Yanmar 3YM30AE – Inboard Marine Diesel Engine 29 HP

Description

With 29 hp at 3,200 rpm, the Yanmar 3YM30AE uses a naturally aspirated 1.266L inline three-cylinder marine diesel layout with indirect injection. Its 19.1:1 compression ratio and ISO 8217 DMA diesel requirement define the stated fuel-system configuration. A mechanical cone-clutch transmission, SAE 5 flywheel housing, and KM2P-1 or SD25 saildrive compatibility establish the documented propulsion interfaces.

The 280-pound dry engine uses a 12V 125-amp alternator, heat-exchanger cooling with 4.9L coolant capacity, and forced lubrication holding 2.8L oil. The wet mixing elbow forms part of the exhaust arrangement. Listed EPA Tier 3, RCD II, and BSO II ratings, plus mechanical or hydraulic steering compatibility, provide further specification context.

Key Specifications of the Yanmar 3YM30AE Marine Diesel Engine

• The 1.266L inline three-cylinder engine produces 29 hp at 3,200 rpm through a naturally aspirated indirect-injection diesel configuration.
• Indirect injection and a 19.1:1 compression ratio define the specified fuel-system architecture using ISO 8217 DMA diesel.
• KM2P-1 and SD25 saildrive options require drivetrain compatibility review during propulsion replacement or new-vessel installation planning.
• A mechanical cone-clutch transmission pairs with the SAE 5 flywheel housing for the documented marine propulsion connection arrangement.
• The 12V 125-amp alternator provides the stated charging output for the engine electrical-system configuration.
• Heat-exchanger cooling holds 4.9L coolant, while the wet mixing elbow defines the specified exhaust-water arrangement.
• Forced lubrication uses 2.8L 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 configuration with 80 by 84 mm bore and stroke dimensions. The stated 1-3-2 firing order and 280-pound dry weight are relevant when planning engine-bed loading and service space around the installed unit.

Fuel-system components, heat-exchanger connections, lubrication-service points, alternator wiring, wet-exhaust routing, and the selected mechanical or saildrive transmission should remain accessible after the completed installation.

Why Choose the Yanmar 3YM30AE Marine Diesel Engine

The 3YM30AE marine diesel engine combines 29 hp at 3,200 rpm with a naturally aspirated 1.266L three-cylinder indirect-injection configuration. Buyers comparing compact propulsion packages can assess its 12V 125-amp alternator, mechanical cone-clutch transmission, SAE 5 flywheel housing, and KM2P-1 or SD25 saildrive compatibility. The 280-pound dry weight and listed emissions ratings provide additional integration data.

Installation and Compatibility Considerations

Confirm that the vessel supports the 280-pound dry weight, SAE 5 flywheel housing, mechanical cone-clutch transmission, and selected KM2P-1 or SD25 saildrive 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 4.9L coolant capacity, 2.8L oil capacity, mechanical or hydraulic steering compatibility, and access to fuel, cooling, lubrication, and exhaust components under the applicable Yanmar documentation.

Warranty and Support

Warranty coverage for this legacy engine should be confirmed against the current Yanmar policy applicable to its purchase date, installation status, and operating market. Mulmarine.com provides product-information support before purchase and assistance with order-related questions. Review current warranty eligibility and coverage details on Mulmarine.com before placing your order.

Before Ordering the Yanmar 3YM30AE Marine Diesel Engine

Before ordering, verify engine-bed dimensions, mount locations, SAE 5 flywheel-housing compatibility, and the selected KM2P-1 or SD25 saildrive 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.