Universal Kubota 5424 Marine Diesel Engine

The Universal Kubota 5424 Marine Diesel Engine is a compact and dependable inboard marine diesel engine engineered to deliver reliable propulsion for sailboats and small to medium vessels. Built on Kubota’s proven industrial diesel platform and adapted for marine use by Universal, the 5424 is known for its durability, fuel efficiency, and smooth performance in a wide range of operating conditions.

Engine Design & Construction

The 5424 features a 3-cylinder, 4-stroke diesel configuration with direct fuel injection, providing consistent power output and strong low-end torque for marine propulsion. Its robust construction and high-quality components are designed to withstand continuous operation in harsh marine environments, ensuring long service life and dependable performance.

A freshwater cooling system with heat exchanger protects internal engine components from saltwater corrosion and maintains optimal operating temperatures. The compact engine layout allows easy installation in limited engine compartments while preserving good access for routine maintenance.

Performance & Efficiency

Delivering approximately 24 horsepower, the Universal Kubota 5424 offers smooth and efficient power ideal for cruising, docking, and auxiliary sailing operations. The engine is optimized for low fuel consumption, making it an economical choice for extended cruising and everyday marine use.

Its well-balanced design reduces vibration and noise, contributing to improved onboard comfort during long voyages.

Marine Integration

Designed specifically for inboard marine applications, the Universal Kubota 5424 is compatible with marine gearboxes and conventional shaft drive systems. Its flexible installation options make it suitable for a variety of hull designs, including sailboats and small yachts.

Ease of Maintenance & Reliability

The Universal Kubota 5424 is valued for its simple, service-friendly design. Routine service points such as oil and fuel filters, belts, and cooling system components are easily accessible, helping reduce maintenance time and costs. Based on Kubota’s globally supported diesel platform, spare parts availability remains strong, ensuring long-term serviceability.

Ideal Applications

The Universal Kubota 5424 Marine Diesel Engine is ideal for:

• Sailboats and auxiliary propulsion systems

• Small cruising yachts

• Coastal and inland waterway vessels

• Boat owners seeking a reliable, low-maintenance diesel engine

Key Advantages

• Proven Kubota diesel reliability adapted for marine use

• Compact and space-efficient design

• Fuel-efficient 3-cylinder direct injection engine

• Freshwater cooling with heat exchanger

• Smooth, low-vibration operation

• Easy maintenance and strong parts availability

Technical Specifications

General

• Model: Universal Kubota 5424

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

• Fuel System: Direct fuel injection

• Aspiration: Naturally aspirated

• Number of Cylinders: 3 (inline)

• Base Engine: Kubota industrial diesel (marine adapted)

Displacement & Combustion

• Displacement: Approx. 1.12 L

• Bore × Stroke: Approx. 76 mm × 73.6 mm

• Combustion Chamber: Direct injection diesel

Performance

• Rated Power: 24 HP (17.9 kW)

• Rated Speed: 3,000 RPM

• Maximum Torque: Approx. 63 Nm @ mid-range RPM

• Operating Range: Optimized for low to mid RPM marine operation

• Fuel Consumption: Economical, dependent on load and propeller match

Cooling & Lubrication

• Cooling System: Freshwater cooling with heat exchanger

• Lubrication System: Forced lubrication with gear-type oil pump

• Engine Oil Capacity: Approx. 4.5 liters

• Recommended Oil Type: Marine-grade diesel engine oil

Electrical System

• Starting System: 12 V electric start

• Starter Motor Output: Approx. 1.2–1.4 kW

• Alternator: 12 V marine alternator

• Battery Charging: Standard onboard charging capability

Dimensions & Weight

• Overall Dimensions (L × W × H):
  Approx. 720 × 500 × 600 mm

• Dry Weight: Approx. 160–170 kg (engine only, excluding gearbox)

Drive & Installation

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

• Drive Type: Inboard marine shaft drive

• Compatible Gearbox: Marine transmission compatible with small inboard engines

• Mounting: Flexible engine mounts for vibration reduction

Service & Adjustment

• Valve Clearance (Cold):

  • Intake: ~0.20 mm

  • Exhaust: ~0.20 mm

• Firing Order: 1 – 2 – 3

• Maintenance Access: Easy access to filters, belts, and service points