Westerbeke 44B Four Marine Diesel Engine

The Westerbeke 44B Four Diesel Engine is a robust, high-performance inboard marine diesel engine designed for small to medium-sized vessels requiring reliable auxiliary propulsion. Known for its durability and smooth operation, the 44B Four is part of Westerbeke renowned series of marine engines, widely trusted by sailors, boat owners, and marine professionals.

Engine Design & Construction

The 44B Four features a 4-cylinder, 4-stroke diesel configuration with direct fuel injection, providing consistent torque and reliable power across a wide range of RPM. Built with a heavy-duty engine block and precision-engineered components, it is designed to endure continuous operation in demanding marine environments while maintaining long service life.

Equipped with a freshwater cooling system and heat exchanger, the engine ensures optimal operating temperatures and protection against corrosion, making it ideal for saltwater and coastal applications. Its compact design allows for installation in tight engine compartments without compromising access for maintenance.

Performance & Efficiency

Delivering approximately 44 horsepower, the Westerbeke 44B Four provides smooth and consistent propulsion, making it suitable for cruising, docking, and auxiliary sailboat operations. Its torque characteristics at low and mid-range RPM offer excellent maneuverability, especially for displacement hulls and traditional sailing vessels.

The engine is engineered for fuel efficiency, allowing extended cruising ranges with economical fuel consumption, and providing reliable performance for both recreational and commercial marine use.

Marine Integration

The 44B Four is compatible with marine gearboxes and conventional shaft-drive systems, offering flexible installation options for a variety of hull types. Its balanced four-cylinder design minimizes vibration and noise, enhancing onboard comfort during extended operations.

Ease of Maintenance & Reliability

One of the key strengths of the Westerbeke 44B Four is its service-friendly design. Routine maintenance such as oil changes, filter replacement, and belt inspections is straightforward, reducing downtime and service costs. Westerbeke global reputation ensures strong parts availability and technical support, guaranteeing long-term reliability.

Ideal Applications

The Westerbeke 44B Four Diesel Engine is ideal for:

• Sailboats and auxiliary propulsion systems

• Small to medium cruising yachts

• Coastal and inland waterway vessels

• Owners seeking a reliable, fuel-efficient, and durable marine diesel engine

Key Advantages

• Proven Westerbeke marine diesel reliability

• Compact and durable design for tight engine compartments

• Fuel-efficient 4-cylinder direct injection engine

• Freshwater cooling with heat exchanger

• Smooth operation with low vibration and noise

• Easy maintenance and strong parts availability

Technical Specifications

General

• Model: Westerbeke 44B Four

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

• Fuel System: Direct fuel injection

• Aspiration: Naturally aspirated

• Number of Cylinders: 4 inline

Displacement & Combustion

• Displacement: Approx. 2.7 liters

• Bore × Stroke: 88.9 mm × 88.9 mm (3.5″ × 3.5″)

• Combustion Chamber: Direct injection diesel

Performance

• Rated Power: 44 HP (32.8 kW) @ 3,000 RPM

• Rated Speed: 3,000 RPM

• Maximum Torque: Approx. 125–130 Nm @ 2,000–2,500 RPM

• Fuel Consumption: Low, depends 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. 7 liters

• Recommended Oil Type: Marine-grade diesel engine oil

Electrical System

• Starting System: 12 V electric start

• Starter Motor Output: Approx. 1.5 kW

• Alternator: 12 V marine alternator for onboard electrical systems

Dimensions & Weight

• Overall Dimensions (L × W × H): Approx. 900 × 550 × 650 mm

• Dry Weight: Approx. 280–300 kg (engine only, excluding gearbox)

Drive & Installation

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

• Drive Type: Inboard shaft drive

• Compatible Gearbox: Standard marine transmission for small to medium vessels

• Mounting: Flexible engine mounts for vibration reduction

Service & Adjustment

• Valve Clearance (Cold): Intake: 0.25 mm / Exhaust: 0.25 mm

• Firing Order: 1 – 3 – 4 – 2

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