Yanmar 3JH5E – Inboard Marine Diesel Engine 39 HP

Description

With 39 hp at 3,000 rpm, the Yanmar 3JH5E uses a naturally aspirated 1.642L inline three-cylinder marine diesel configuration with indirect injection. Its 18.4:1 compression ratio and ISO 8217 DMA diesel requirement define the stated fuel-system setup. A mechanical cone-clutch transmission, SAE 4 flywheel housing, and KM35A2, KM35P, or SD50 drive compatibility establish the documented propulsion interfaces.

The 381-pound dry engine uses a 12V 80-amp alternator, heat-exchanger cooling with 4.5L coolant capacity, and forced lubrication holding 5.0L oil. A wet mixing elbow forms part of the specified exhaust system. Listed EPA Tier 3, RCD I, and BSO II ratings, along with mechanical or hydraulic steering compatibility, provide further technical context.

Key Specifications of the Yanmar 3JH5E Marine Diesel Engine

• The 1.642L inline three-cylinder engine produces 39 hp at 3,000 rpm through a naturally aspirated indirect-injection diesel configuration.
• Indirect injection and an 18.4:1 compression ratio define the specified fuel-system architecture using ISO 8217 DMA diesel.
• KM35A2, KM35P, and SD50 drive options require drivetrain compatibility review during propulsion replacement or vessel installation planning.
• A mechanical cone-clutch transmission pairs with the SAE 4 flywheel housing for the documented marine propulsion connection arrangement.
• The 12V 80-amp alternator provides the stated charging output for the engine electrical-system configuration.
• Heat-exchanger cooling holds 4.5L coolant, while the wet mixing elbow defines the specified exhaust-water arrangement.
• Forced lubrication uses 5.0L oil capacity, supporting planned fluid servicing within the engine-room installation layout.

Engine Configuration and Service Access

This Yanmar marine diesel engine uses an inline three-cylinder, four-stroke layout with 88 by 90 mm bore and stroke dimensions. The stated 1-3-2 firing order, 381-pound dry weight, and mechanical or hydraulic steering compatibility are relevant to engine-bed loading, controls, and service-space planning.

Fuel-system access, heat-exchanger plumbing, wet-exhaust routing, oil-service points, alternator wiring, and the chosen drivetrain should be assessed before engine placement. These systems remain important for maintenance access after the propulsion package is installed.

Why Choose the Yanmar 3JH5E Marine Diesel Engine

The 3JH5E marine diesel engine combines 39 hp at 3,000 rpm with a naturally aspirated 1.642L three-cylinder indirect-injection configuration. Buyers comparing mechanical propulsion packages can assess its 12V 80-amp alternator, SAE 4 flywheel housing, mechanical cone-clutch transmission, and KM35A2, KM35P, or SD50 drive options. The 381-pound dry weight and listed emissions ratings provide additional integration data.

Installation and Compatibility Considerations

Confirm that the vessel supports the 381-pound dry weight, SAE 4 flywheel housing, mechanical cone-clutch transmission, and selected KM35A2, KM35P, or SD50 drive configuration. Plan engine mounts, shaft or saildrive alignment, fuel supply, cooling-water intake, wet-exhaust routing, controls, charging wiring, ventilation, and service access before installation.

Use diesel meeting ISO 8217 DMA requirements. Confirm provisions for 4.5L coolant capacity, 5.0L oil capacity, mechanical or hydraulic steering compatibility, and access to fuel, cooling, lubrication, and exhaust service points according to applicable Yanmar documentation.

Warranty and Support

This model is eligible for Yanmar’s 3-Year Extended Limited Warranty program for first retail purchasers of qualifying engines bought on or after July 1, 2015, when used only for private and recreational purposes. For product details and order support, Mulmarine.com offers assistance before your purchase is placed. Current coverage information and warranty eligibility are available for review on Mulmarine.com before ordering.

Before Ordering the Yanmar 3JH5E Marine Diesel Engine

Before ordering, verify engine-bed dimensions, mount locations, SAE 4 flywheel-housing compatibility, and the selected KM35A2, KM35P, or SD50 drive arrangement. Confirm the vessel supports ISO 8217 DMA diesel, cooling-water intake, wet-exhaust routing, 12V charging wiring, mechanical or hydraulic controls, ventilation, shaft or saildrive alignment, and professional propulsion installation.