4.2 MCGB-514 Westerbeke 4.2 kW Multiport EFI – 50 Hz – 1500 RPM

Description

New Westerbeke 4.2 MCGB-514 4.2 kW 50 Hz Multiport EFI Marine Gasoline Generator For Sale

Compact Low-Speed Marine Power for Yachts and Recreational Vessels

The New Westerbeke 4.2 MCGB-514 4.2 kW 50 Hz Multiport EFI Marine Gasoline Generator is a compact, low-profile marine gasoline generator set engineered to provide dependable onboard electricity for motor yachts, express cruisers, sport-fishing boats, cabin cruisers, sailing yachts, and other gasoline-powered recreational vessels.

Designed for compatible 230V, 50 Hz marine electrical systems, the Westerbeke 4.2 MCGB-514 4.2 delivers 4.2 kW of single-phase electrical power while operating at a low 1500 RPM. Its three-cylinder industrial gasoline engine, sequential multiport electronic fuel injection, electronic governing, water-cooled returnless fuel system, brushless four-pole alternator, freshwater cooling, one-touch controls, and automatic safety shutdowns support smooth and reliable onboard operation.

The standard configuration supplies 230V AC power at approximately 18.2 amps, using a single-phase, four-wire arrangement with a power factor of 1.0. Its 4.2 kW capacity may support compatible marine air-conditioning systems, refrigeration, battery chargers, freshwater pumps, lighting, entertainment equipment, water heaters, electrical outlets, and selected galley appliances, subject to a proper vessel load assessment.

The generator measures approximately 26.4 inches long, 18.4 inches wide, and 17.9 inches high. Published weight is approximately 343–344 lb., or about 156 kg, depending on the manufacturer document referenced. These relatively compact dimensions allow the generator to deliver low-speed power without requiring the installation envelope normally associated with larger traditional generator sets. 4.2 MCGB-514 4.2

Customers looking for the Westerbeke 4.2 MCGB-514 4.2 for sale should confirm the vessel’s voltage, frequency, continuous electrical demand, motor-starting loads, machinery-space dimensions, raw-water supply, exhaust arrangement, fuel-system compatibility, optional enclosure, and installation accessories before ordering.

Purpose-Built Westerbeke Marine Generator Engineering

The Westerbeke 4.2 MCGB-514 4.2 generator is designed specifically for onboard marine electricity generation. Unlike portable household generators or general-purpose industrial units adapted for vessel use, it integrates marine cooling, a water-injected exhaust arrangement, electronic fuel management, gasoline ignition protection, vibration isolation, automatic safety monitoring, and vessel-compatible remote controls.

The generator is engineered for operating conditions that may include:

• Continuous vessel movement and vibration
• Salt-laden marine air
• High machinery-space humidity
• Elevated compartment temperatures
• Restricted installation space
• Changing electrical demand
• Extended operation away from shore power
• Vessel movement and inclination

Westerbeke describes the 4.2 MCGB-514 4.2 as a compact, low-CO, low-profile and low-speed generator. Its marine design combines a heavy-duty industrial base engine with a relatively compact generator package comparable in size to many higher-speed alternatives.

The generator meets applicable United States Coast Guard requirements and is listed as meeting CARB and United States EPA regulations. Westerbeke also identifies the model as CE certified. Installation must still comply with the regulations and marine standards applicable to the vessel and country of operation.  4.2 MCGB-514 4.2

The 4.2 MCGB-514 4.2 is listed among Westerbeke’s current-production Multiport EFI gasoline generators and is backed by the manufacturer’s five-year limited warranty, subject to Westerbeke’s applicable warranty terms, registration requirements, installation standards, and service conditions.

Customers comparing the Westerbeke 4.2 MCGB-514 4.2 price should consider more than its 4.2 kW output. Low-speed operation, Multiport EFI, electronic governing, freshwater cooling, low-CO engineering, service accessibility, alternator construction, safety monitoring, warranty support, and worldwide parts availability all contribute to the generator’s overall value.

