7.5 MCGA – 7.5 kW, 60 Hz low-CO Gas Generator

Description

New Westerbeke 7.5 MCGA 7.5 kW 60 Hz Low-CO Marine Gasoline Generator For Sale

Compact, Low-Speed Marine Power with Multiport EFI

The Westerbeke 7.5 MCGA 7.5 kW 60 Hz Low-CO Marine Gasoline Generator is a compact, low-profile generator designed to provide dependable onboard electricity for gasoline-powered motor yachts, sport cruisers, houseboats, passenger craft, and other compatible marine vessels.

Important correction: The Westerbeke 7.5 MCGA 7.5 is a gasoline or petrol generator, not a diesel generator. It uses sequential multiport electronic fuel injection, electronic governing, a water-cooled returnless fuel system, and Westerbeke Low-CO exhaust technology.

The 7.5 MCGA 7.5-614 delivers 7.5 kW at 120V, 60 Hz and 1800 RPM, with a rated current of 62.5 amps. Its three-cylinder industrial engine, brushless four-pole alternator, freshwater cooling, remote-start capability, safety shutdowns, and compact marine construction make it a practical source of auxiliary power for compatible vessels.

Its electrical output may support compatible onboard systems such as:

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

Actual suitability depends on the vessel’s continuous electrical demand, compressor and motor-starting loads, simultaneous equipment operation, and required reserve capacity.

A Marine Gasoline Generator, Not a Diesel Model

The Westerbeke 7.5 MCGA 7.5 Low-CO belongs to Westerbeke’s multiport EFI gasoline-generator range. It should only be installed in a vessel with a properly engineered marine gasoline fuel system, suitable ignition-protected components, adequate machinery-space ventilation, and a compliant wet-exhaust arrangement.

Correctly identifying the fuel type is essential when planning:

• Fuel-tank compatibility
• Fuel-hose selection
• Fuel filtration
• Machinery-space ventilation
• Ignition-protected electrical components
• Fire and explosion protection
• Exhaust-system routing
• Carbon-monoxide detection
• Installation-code compliance

A diesel fuel system cannot be used to operate this generator. The 7.5 MCGA 7.5 requires clean, correctly specified gasoline or petrol and approved marine fuel-system components.

Low-Profile Westerbeke Marine Engineering

Westerbeke developed the 7.5 MCGA 7.5 as a compact, low-speed gasoline generator capable of delivering useful electrical output without requiring a high-speed 3600 RPM engine.

Its 1800 RPM operating speed allows the generator to produce 60 Hz electricity while running at half the speed of many small two-pole gasoline generator sets. The lower speed, combined with its heavy-duty industrial engine platform, contributes to smooth operation, reliability, and extended service life.

Marine-specific features include:

• Sequential multiport electronic fuel injection
• Water-cooled returnless fuel system
• Electronic engine governing
• Low-CO exhaust treatment
• Freshwater cooling with heat exchanger
• Water-injected exhaust elbow
• Belt-driven raw-water pump
• Brushless four-pole alternator
• Remote start-and-stop capability
• AC output circuit breaker
• Automatic safety warnings and shutdowns
• Flexible vibration isolators
• Lubricating-oil drain hose
• Optional ventilated enclosure

These features make the generator suitable for new-vessel installations and compatible marine generator replacement projects.

Three-Cylinder Gasoline Engine Performance

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

The engine develops approximately 13.2 hp at 1800 RPM and uses a 9.0:1 compression ratio. Its construction includes 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
Rated output	Approximately 13.2 hp
Rated speed	1800 RPM
Fuel system	Sequential Multiport EFI
Governor	Electronic
Starting system	12V electric
Electrical ground	Negative

The three-cylinder arrangement provides smoother power delivery than many compact single-cylinder or twin-cylinder generator platforms. Combined with the lower engine speed and electronic governing, it helps reduce noticeable vibration and engine-speed fluctuation as electrical loads change.

7.5 kW Electrical Output at 60 Hz

The Westerbeke 7.5 MCGA 7.5-614 produces 7.5 kW of single-phase electrical power at 60 Hz.

Electrical specification	Rating
Generator model	7.5 MCGA-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

The generator is a 120V, four-wire, single-phase model. The alternator platform is reconnectable, but the vessel’s required output arrangement must be confirmed before installation or reconnection.

