7.5 MCGB-614 Westerbeke 7.5 kW Multiport EFI – 60 Hz – 1800 RPM

Description

New Westerbeke 7.5 MCGB-614 7.5 kW Multiport EFI Marine Generator For Sale

Low-Speed Gasoline Power for Yachts and Marine Vessels

The Westerbeke 7.5 MCGB 7.5-614  kW Multiport EFI Marine Generator is a compact, low-profile gasoline generator designed to provide dependable onboard electricity for motor yachts, sport cruisers, houseboats, passenger craft, and other compatible marine vessels.

Delivering 7.5 kW at 120V, 60 Hz and 1800 RPM, the 7.5 MCGB 7.5-614 combines a smooth three-cylinder industrial engine with sequential multiport electronic fuel injection, electronic governing, a water-cooled returnless fuel system, freshwater cooling, a brushless four-pole alternator, remote starting, and automatic safety protection. The model is listed by Westerbeke among its current-production Multiport EFI marine gasoline generators.  7.5 MCGB 7.5

The 7.5 MCGB may provide power for compatible onboard systems such as:

• Battery chargers and inverter-chargers
• Refrigerators and freezers
• Freshwater and seawater pumps
• Navigation and communication electronics
• Cabin and deck lighting
• Electrical outlets
• Entertainment systems
• Selected galley appliances
• Appropriately sized marine air-conditioning systems

Actual compatibility depends on the vessel’s continuous electrical demand, motor-starting current, simultaneous appliance use, and required generator reserve.

A Gasoline Marine Generator, Not a Diesel Generator

The Westerbeke 7.5 MCGB 7.5 is a gasoline or petrol marine generator. It is not designed to operate on diesel fuel.

Its sequential Multiport EFI system electronically controls gasoline delivery to the engine, while the water-cooled returnless fuel system helps prevent vapor lock in high machinery-space temperatures. The generator should only be installed on a vessel with an approved marine gasoline fuel system, ignition-protected components, suitable ventilation, and a properly engineered wet-exhaust arrangement.

Correct fuel identification is essential when planning:

• Fuel-tank compatibility
• Fuel-hose specifications
• Fuel filtration
• Ventilation and blower capacity
• Ignition-protected electrical components
• Fire and explosion protection
• Carbon-monoxide detection
• Exhaust-system routing
• Installation-code compliance

Installation and servicing should be carried out by a qualified marine technician familiar with gasoline-generator safety requirements.

Compact, Low-Profile and Low-Speed Design

The Westerbeke 7.5 MCGB 7.5 is designed to provide 7.5 kW of marine electricity without relying on the high operating speed used by many compact generator sets.

Its electronically controlled 1800 RPM operating speed is half the speed of a typical two-pole 3600 RPM generator. Westerbeke states that the lower operating speed, three-cylinder industrial engine, and marine-specific construction contribute to smoother, quieter, and more reliable performance.

Important design features include:

• Three-cylinder industrial gasoline engine
• Sequential Multiport EFI
• Water-cooled returnless fuel system
• Electronic engine governing
• Freshwater cooling with heat exchanger
• Water-injected marine exhaust
• Brushless four-pole alternator
• One-touch start-and-stop controls
• Remote-start capability
• Automatic warnings and shutdowns
• Flexible vibration isolators
• AC output circuit breaker
• Remote lubricating-oil filter
• Optional ventilated enclosure

These features make the 7.5 MCGB 7.5 suitable for compatible new installations and marine generator replacement projects.

Three-Cylinder Industrial Gasoline Engine

The Westerbeke 7.5 MCGB 7.5 uses a naturally aspirated, three-cylinder, four-stroke gasoline engine with a displacement of 48.5 cubic inches or approximately 0.795 litres.

The engine produces approximately 13.2 hp at 1800 RPM. It incorporates an aluminium cylinder head, cast-iron cylinder block, forged crankshaft supported by four main bearings, and overhead rotating valves.

Engine specification	Published value
Number of cylinders	3
Cylinder arrangement	Vertical inline
Engine cycle	Four stroke
Fuel type	Gasoline/petrol
Aspiration	Naturally aspirated
Displacement	48.5 cu. in. / 0.795 L
Bore × stroke	2.70 × 2.83 in.
Compression ratio	9.0:1
Engine output at 1800 RPM	Approximately 13.2 hp
Fuel system	Sequential Multiport EFI
Governor	Electronic
Electrical system	12V DC, negative ground

The three-cylinder configuration helps deliver smoother power than many small single-cylinder or twin-cylinder generators. Combined with 1800 RPM operation and electronic speed control, it reduces noticeable vibration and engine-speed fluctuation as electrical loads change.