Smooth Three-Cylinder Gasoline Engine Performance

The Westerbeke 4.2 MCGB-514 4.2 uses a naturally aspirated, three-cylinder, four-cycle gasoline engine arranged vertically inline.

Its published engine characteristics include:

• Three-cylinder vertical inline configuration
• Four-cycle gasoline operation
• Naturally aspirated air intake
• Approximately 48.5 cubic inches or 0.795 litres of displacement
• 2.70-inch bore
• 2.83-inch stroke
• 9.0:1 compression ratio
• Semi-spherical combustion chamber
• Electronic governing
• 1500 RPM operation at 50 Hz
• Approximately 11 horsepower at 1500 RPM
• Aluminium cylinder head
• Cast-iron cylinder block
• Forged crankshaft supported by four main bearings
• Overhead rotating valves

These specifications are published in Westerbeke’s current advanced specification sheet for the 4.2/5.0 MCGB generator platform.

The three-cylinder industrial engine provides smoother power delivery than many compact single-cylinder and twin-cylinder generator platforms. Its electronically controlled 1500 RPM operating speed also produces a lower mechanical frequency than the 3000 RPM speed commonly used by smaller 50 Hz gasoline generators.

Lower-speed three-cylinder operation may contribute to:

• Reduced mechanical vibration
• Smoother power delivery
• Lower operating noise
• Improved onboard comfort
• Reduced engine-speed variation
• Better suitability for extended operation
• Longer service life when properly maintained

Westerbeke rates the platform for a maximum operating inclination of up to 25 degrees in all directions in its advanced specification sheet. A newer shared operator manual lists a 20-degree maximum for the covered gasoline-generator family, so installers should follow the limit stated on the specific generator identification plate and serial-number-specific documentation.

A properly sized marine gasoline generator allows vessel owners to operate essential AC systems while cruising or remaining at anchor without relying continuously on marina shore power.

4.2 kW Single-Phase Electrical Output

The standard Westerbeke 4.2 MCGB-514 configuration provides the following electrical ratings:

Electrical Specification	Rating
Rated Electrical Output	4.2 kW
Voltage	230V
Frequency	50 Hz
Electrical Configuration	Single Phase
Number of Wires	Four
Power Factor	1.0
Rated Current	18.2 Amps
Engine Operating Speed	1500 RPM
Starting Method	Remote Electric Start
Alternator Type	Brushless, Four Pole

These electrical ratings are specified by Westerbeke for the 4.2 MCGB-514 4.2 configuration.

The same engine-and-alternator platform is used for the 5.0 MCGB-614, which produces 5.0 kW at 120V and 60 Hz while operating at 1800 RPM. Westerbeke lists the platform as field-convertible between 50 Hz and 60 Hz; however, changing the frequency also changes the rated speed, voltage arrangement and output designation. Conversion should therefore be performed only in accordance with Westerbeke technical instructions by a qualified marine generator technician.

The vessel’s continuous electrical demand should remain within the generator’s rated output while preserving sufficient reserve for temporary startup loads.

Electrical systems that may require substantially more current during startup include:

• Marine air-conditioning compressors
• Refrigerators and freezers
• Freshwater pumps
• Seawater pumps
• Battery chargers
• Water makers
• Ventilation motors
• Galley appliances
• Electric water heaters

Electric motors may require several times their normal running current during startup. The exact startup requirement depends on the motor design, connected mechanical load, wiring, voltage drop and control arrangement.

An undersized generator may experience:

• Voltage reduction
• Frequency instability
• Difficulty starting compressors
• Circuit-breaker operation
• Excessive engine loading
• Protective shutdown
• Increased operating temperature
• Reduced generator service life

A professional marine electrical load assessment should consider continuous demand, compressor and motor startup current, simultaneous appliance operation, battery-charger consumption, voltage drop, and a practical operating reserve.

A 4.2 kW generator should not automatically be expected to operate every onboard appliance simultaneously. Sensible load management may be required when starting air-conditioning compressors, water heaters, chargers, pumps, or other high-demand systems.