A professional marine electrical load assessment should account for:

• Total continuous load
• Air-conditioning compressor startup
• Refrigeration compressor startup
• Pump and electric-motor starting current
• Battery-charger demand
• Simultaneous appliance use
• Generator operating reserve
• Planned future electrical additions

Electric motors and compressors may temporarily draw several times their normal running current during startup. A generator may therefore have sufficient capacity for the equipment’s running load but still experience difficulty if several high-demand systems start simultaneously.

Field-Convertible 50 and 60 Hz Platform

Westerbeke describes the 7.5/6.2 MCGA platform as field-convertible between 50 and 60 Hz.

In its 60 Hz configuration, the generator is rated at 7.5 kW and 1800 RPM. In its 50 Hz configuration, the corresponding model is rated at 6.2 kW, 230V and 1500 RPM.

Frequency conversion should not be treated as a simple adjustment. It may require changes to engine speed, control settings, output connections, circuit protection, identification labels, and vessel electrical distribution. 7.5 MCGA 7.5

Any conversion should be performed by a qualified Westerbeke technician using approved procedures and should include confirmation that all connected onboard appliances are compatible with the resulting voltage and frequency.

Sequential Multiport Electronic Fuel Injection

A major feature of the 7.5 MCGA 7.5 is its sequential multiport electronic fuel-injection system, commonly known as Multiport EFI or MPI.

Instead of relying on a conventional carburettor, the system electronically meters fuel to the engine’s intake ports. The principal benefits include easier starting, efficient fuel delivery, improved reliability, reduced emissions, consistent engine response, and advanced diagnostic capability.

Potential operational benefits include:

• Easier cold and warm starting
• More precise air-to-fuel control
• Improved response to changing electrical loads
• Reduced fuel-related hesitation
• Lower normal exhaust emissions
• Electronic fault monitoring
• Improved performance at different operating temperatures

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

Water-Cooled Returnless Fuel System

Gasoline may vaporise when subjected to high machinery-space temperatures. This can interfere with fuel delivery and contribute to vapor lock, difficult starting, or unstable operation.

The Westerbeke 7.5 MCGA 7.5 uses a water-cooled returnless fuel system designed to help control fuel temperature and improve operation in high ambient conditions.

A safe marine gasoline installation should include:

• Approved gasoline-resistant marine fuel hose
• Correctly sized fuel-supply line
• An accessible shutoff valve
• Suitable fuel filtration
• Secure and leak-free fittings
• Proper grounding and bonding
• Ignition-protected electrical components
• Correct machinery-space ventilation
• Regular leak inspection

The generator’s published fuel-supply connection is approximately ¼-inch internal diameter. Gasoline-system installation and servicing should be performed by a qualified marine technician. 7.5 MCGA 7.5

Westerbeke Low-CO Technology

The Low-CO designation does not mean that the generator produces no carbon monoxide. Carbon monoxide remains a colourless, odourless, poisonous gas that can cause serious injury or death.

Westerbeke’s system reduces normal CO levels by precisely controlling the engine’s air-to-fuel ratio and treating the exhaust through a specialised catalyst. The actual CO level may change according to electrical load, fuel-system condition, sensor operation, air supply, engine condition, and catalyst performance.

Every installation should include:

• Approved marine carbon-monoxide detectors
• Correct detector placement
• Proper machinery-space ventilation
• A leak-free exhaust system
• Correct exhaust-outlet positioning
• Regular catalyst inspection
• Fuel- and air-system maintenance
• Periodic CO testing with an appropriate analyser

Operators should never rely on outdoor dilution as the primary safeguard against CO exposure. Should a CO alarm activate, the generator and propulsion engines should be stopped, the vessel should be evacuated and ventilated, and professional assistance should be obtained. 7.5 MCGA 7.5

Catalyst Inspection and CO Verification

The catalyst is an essential component of the generator’s Low-CO system. Water intrusion, poor fuel control, contaminated intake air, or deterioration with operating hours may reduce its effectiveness.

The catalyst should be inspected regularly, and exhaust CO levels should be checked using a suitable analyser according to Westerbeke’s maintenance requirements.