7.5 kW Electrical Output at 60 Hz

The Westerbeke 7.5 MCGB 7.5-614 is rated to produce 7.5 kW of single-phase electrical power.

Electrical specification	Rating
Generator model	7.5 MCGB-614
Rated output	7.5 kW
Voltage	120V
Rated current	62.5 amps
Frequency	60 Hz
Phase	Single phase
Number of wires	Four
Power factor	1.0
Operating speed	1800 RPM
Starting arrangement	Remote

These ratings are taken from Westerbeke’s February 2026 advanced specification sheet.

A professional marine electrical load assessment should consider:

• Total continuous electrical demand
• Air-conditioning compressor startup
• Refrigeration compressor startup
• Pump and motor starting current
• Battery-charger consumption
• Simultaneous appliance operation
• Generator reserve capacity
• Planned future additions

Electric motors may draw several times their normal operating current during startup. Westerbeke’s current operator manual advises operators to account for motor-starting loads and keep the current within the generator’s published rating.

Multiport Electronic Fuel Injection

The 7.5 MCGB 7.5 uses sequential multiport electronic fuel injection, commonly referred to as Multiport EFI or MPI.

Unlike a traditional carburettor, the EFI system electronically controls fuel delivery to the engine’s intake ports. Westerbeke identifies the system’s benefits as easier starting, improved fuel efficiency, reduced emissions, dependable operation, and advanced diagnostic capability.

Potential advantages include:

• Easier cold and warm starting
• Precise fuel delivery
• Consistent engine response
• Improved operation as electrical demand changes
• Reduced fuel-related hesitation
• Better high-temperature performance
• Electronic fault diagnosis
• Reduced normal exhaust emissions

The EFI system operates together with the electronic governor to help prevent the engine from bogging down when a substantial electrical load is connected.

Water-Cooled Returnless Fuel System

High machinery-space temperatures may cause gasoline to vaporise, potentially leading to vapor lock, difficult starting, or unstable operation.

The Westerbeke 7.5 MCGB 7.5 uses a water-cooled returnless fuel system designed to help control fuel temperature and maintain reliable fuel delivery in high ambient conditions.

The published fuel-supply connection is approximately ¼-inch internal diameter or 6.35 mm.

A correctly installed marine gasoline system should include:

• Approved gasoline-resistant marine fuel hose
• Correctly sized fuel-supply piping
• An accessible fuel shutoff valve
• Suitable fuel filtration
• Secure and leak-free connections
• Correct grounding and bonding
• Ignition-protected electrical components
• Adequate machinery-space ventilation
• Routine inspection for fuel leaks

The current operator manual specifies fresh unleaded gasoline with an octane rating of 89 or higher and no more than 10% ethanol.

Low-CO Marine Generator Technology

Westerbeke describes the 7.5 MCGB 7.5 as a Low-CO gasoline generator. Its electronically controlled fuel system and exhaust catalyst are designed to reduce normal carbon-monoxide emissions.

Low-CO does not mean zero carbon monoxide. Carbon monoxide remains a colourless, odourless, poisonous gas capable of causing serious injury or death.

Every installation should include:

• Approved marine carbon-monoxide detectors
• Correct detector placement in accommodation areas
• A properly installed and leak-free exhaust system
• Adequate machinery-space ventilation
• Correct exhaust-outlet positioning
• Regular fuel- and ignition-system maintenance
• Catalyst and exhaust-elbow inspection
• Periodic professional exhaust testing

Westerbeke’s current operator manual specifically instructs that carbon-monoxide detectors be mounted in all vessel living quarters.

Catalyst and Exhaust-System Maintenance

The catalyst is an important part of the generator’s Low-CO system. Water entering the exhaust can damage the catalyst and reduce its ability to control carbon-monoxide emissions.

Westerbeke instructs operators to inspect the catalyst for abnormalities and evidence of water intrusion. If the catalyst’s normal honeycomb surface is damaged or irregular, the cause must be corrected and the catalyst and sealing gasket replaced. The water-injected exhaust elbow should also be inspected for corrosion. 7.5 MCGB 7.5

A generator should not be operated with:

• A damaged catalyst
• A leaking exhaust connection
• A corroded injection elbow
• A faulty fuel-control component
• An inoperative carbon-monoxide detector
• Evidence of seawater entering the engine or catalyst

The installation should include the correct siphon protection whenever the exhaust-injection point is near or below the vessel’s loaded waterline.