Multiport Electronic Fuel Injection

One of the principal features of the Westerbeke 4.2 MCGB-514 4.2 is its sequential multiport electronic fuel-injection system.

Multiport EFI supplies gasoline through electronically controlled fuel injectors rather than a traditional marine carburettor. Westerbeke states that this system supports fuel efficiency, easier starting, improved reliability, reduced emissions, and advanced diagnostic capability.

The EFI system works with the generator’s electronic control unit, ignition components, engine sensors, high- and low-pressure fuel supply, and electronic governor.

Potential benefits include:

• Easier cold and warm starting
• Precise fuel delivery
• Improved response to changing electrical loads
• Reduced carburettor-related maintenance
• Electronic fault monitoring
• Improved performance at varying temperatures
• More consistent engine operation
• Reduced exhaust emissions

The current shared operator manual specifies fresh unleaded gasoline with an octane rating of 89 or higher. It also warns that gasoline containing more than 10% ethanol is not approved and may affect warranty coverage.

Fuel quality remains essential. Water contamination, deteriorated gasoline, blocked filters, deposits, damaged fuel hoses, or prolonged storage of unstable fuel may cause difficult starting, poor running, injector problems, or fuel-system damage.

A suitable marine gasoline water-separating filter should be installed between the vessel’s fuel tank and generator. Fuel hoses, shutoff valves, filters, electrical components, ventilation, and installation practices must comply with the applicable marine gasoline-fuel standards. 4.2 MCGB-514 4.2

Water-Cooled Returnless Fuel System

The Westerbeke 4.2 MCGB-514 4.2 uses a water-cooled returnless gasoline fuel system designed to improve operation in elevated machinery-space temperatures.

The system helps reduce the risk of vapour lock by controlling fuel temperature before gasoline reaches the electronic injectors. Vapour lock can occur when heated gasoline forms vapour inside the fuel-delivery system, interrupting normal fuel flow and causing difficult starting, power loss, or engine shutdown.

Westerbeke specifically identifies vapour-lock prevention and improved performance in high ambient temperatures as advantages of the water-cooled returnless system.

Published fuel-system characteristics include:

• Sequential Multiport EFI
• Electric fuel-transfer pump
• Water-cooled returnless fuel arrangement
• Electronic fuel and ignition control
• Replaceable engine-mounted fuel-filter element
• Minimum 1/4-inch fuel-hose inside diameter
• Maximum 3/8-inch fuel-hose inside diameter
• Advanced electronic diagnostic capability

The fuel-hose range and high-/low-pressure electric fuel-pump arrangement are specified in Westerbeke’s shared operator manual for the 4.2/5.0 and 6.2/7.5 MCGA/B families.

Low-CO Marine Generator Technology

The Westerbeke 4.2 MCGB-514 4.2 belongs to the company’s low-carbon-monoxide Multiport EFI gasoline-generator range.

Westerbeke explains that its Multiport EFI generators reduce normal carbon-monoxide output through precise control of the engine’s air-to-fuel ratio combined with exhaust after-treatment using a specialised catalyst.

Low-CO does not mean CO-free.

Carbon monoxide is colourless, odourless and potentially fatal. Even a generator designed to produce reduced CO levels can create a dangerous situation if exhaust enters an engine compartment, cabin, cockpit, enclosed canvas area, swim-platform space, or another occupied part of the vessel. 4.2 MCGB-514 4.2

A correctly installed gasoline-generator system should include:

• Functioning marine carbon-monoxide detectors
• Properly designed wet-exhaust routing
• Adequate machinery-space ventilation
• Secure exhaust hoses and clamps
• A correctly sized waterlift muffler
• Suitable exhaust-outlet placement
• Regular catalyst inspection
• Periodic exhaust-system checks
• Immediate investigation of every CO alarm

Westerbeke’s operator manual states that the generator should not be operated unless the vessel has an appropriate functioning marine carbon-monoxide detector. It also advises operating compartment blowers and checking the exhaust system regularly for leakage. 4.2 MCGB-514 4.2

The catalyst should be inspected and replaced when necessary every 500 operating hours. Westerbeke also calls for verification of satisfactory CO levels seasonally or every 250 operating hours, whichever occurs first, using an appropriate analyser.