When assessing a used generator, confirm:

• Total operating hours
• Catalyst inspection history
• CO-test records
• Evidence of seawater intrusion
• Fuel-filter maintenance
• Air-intake condition
• Exhaust-elbow condition
• Control-system fault history

A Low-CO generator should never be operated with a damaged catalyst, leaking exhaust system, faulty fuel-control component, or inoperative CO detector.

Electronic Governing for Stable Frequency

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

When a pump, compressor, charger, or other major load starts, the generator engine experiences an immediate increase in mechanical demand. The governor adjusts engine operation to reduce speed loss and maintain electrical frequency.

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

Stable frequency supports the reliable operation of compatible:

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

Electronic governing improves transient-load response but cannot compensate for continuous generator overloading or incorrect system sizing.

Brushless Four-Pole Alternator

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

Published alternator features 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.

Proper vessel grounding, cable separation, circuit protection, and installation remain necessary for dependable electrical performance.

Freshwater Cooling with Marine Heat Exchanger

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

Engine coolant circulates internally through the cylinder block, cylinder head, and freshwater-cooled exhaust manifold. Raw water drawn from outside the vessel removes heat through the exchanger before being discharged through the water-injected exhaust system.

The cooling arrangement includes:

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

The published cooling-system capacity is approximately 3.5 US quarts or 3.31 litres.

Routine maintenance should include inspection of:

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

Incorrect wet-exhaust design can allow seawater to enter the exhaust manifold or catalyst and cause serious damage.

Approximate Fuel Consumption

Westerbeke publishes the following approximate gasoline-consumption figures for the 7.5 MCGA 7.5 at 1800 RPM:

Generator load	Approximate fuel 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 will vary according to connected electrical demand, engine condition, fuel quality, machinery-space temperature, ventilation, installation, and maintenance.

One-Touch Control and Remote Starting

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

Remote starting is supported, and an optional remote start-and-stop panel may be installed at the helm, electrical panel, saloon, or another convenient location.

The generator’s standard control and protection package includes:

• Start-and-stop control
• Running-hour meter
• Warning-annunciation lights
• AC circuit breaker
• Electronic engine control
• Automatic safety shutdowns
• Integral battery charger
• Remote-control capability

Automatic Safety Warnings and Shutdowns

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

Published protection includes:

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

These protections reduce the risk of major engine or generator damage but do not replace regular inspections of oil, coolant, raw-water flow, exhaust components, fuel connections, ventilation, wiring, and CO detectors. 7.5 MCGA 7.5

Integral Battery-Charging System

The 7.5 MCGA 7.5 includes an integral 12-amp battery charger for the generator’s dedicated starting battery.

The generator starting battery should be:

• Correctly sized
• Dedicated to the generator where required
• Properly secured
• Protected by suitable switching and circuit protection
• Connected using correctly sized marine-grade cables
• Regularly checked for charge and corrosion

The published minimum cranking requirement is approximately 120 amps at 70°F.

Quiet 1800 RPM Operation

The 7.5 MCGA combines several features intended to reduce 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
• Compact industrial engine construction

Final onboard sound levels will also depend on:

• Generator foundation
• Machinery-space insulation
• Ventilation openings
• Muffler selection
• Exhaust-hose routing
• Flexible connections
• Structural vibration transmission
• Optional enclosure selection

Optional Westerbeke Ventilated Enclosure

The 7.5 MCGA 7.5 can be ordered with an optional Westerbeke ventilated enclosure, also called a 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

The enclosure provides a finished protective installation while maintaining the ventilation required by the gasoline generator. It does not replace correctly engineered machinery-space airflow or ignition-protected ventilation.

Dimensions and Installation Planning

The Westerbeke 7.5 MCGA 7.5 has the following approximate dimensions:

Measurement	Published specification
Length	27.70 in. / approximately 704 mm
Width	18.40 in. / approximately 467 mm
Height	17.90 in. / approximately 455 mm
Dry weight	385 lb. / 174.6 kg
Exhaust connection	2 in. / 50.8 mm
Raw-water connection	¾ in. / 19.1 mm
Fuel-supply connection	¼ in. ID / 6.35 mm
Maximum operating angle	25° in all directions
Lubricating-oil capacity	3 US qt / 2.8 L
Cooling-system capacity	3.5 US qt / 3.31 L

The approved installation drawing should be used for final foundation design, hose placement, service clearance, lifting access, and connection positions.