Electronic Governing for Stable Frequency

The 7.5 MCGB 7.5 uses an electronic engine governor to maintain its rated 1800 RPM speed as connected electrical demand changes.

When a refrigerator compressor, pump, air-conditioning unit, or battery charger starts, the generator engine experiences an immediate increase in mechanical demand. The governor adjusts engine operation to reduce speed loss and maintain stable 60 Hz electrical frequency.

Westerbeke publishes frequency regulation of approximately 0.5 Hz, or 1%, from no load to full load.

Stable frequency supports reliable operation of compatible:

• Refrigeration compressors
• Air-conditioning systems
• Battery chargers
• Electric motors and pumps
• Navigation electronics
• Communication equipment
• Lighting circuits
• Entertainment systems

Electronic governing improves load response, but it cannot compensate for continuous overloading or incorrect generator sizing.

Brushless Four-Pole Alternator

The Westerbeke 7.5 MCGB 7.5 uses a brushless, four-pole revolving-field alternator.

Published alternator characteristics include:

• Brushless construction
• Four-pole design
• Revolving electrical field
• Class H winding insulation
• Direct-connected centrifugal cooling blower
• Approximately ±5% voltage regulation
• Approximately 0.5 Hz frequency regulation

The four-pole design enables the generator to produce 60 Hz electricity at 1800 RPM. Brushless construction also reduces routine maintenance associated with carbon brushes.

Westerbeke states that the generator’s electromagnetic-interference level exceeds the requirements of most marine radio telephones and standard televisions. Correct grounding, cable routing, circuit protection, and installation remain essential for reliable onboard performance.

Freshwater Cooling with Marine Heat Exchanger

The 7.5 MCGB 7.5 uses a freshwater cooling system with a marine heat exchanger.

Engine coolant circulates internally through the engine and freshwater-cooled aluminium exhaust manifold. Raw water drawn from outside the vessel removes heat through the exchanger before being discharged through the water-injected marine exhaust.

The cooling system includes:

• Closed freshwater coolant circuit
• Marine heat exchanger
• Coolant-recovery tank
• Freshwater-cooled exhaust manifold
• Belt-driven raw-water pump
• Water-injected exhaust elbow
• ¾-inch raw-water connection

The published coolant capacity is approximately 3.5 US quarts or 3.31 litres.

Routine cooling-system maintenance should include inspection of:

• Coolant level and condition
• Raw-water seacock
• Seawater strainer
• Raw-water pump and impeller
• Drive belt
• Heat-exchanger passages
• Cooling hoses and clamps
• Exhaust-injection elbow
• Siphon break
• Wet-exhaust hose and muffler

Restricted raw-water flow may cause high exhaust or coolant temperature and trigger an automatic shutdown.

Approximate Fuel Consumption

Westerbeke publishes the following approximate fuel-consumption figures for the 7.5 MCGB 7.5 operating at 1800 RPM:

Generator load	Approximate gasoline consumption
100% load	0.95 US gal/hr / 3.61 L/hr
75% load	0.76 US gal/hr / 2.86 L/hr
50% load	0.61 US gal/hr / 2.29 L/hr
25% load	0.44 US gal/hr / 1.66 L/hr

Actual fuel consumption may vary according to connected electrical demand, engine condition, fuel quality, ambient temperature, ventilation, installation, and maintenance.

One-Touch Starting and Remote Operation

The Westerbeke 7.5 MCGB 7.5 includes a straightforward one-touch start-and-stop control panel with a running-hour meter and warning-annunciation lights.

The generator also supports optional remote start-and-stop panels connected by an extension harness, allowing control from a helm, cabin, electrical panel, or another suitable location aboard the vessel.

The control arrangement includes:

• Start-and-stop rocker switch
• Running-hour meter
• Warning-annunciation display
• AC output circuit breaker
• Electronic engine control
• Automatic protective shutdowns
• Remote-panel compatibility

Automatic Safety Warnings and Shutdowns

The 7.5 MCGB 7.5 monitors potentially damaging operating conditions and can shut down automatically when a serious fault is detected.

Published protection includes:

• Engine overspeed
• Engine underspeed
• Low lubricating-oil pressure
• High exhaust temperature
• High engine-coolant temperature
• Additional monitored operating faults

These systems help protect the engine and generator, but they do not replace regular checks of oil, coolant, raw-water flow, fuel connections, exhaust components, ventilation, and electrical wiring.

Integral Starting-Battery Charger

The generator includes an integral charger for its dedicated 12V starting battery.