Water intrusion into the exhaust can damage the catalyst and reduce the effectiveness of the low-CO system. Proper exhaust design, correct siphon-break installation where required, and compliance with Westerbeke’s installation instructions are therefore essential.

Electronic Governing for Stable Frequency

The Westerbeke 4.2 MCGB-514 4.2 uses an electronic engine governor to maintain consistent engine speed as the connected electrical demand changes.

When an air-conditioning compressor, pump, refrigerator, battery charger, or other electrical load starts, the engine experiences an immediate increase in mechanical demand. The electronic governor responds by adjusting throttle and fuel delivery to help maintain the rated 1500 RPM operating speed.

Westerbeke states that electronic speed control maintains constant engine speed, supports precise frequency regulation, and virtually eliminates the “bogging down” that can occur when load is applied.

The published frequency regulation is approximately 0.5 Hz, or 1%, from no load to full load.

Stable frequency can improve the operation of:

• Marine air-conditioning systems
• Refrigeration equipment
• Battery chargers
• Freshwater pumps
• Electric motors
• Lighting circuits
• Entertainment equipment
• Sensitive onboard electronics

Generator stability still depends on correct wiring, proper grounding, suitable cable sizing, effective ventilation, circuit protection, and sensible load management.

Brushless Four-Pole Marine Alternator

The Westerbeke 4.2 MCGB-514 4.2 uses a brushless four-pole revolving-field alternator designed for dependable onboard electricity generation.

Its published alternator features include:

• Brushless construction
• Four-pole design
• Revolving electrical field
• Capacitor voltage regulation
• Class H insulation
• Approximately ±5% voltage regulation
• Approximately 0.5 Hz frequency regulation
• Direct-connected cast centrifugal cooling blower
• Marine electromagnetic-interference control

These alternator characteristics are published in Westerbeke’s current advanced specification sheet and operator manual.

The four-pole design enables the generator to produce 50 Hz electricity at 1500 RPM. By comparison, a two-pole 50 Hz generator normally operates at approximately 3000 RPM.

Potential benefits of the four-pole, low-speed arrangement include:

• Lower operating speed
• Reduced mechanical frequency
• Reduced brush-related maintenance
• Stable onboard electrical output
• Improved winding protection
• Better suitability for extended operation
• Lower operating noise than many high-speed alternatives

Westerbeke states that the alternator’s electromagnetic-interference performance exceeds the requirements of most marine radio telephones and standard television equipment.

Electrical performance depends on the complete vessel installation, including output-cable sizing, circuit breakers, neutral and grounding arrangements, transfer switching, ventilation, and load distribution.

Freshwater Cooling with Marine Heat Exchanger

The Westerbeke 4.2 MCGB-514 uses a freshwater cooling system with a marine heat exchanger.

Internal coolant circulates through the engine and freshwater-cooled exhaust manifold. Raw water removes heat through the heat exchanger before being discharged through the generator’s water-injected marine exhaust arrangement. 4.2 MCGB-514 4.2

The cooling arrangement includes:

• Closed freshwater coolant circuit
• Marine heat exchanger
• Belt-driven freshwater circulation pump
• Belt-driven raw-water pump
• Coolant-recovery tank
• Freshwater-cooled cast-aluminium exhaust manifold
• Water-injected exhaust elbow
• Thermostatic temperature control

The published cooling-system capacity is approximately 3.5 US quarts or 3.31 litres. The generator uses a 0.75-inch outside-diameter raw-water connection and a 2-inch outside-diameter exhaust-elbow connection.

