout enable installation in confined engine rooms while still allowing access for routine inspection and servicing.

Operational Efficiency

The direct injection system enhances combustion efficiency, contributing to reduced fuel consumption and reliable cold starting. A 12-volt electric starting system and onboard charging capability support modern onboard electrical needs, making the engine suitable for extended cruising and auxiliary power demands.

Maintenance & Reliability

Ease of maintenance is a key advantage of the Yanmar 3JH2CE. Service points such as filters, belts, and pumps are positioned for accessibility, reducing downtime and simplifying routine maintenance. Thanks to Yanmar’s long-standing reputation and global presence, spare parts availability remains strong, supporting long service life and consistent performance.

Ideal Applications

The Yanmar 3JH2CE is well-suited for:

• Sailboats and cruising yachts

• Auxiliary propulsion systems

• Small to medium displacement vessels

• Coastal and offshore recreational use

Key Advantages

• Proven Yanmar marine diesel reliability

• Compact and space-efficient design

• Fuel-efficient 3-cylinder direct injection engine

• Smooth operation with dependable torque output

• Designed for long service life in marine environments

Technical Specifications

General

• Model: Yanmar 3JH2CE

• Engine Type: 4-stroke, vertical, water-cooled marine diesel

• Fuel System: Direct injection

• Aspiration: Naturally aspirated

• Number of Cylinders: 3 (inline)

• Displacement: 1,363 cc (1.36 L)

• Bore × Stroke: 82 mm × 86 mm

• Combustion Chamber: Direct injection diesel

Performance

• Maximum Output: 38 HP (28.5 kW) @ 3,600 RPM

• Continuous Output: 35 HP (25.7 kW) @ 3,400 RPM

• Maximum Torque: Approx. 78 Nm @ 3,000 RPM

• Rated Speed: 3,600 RPM

• Fuel Consumption: Approx. 200 g/HP/hr (at rated output)

Cooling & Lubrication

• Cooling System: Freshwater cooling with heat exchanger

• Lubrication System: Forced lubrication with trochoid oil pump

• Engine Oil Capacity: Approx. 4.9 liters

• Lubrication Oil Pressure: 3.5 – 4.5 kgf/cm² (at rated speed)

Electrical System

• Starting System: 12 V electric starter

• Starter Motor Output: Approx. 1.4 kW

• Alternator Output: 12 V / 55 A

• Charging System: Belt-driven alternator

Dimensions & Weight

• Overall Dimensions (L × W × H):
  Approx. 782 × 511 × 587 mm

• Dry Weight: Approx. 165 kg (engine only, without gearbox)

Drive & Installation

• Rotation (Crankshaft): Counter-clockwise (viewed from flywheel)

• Mounting Flange: SAE #5

• Compatible Gearbox: Marine constant-mesh gearbox (commonly KBW series)

• Propeller Shaft Rotation: Clockwise (viewed from stern)

Service & Adjustment

• Valve Clearance (Cold):

  • Intake: 0.20 mm

  • Exhaust: 0.20 mm

• Fuel Injection Timing: Approx. 14° BTDC

• Injection Pressure: Approx. 200 kg/cm²

• Firing Order: 1 – 3 – 2