Westerbeke’s current product page lists a 10-amp battery charger, while its February 2026 advanced specification sheet lists a 12-amp integral electric charger. Because the published documents differ, the battery-charging specification should be confirmed for the exact unit and serial number before quotation or installation.

The starting battery should be:

• Correctly sized for the generator
• Properly secured
• Connected with marine-grade cables
• Protected by suitable switches and circuit protection
• Maintained according to the battery manufacturer’s instructions
• Dedicated to the generator where required

Quiet 1800 RPM Operation

The Westerbeke 7.5 MCGB 7.5 combines several features intended to reduce operating noise and vibration:

• Low-speed 1800 RPM operation
• Smooth three-cylinder engine
• Electronic governing
• Flexible vibration isolators
• Freshwater-cooled exhaust manifold
• Water-injected exhaust system
• Heavy-duty industrial engine construction

Westerbeke describes the generator as smooth and quiet running, noting that comparable 3600 RPM engines are generally noisier and may require additional shielding to achieve similar sound levels.

Final onboard sound levels will also depend on the generator foundation, machinery-space insulation, ventilation openings, muffler selection, exhaust routing, hose support, and structural vibration transmission.

Optional Westerbeke Ventilated Enclosure

The 7.5 MCGB 7.5 is available with an optional Westerbeke ventilated enclosure, commonly referred to as the Venclosure.

Enclosure measurement	Specification
Length	30.3 in. / 768 mm
Width	21.6 in. / 550 mm
Height	18.8 in. / 477 mm
Approximate weight	20 lb. / 9 kg

Westerbeke specifies that the enclosure is not sold separately, so it should normally be selected when the generator is ordered.

The enclosure provides a finished protective installation while maintaining airflow around the generator. It does not replace correctly engineered machinery-space ventilation.

Dimensions and Installation Planning

The Westerbeke 7.5 MCGB 7.5 has the following published dimensions:

Measurement	Specification
Length	27.70 in. / approximately 703 mm
Width	18.40 in. / approximately 468 mm
Height	17.90 in. / approximately 455 mm
Dry weight	385 lb. / 174.6 kg
Raw-water connection	¾ in. / 19.1 mm
Exhaust connection	2 in. / 50.8 mm
Fuel-supply connection	¼ in. ID / 6.35 mm
Lubricating-oil capacity	3 US qt / 2.8 L
Cooling-system capacity	3.5 US qt / 3.31 L
Maximum operating angle	25° in all directions

These measurements are published for general reference. Westerbeke states that the detailed installation drawing should be used for final foundation design and connection placement.

Before installation, confirm:

• Machinery-space dimensions
• Mounting-hole positions
• Lifting and removal route
• Routine maintenance access
• Fuel-system compatibility
• Ignition-protected ventilation
• Raw-water intake arrangement
• Siphon-break requirement
• Exhaust-hose routing
• Starting-battery installation
• AC cable sizing
• Grounding and bonding
• Shore-power transfer switching
• Carbon-monoxide detector placement

Marine Applications

Gasoline-Powered Motor Yachts

The generator is particularly suitable for compatible vessels whose propulsion engines and onboard fuel systems already use gasoline.

Sport Cruisers

Its compact dimensions and low 1800 RPM operating speed make it suitable for cruisers requiring power for refrigeration, charging, pumps, lighting, electronics, and comfort systems.

Houseboats and Liveaboard Vessels

The 7.5 MCGB 7.5 may support compatible domestic appliances, refrigeration, freshwater systems, lighting, battery banks, outlets, and entertainment equipment.

Passenger and Hospitality Craft

The generator may provide auxiliary power for lighting, refrigeration, communication systems, pumps, entertainment equipment, and passenger-service loads.

Marine Generator Replacement

The 7.5 MCGB 7.5 may replace an existing gasoline generator when its voltage, frequency, electrical output, dimensions, weight, ventilation, fuel, cooling, exhaust, and control requirements are compatible.