Cooling and Exhaust Specification	Rating
Cooling-System Capacity	3.5 qt. / 3.31 L
Raw-Water Connection	0.75 in. OD / 19.1 mm
Exhaust Connection	2.0 in. OD / 50.8 mm
Normal Operating Temperature	Approximately 170–190°F / 77–88°C
Freshwater Pump	Belt-Driven Centrifugal Type
Raw-Water Pump	Belt-Driven Rubber-Impeller Type

The operating-temperature range and pump arrangements are identified in the current operator manual covering the MCGA/B generator family.

Routine cooling-system maintenance should include inspection of:

• Coolant level and condition
• Raw-water seacock
• Seawater strainer
• Raw-water pump impeller
• Freshwater pump
• Drive belts
• Heat exchanger
• Cooling hoses and clamps
• Exhaust mixing elbow
• Waterlift muffler
• Wet-exhaust hose
• Siphon-break arrangement

Restricted raw-water flow, a blocked strainer, worn impeller, loose belt, fouled heat exchanger, restricted exhaust elbow, or inadequate machinery-space ventilation may cause overheating.

Fuel Consumption

Westerbeke publishes the following approximate fuel-consumption figures for the 4.2 MCGB-514 4.2 operating at 1500 RPM:

Generator Load	Approximate Fuel Consumption
100% Load	0.67 US gal/hr / 2.55 L/hr
75% Load	0.55 US gal/hr / 2.10 L/hr
50% Load	0.45 US gal/hr / 1.70 L/hr
25% Load	0.35 US gal/hr / 1.32 L/hr

These are manufacturer-published approximate figures. Actual fuel consumption may vary according to electrical demand, fuel quality, engine condition, maintenance, installation, machinery-space temperature, and operating environment. 4.2 MCGB-514 4.2

One-Touch Starting and Automatic Safety Shutdowns

The Westerbeke 4.2 MCGB-514 4.2 includes a simple one-touch start-and-stop control panel.

The standard control panel incorporates:

• One-touch start-and-stop operation
• Running-hour meter
• Warning-annunciation light strip
• AC circuit breaker
• DC control protection
• Connection provision for optional remote controls

Westerbeke lists the one-touch panel, running-hour meter, warning lights and AC circuit breaker among the generator’s standard equipment.

Automatic safety systems are designed to warn the operator or stop the generator when potentially damaging conditions are detected.

Published warning and shutdown functions include:

• Engine overspeed
• Engine underspeed
• Low engine-oil pressure
• High exhaust temperature
• High engine-coolant temperature
• Additional electronic-control faults

These protection functions are listed on Westerbeke’s product page and advanced specification sheet.

Other standard electrical and control features include:

• 12V electric starting motor
• 1.4 kW starter
• 12-amp battery-charging system
• 12V negative-ground electrical system
• Approximately 120 amps cranking draw at 70°F
• Electronic ignition and fuel control
• Remote-start capability

Westerbeke’s current operator manual recommends a dedicated generator starting battery rated at approximately 800–1,000 cold-cranking amps. Final battery and cable selection should consider cable length, voltage drop, temperature and applicable marine electrical standards.

Automatic shutdown protection reduces the risk of serious generator damage but does not replace routine inspection. Engine oil, coolant, raw-water flow, fuel supply, exhaust components, belts, electrical connections and compartment ventilation should be checked regularly.

Quiet 1500 RPM Operation

Noise and vibration are important considerations aboard vessels where the generator may be installed close to cabins, seating areas or overnight accommodation.

The Westerbeke 4.2 MCGB combines:

• Smooth three-cylinder operation
• Electronically controlled 1500 RPM engine speed
• Precise electronic governing
• Heavy-duty industrial base engine
• Flexible vibration isolators
• Freshwater-cooled exhaust manifold
• Water-injected marine exhaust
• Low-profile installation design

Westerbeke describes the 4.2 MCGB-514 4.2 as extremely smooth and quiet, noting that 3000 RPM engines are generally noisier than comparable 1500 RPM generator platforms and may require additional sound shielding to achieve similar onboard sound levels.

