Yanmar 4JH5E – Inboard Marine Diesel Engine 53 HP

With 53 hp at 3,000 rpm, the Yanmar 4JH5E is an inline four-cylinder, naturally aspirated marine diesel with 2.19L displacement. Indirect injection and an 18.4:1 compression ratio define its specified fuel-system configuration, while the heat-exchanger cooling system and wet mixing elbow form part of the documented marine installation arrangement. Compatible drive options include KM35A2, KM35P, and SD50 configurations.

The 443-pound dry engine uses an SAE 4 flywheel housing and a mechanical cone-clutch transmission. A 12V, 80-amp alternator supports the stated electrical output, while forced lubrication uses 5.0L oil capacity and the cooling system holds 7.2L. The engine is listed with EPA Tier 3, RCD I, and BSO II emissions ratings.

Why Choose the Yanmar 4JH5E Marine Diesel Engine

The 4JH5E marine diesel engine combines 53 hp at 3,000 rpm with a naturally aspirated 2.19L inline four-cylinder configuration. Buyers comparing mechanical propulsion packages can assess its indirect injection, 12V 80-amp alternator, SAE 4 flywheel housing, and KM35A2, KM35P, or SD50 drive compatibility. Its 443-pound dry weight, heat-exchanger cooling, and listed emissions ratings provide additional installation-planning data.

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. provides product-information support before purchase and assistance with order-related questions. Review warranty eligibility and current coverage details on before placing your order.

Before Ordering the Yanmar 4JH5E Marine Diesel Engine

Before ordering, verify your vessel’s engine-bed dimensions, mount locations, shaft or saildrive arrangement, SAE 4 flywheel-housing compatibility, and KM35A2, KM35P, or SD50 drive requirements. Confirm your fuel system supports ISO 8217 DMA diesel, and plan cooling-water intake, exhaust routing, control cables, 12V wiring, ventilation, and professional installation requirements.