Complete Technical Specifications

Specification	Details
Manufacturer	Westerbeke
Model	7.5 MCGB-614
Generator type	Multiport EFI Marine Gasoline Generator
Rated output	7.5 kW
Voltage	120V
Frequency	60 Hz
Phase	Single phase
Rated current	62.5 amps
Number of wires	Four
Power factor	1.0
Operating speed	1800 RPM
Engine cylinders	Three
Engine configuration	Vertical inline
Engine cycle	Four stroke
Aspiration	Naturally aspirated
Displacement	48.5 cu. in. / 0.795 L
Bore × stroke	2.70 × 2.83 in.
Compression ratio	9.0:1
Engine output	Approximately 13.2 hp
Fuel system	Sequential Multiport EFI
Fuel cooling	Water-cooled returnless system
Governor	Electronic
Alternator	Brushless, four pole
Voltage regulation	Approximately ±5%
Frequency regulation	Approximately 0.5 Hz
Cooling system	Freshwater with heat exchanger
Exhaust manifold	Freshwater-cooled aluminium
Starting system	12V electric, remote
Raw-water connection	¾ inch
Exhaust connection	2 inches
Dimensions	27.7 × 18.4 × 17.9 in.
Dry weight	385 lb. / 174.6 kg
Maximum operating angle	25° in all directions
Optional enclosure	Westerbeke Venclosure
Production status	Current production

The specifications are based on Westerbeke’s current product page and February 2026 advanced specification sheet. Final configuration should be confirmed against the serial-number-specific documentation before installation. 7.5 MCGB 7.5

Standard Equipment

Typical standard features include:

• Three-cylinder gasoline engine
• Sequential Multiport EFI
• Water-cooled returnless fuel system
• Electronic engine governor
• Low-CO exhaust system
• One-touch start-and-stop control panel
• Running-hour meter
• Warning-annunciation lights
• Automatic safety shutdowns
• Freshwater cooling
• Coolant-recovery tank
• AC output circuit breaker
• Integral starting-battery charger
• Water-injected exhaust elbow
• Belt-driven raw-water pump
• Vibration isolators
• Remote lubricating-oil filter
• Lubricating-oil drain hose
• Belt guard
• Operator’s manual
• Parts documentation

Westerbeke states that the model meets applicable US Coast Guard requirements, CARB and US EPA regulations, and is CE certified. It is also advertised with a five-year limited warranty, subject to the manufacturer’s registration, installation, application, and warranty conditions.

Optional Equipment

Available optional accessories include:

• Remote start-and-stop panel
• Extension wiring harness
• Ventilated enclosure
• SIDEX water-injected exhaust elbow
• Hydro-Hush muffler and fittings
• Anti-siphon valve with stainless-steel loop
• Ship-to-shore transfer switch
• Auxiliary DC power adapter
• Onboard spare-parts kit
• Extended-cruising spare-parts kit

Package contents and accessory availability should be confirmed when requesting a quotation.

Frequently Asked Questions

Is the Westerbeke 7.5 MCGB 7.5 a diesel generator?

No. It is a gasoline or petrol marine generator with sequential Multiport EFI.

How much power does the 7.5 MCGB-614 produce?

It produces 7.5 kW at 120V, 60 Hz and 1800 RPM, with a rated current of 62.5 amps.

Is the generator single phase?

Yes. The 7.5 MCGB-614 is rated as a 120V, four-wire, single-phase generator.

Does it use electronic fuel injection?

Yes. It uses sequential Multiport EFI for precise fuel delivery, easier starting, improved load response, and electronic diagnostics.

Is the generator electronically governed?

Yes. Electronic governing helps maintain 1800 RPM and stable 60 Hz frequency as electrical demand changes.

Is the Westerbeke 7.5 MCGB 7.5 freshwater cooled?

Yes. It uses freshwater cooling with a marine heat exchanger and freshwater-cooled exhaust manifold.

Is a carbon-monoxide detector required?

A functioning marine carbon-monoxide detector should be installed in all vessel living quarters. Low-CO technology reduces normal emissions but does not eliminate carbon monoxide.

Is a protective enclosure available?

Yes. An optional ventilated enclosure is available, but Westerbeke specifies that it is not sold separately.

Can the generator replace an older marine generator?

Potentially. Compatibility must be confirmed for fuel type, voltage, frequency, output, dimensions, weight, ventilation, exhaust, cooling, controls, and vessel wiring.

Request a Quote for the Westerbeke 7.5 MCGB 7.5-614

The New Westerbeke 7.5 MCGB 7.5-614 kW Multiport EFI Marine Generator combines compact dimensions, low-speed 1800 RPM operation, sequential electronic fuel injection, electronic governing, a water-cooled returnless fuel system, freshwater cooling, a brushless four-pole alternator, remote operation, and Low-CO marine technology.

It is a dependable choice for compatible gasoline-powered yachts and marine vessels requiring 120V, 60 Hz auxiliary electricity.

Contact our marine generator specialists to request the latest Westerbeke 7.5 MCGB 7.5-614 price, confirm current availability, select the correct optional accessories, and review compatibility with your vessel’s fuel, electrical, ventilation, cooling, and exhaust systems.