A properly installed quiet marine gasoline generator should also include:

• Correctly sized waterlift muffler
• Proper wet-exhaust routing
• Suitable machinery-space insulation
• Flexible fuel and cooling connections
• Correct vibration-isolator positioning
• Properly supported hoses and cables
• Adequate compartment ventilation
• Sufficient maintenance clearance

Final onboard sound levels depend on the complete installation rather than the generator alone. Hull construction, mounting strength, insulation, exhaust routing, ventilation openings and structural vibration transfer all influence the result.

Optional Westerbeke Ventilated Enclosure

For installations requiring additional machinery protection and controlled ventilation, the Westerbeke 4.2 MCGB may be supplied with an optional factory ventilated enclosure.

Westerbeke states that the enclosure is not sold separately. It should therefore be specified with the generator package when required.

Approximate enclosure specifications are:

Enclosure Measurement	Specification
Length	30.3 in. / 768 mm
Width	21.6 in. / 550 mm
Height	18.8 in. / 477 mm
Enclosure Weight	Approximately 20 lb. / 9 kg

The enclosure dimensions and weight are published in Westerbeke’s official advanced specification sheet.

The installation drawing shows separate arrangements for rear-exhaust and optional side-exhaust configurations, together with pass-through locations for the remote panel cable, battery cables, fuel line, wet exhaust, raw-water connections and AC output conductors.

The ventilated enclosure should not be treated as a substitute for proper machinery-space airflow. Westerbeke’s operator manual states that forced ventilation should maintain generator-compartment temperature below approximately 122°F or 50°C.

Installation Dimensions and Weight

The approximate base-generator dimensions are:

Measurement	Specification
Length	26.4 in. / 671 mm
Width	18.4 in. / 467 mm
Height	17.9 in. / 455 mm
Dry Weight	Approximately 344 lb. / 156 kg
Maximum Operating Inclination	Follow Model-Specific 20–25° Limit

The dimensions are published on Westerbeke’s current product page and advanced specification drawing.

Before installation, the vessel owner, boat builder or marine engineer should confirm:

• Machinery-space dimensions
• Mounting-point positions
• Generator lifting and removal route
• Dry and operating weight
• Service clearances
• Machinery-space ventilation
• Ignition-protected electrical installation
• Raw-water inlet position
• Wet-exhaust routing
• Siphon-break requirements
• Fuel-supply connection
• AC output cable route
• Starting-battery cable route
• Remote-control harness route
• Carbon-monoxide detector placement
• Optional enclosure clearance
• Rear- or side-exhaust configuration

When replacing an existing marine gasoline generator, matching only its kilowatt output is insufficient. Voltage, frequency, phase, dimensions, weight, mounting centres, cooling, exhaust, fuel supply, ventilation, ignition protection and control compatibility must also be evaluated.

Applications of the Westerbeke 4.2 MCGB-514 4.2

Motor Yachts

The generator may support compatible marine air conditioning, refrigeration, battery charging, water heating, lighting, freshwater pumps, entertainment equipment and electrical outlets.

Express Cruisers

Its low-profile design and gasoline fuel system make it suitable for compatible gasoline-powered express cruisers requiring independent 230V electricity away from shore power.

Sport-Fishing Boats

The 4.2 MCGB-514 may provide electricity for refrigeration, bait-well pumps, battery chargers, lighting, marine electronics and selected onboard appliances.

Cabin Cruisers

The generator may support overnight-comfort systems such as air conditioning, refrigeration, lighting, battery charging, water heating and electrical outlets.

Sailing Yachts

Where gasoline fuel, installation requirements and electrical configuration are suitable, the generator may provide auxiliary power for refrigeration, chargers, water systems, air conditioning and domestic loads.

Marine Refit Projects

The generator may be considered when replacing an ageing, unreliable, high-speed or undersized gasoline generator, provided its mechanical, electrical, cooling, exhaust, fuel and safety requirements are compatible with the vessel.

Technical Specifications of the Westerbeke 4.2 MCGB-514 4.2

Specification	Details
Brand	Westerbeke
Model	4.2 MCGB-514
Generator Category	Multiport EFI Marine Gasoline Generator
Rated Electrical Output	4.2 kW
Voltage	230V
Frequency	50 Hz
Electrical Configuration	Single Phase
Number of Wires	Four
Rated Current	18.2 Amps
Power Factor	1.0
Engine Operating Speed	1500 RPM
Starting Method	Remote Electric Start
Engine Configuration	Three Cylinders, Vertical Inline
Engine Cycle	Four-Cycle Gasoline
Aspiration	Naturally Aspirated
Displacement	48.5 cu. in. / 0.795 L
Bore × Stroke	2.70 × 2.83 in.
Compression Ratio	9.0:1
Combustion Chamber	Semi-Spherical
Engine Output	Approximately 11 HP at 1500 RPM
Governor	Electronic
Fuel System	Sequential Multiport EFI
Fuel Type	Unleaded Gasoline, 89 Octane or Higher
Maximum Ethanol Content	E10 / 10%
Fuel Arrangement	Water-Cooled Returnless System
Fuel-Transfer Pump	Electric
Full-Load Fuel Consumption	0.67 GPH / 2.55 LPH
Alternator Type	Brushless, Four Pole
Voltage Regulation	Approximately ±5%
Frequency Regulation	Approximately 0.5 Hz / 1%
Alternator Insulation	NEMA Class H
Cooling System	Freshwater with Heat Exchanger
Cooling-System Capacity	3.5 qt. / 3.31 L
Raw-Water Connection	0.75 in. OD
Exhaust Connection	2.0 in. OD
Exhaust System	Water-Injected Marine Exhaust
Lubricating-Oil Capacity	3.0 qt. / 2.8 L
Oil Filter	Full-Flow Spin-On Element
Starting System	12V DC, Negative Ground
Starting Motor	1.4 kW
Battery Charger	12 Amps
Cranking Draw	Approximately 120 Amps at 70°F
Starting Battery	Dedicated 800–1,000 CCA Recommended
Remote Start Connection	Standard
Optional Enclosure	Ventilated Enclosure
Approximate Dimensions	26.4 × 18.4 × 17.9 in.
Approximate Dry Weight	344 lb. / 156 kg
Production Status	Current Production
Warranty	Five-Year Limited Warranty

The specifications above are based on Westerbeke’s current product page, February 2026 advanced specification sheet and January 2026 operator manual. Individual configurations may vary according to serial number, installation, optional exhaust arrangement and later manufacturer revisions. 4.2 MCGB-514 4.2

Standard Equipment and Available Options

Typical standard equipment includes:

• Three-cylinder Westerbeke gasoline engine
• Sequential Multiport EFI
• Water-cooled returnless fuel system
• Electronic engine governor
• Brushless four-pole alternator
• One-touch start-and-stop control panel
• Running-hour meter
• Warning-annunciation light strip
• Automatic safety warnings and shutdowns
• Freshwater cooling system
• Marine heat exchanger
• Coolant-recovery tank
• Remote lubricating-oil filter
• AC output circuit breaker
• 12-amp battery charger
• Water-injected exhaust elbow
• Belt-driven raw-water pump
• Flexible vibration isolators
• Lubricating-oil drain hose
• Belt guard
• Operator’s manual
• Parts documentation

These standard features are listed by Westerbeke for the current 4.2 MCGB-514 4.2 generator.

Available options may include:

• Remote start-and-stop panel
• Remote extension harness
• Onboard spare-parts Kit A
• Extended-cruising spare-parts Kit B
• Hydro-Hush muffler and fittings
• Anti-siphon valve with 3/4-inch stainless-steel loop
• Ship-to-shore transfer switch
• Auxiliary DC power adapter
• SIDEX water-injected exhaust elbow
• Factory ventilated enclosure

The ventilated enclosure is identified as an option that is not sold separately. The final package should therefore be confirmed during quotation.

Frequently Asked Questions

What is the Westerbeke 4.2 MCGB-514 price?

The 4.2 MCGB-514 4.2 price depends on current availability, included controls, optional ventilated enclosure, exhaust configuration, installation accessories, packing requirements, shipping destination and export documentation.

How much power does the Westerbeke 4.2 MCGB-514 provide?

It delivers 4.2 kW at 230V and 50 Hz, with rated single-phase output of approximately 18.2 amps.

Is the Westerbeke 4.2 MCGB-514 a diesel generator?

No. It is a marine gasoline generator powered by a naturally aspirated three-cylinder engine with sequential Multiport EFI.

What does Multiport EFI mean?

Multiport EFI uses electronically controlled fuel injectors to supply gasoline precisely to the engine. Westerbeke identifies easier starting, improved fuel efficiency, increased reliability, reduced emissions and advanced diagnostics among its benefits.

What does low-CO mean?

Low-CO means the generator is engineered to reduce normal carbon-monoxide output through precise air-to-fuel control and catalyst-based exhaust after-treatment. It does not mean that the exhaust is carbon-monoxide-free. Proper ventilation, exhaust installation, catalyst maintenance and functioning CO detectors remain essential.

How many cylinders does the engine have?

The generator uses a three-cylinder vertical inline gasoline engine with approximately 0.795 litres of displacement.

What speed does the engine operate at?

The 4.2 MCGB-514 4.2 operates at an electronically controlled 1500 RPM when producing 50 Hz electricity.

What fuel does it use?

The engine uses unleaded gasoline with an octane rating of 89 or higher. Westerbeke does not approve gasoline containing more than 10% ethanol.

How much fuel does it consume?

Published full-load fuel consumption at 1500 RPM is approximately 0.67 US gallons per hour or 2.55 litres per hour.

Does it include remote starting?

Yes. The generator is configured for remote electric starting, and optional remote start-and-stop panels and extension harnesses are available.

Is the 4.2 MCGB-514 4.2 field-convertible to 60 Hz?

Westerbeke lists the platform as field-convertible between 50 Hz and 60 Hz. However, conversion changes engine speed and the applicable electrical rating. It should be completed only by a qualified technician following Westerbeke’s approved procedures.

Is an enclosure available?

Yes. Westerbeke lists an optional ventilated enclosure measuring approximately 30.3 × 21.6 × 18.8 inches and weighing approximately 20 lb. The enclosure is not sold separately. 4.2 MCGB-514 4.2

Can it operate a marine air conditioner?

It may operate a compatible marine air-conditioning system, depending on the unit’s continuous demand, compressor-starting current, vessel wiring and other simultaneous loads. A professional electrical-load assessment should be completed before purchase.

Can it replace another 4.2 kW marine generator?

Potentially. The installer must verify voltage, frequency, phase, dimensions, weight, mounting, fuel supply, ventilation, ignition protection, raw-water cooling, exhaust routing, electrical connections and service access.

Request a Quote for the Westerbeke 4.2 MCGB-514

The New 4.2 MCGB-514 4.2 kW 50 Hz Multiport EFI Marine Gasoline Generator is a dependable choice for owners of gasoline-powered vessels requiring compact, low-speed and reliable marine auxiliary power.

Its 4.2 kW output, 230V single-phase configuration, smooth three-cylinder industrial engine, electronically controlled 1500 RPM operation, sequential Multiport EFI, water-cooled returnless fuel system, low-CO technology, brushless four-pole alternator, freshwater cooling, automatic safety protection and optional ventilated enclosure make it suitable for a broad range of recreational marine applications.

Contact our marine generator specialists to confirm:

• Current stock availability
• Generator serial number and manufacturing date
• Warranty eligibility
• 230V, 50 Hz electrical configuration
• Included control panel and remote harness
• Rear- or side-exhaust arrangement
• Optional ventilated-enclosure availability
• Included installation accessories
• Packing dimensions and shipment weight
• Domestic or international shipping options