Before installation, confirm:

• Machinery-space dimensions
• Mounting-hole locations
• Generator lifting and removal route
• Routine service access
• Fuel-system compatibility
• Ignition-protected ventilation
• Raw-water intake arrangement
• Siphon-break requirements
• Wet-exhaust routing
• Starting-battery cable size
• AC output cable size
• Grounding and bonding
• Shore-power transfer arrangement
• Carbon-monoxide detector placement

Applications of the Westerbeke 7.5 MCGA

Gasoline-Powered Motor Yachts

The generator is particularly suitable for vessels whose propulsion engines and fuel storage arrangements already use gasoline.

Sport Cruisers

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

Houseboats and Liveaboard Vessels

The 7.5 MCGA 7.5 may support compatible refrigerators, freshwater systems, lighting, battery banks, electrical outlets, entertainment equipment, and selected domestic appliances.

Passenger and Hospitality Craft

It may provide auxiliary electricity for lighting, refrigeration, communications, pumps, entertainment equipment, and passenger-service systems.

Marine Generator Replacement

The 7.5 MCGA 7.5 may replace an older gasoline generator where output, voltage, frequency, dimensions, weight, ventilation, exhaust, cooling, fuel, and electrical requirements are compatible.

Complete Technical Specifications

Specification	Details
Manufacturer	Westerbeke
Model	7.5 MCGA-614 Low-CO
Generator type	Marine Gasoline/Petrol Generator
Rated output	7.5 kW
Voltage	120V
Frequency	60 Hz
Phase	Single phase
Rated current	62.5 amps
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
Low-CO system	Electronic air/fuel control and catalyst
Governor	Electronic
Alternator	Brushless, four pole
Voltage regulation	Approximately ±5%
Frequency regulation	Approximately 0.5 Hz
Cooling	Freshwater with heat exchanger
Raw-water pump	Belt driven
Starting system	12V electric, remote
Battery charger	12 amps
Raw-water connection	¾ inch
Exhaust connection	2 inches
Approximate dimensions	27.7 × 18.4 × 17.9 in.
Approximate dry weight	385 lb. / 174.6 kg
Maximum operating angle	25° in all directions
Optional enclosure	Westerbeke Venclosure

Standard Equipment

Typical standard equipment includes:

• Three-cylinder gasoline engine
• Sequential multiport EFI
• Water-cooled returnless fuel system
• Low-CO exhaust catalyst system
• Electronic engine governor
• One-touch start-and-stop panel
• Running-hour meter
• Annunciation lights
• Safety warnings and shutdowns
• Freshwater cooling
• Coolant-recovery tank
• AC circuit breaker
• 12-amp battery charger
• Water-injected exhaust elbow
• Belt-driven raw-water pump
• Flexible vibration isolators
• Lubricating-oil drain hose
• Belt guard
• Remote lubricating-oil filter
• Operator’s manual
• Parts documentation

Optional Equipment

Available options may include:

• Remote start-and-stop panel
• Ventilated enclosure
• Rear or side exhaust configuration
• Ship-to-shore transfer switch
• Hydro-Hush muffler
• Anti-siphon valve
• Technical manual
• Auxiliary DC power adapter
• Onboard spare-parts kit
• Extended-cruising spare-parts kit

The required exhaust orientation and optional enclosure should be specified before ordering because installation space and hose-routing requirements can differ. 7.5 MCGA 7.5

Frequently Asked Questions

Is the Westerbeke 7.5 MCGA 7.5 a diesel generator?

No. It is a gasoline or petrol marine generator with sequential multiport electronic fuel injection and Low-CO exhaust technology.

How much electrical power does it produce?

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

What does Low-CO mean?

Low-CO means the generator uses precise electronic air-to-fuel control and a catalyst to reduce normal carbon-monoxide emissions. It does not eliminate CO or make the exhaust safe to breathe. 7.5 MCGA 7.5

Does the generator require a carbon-monoxide detector?

Yes. A functioning marine CO detector is essential. Untreated exhaust leaks remain extremely dangerous even though the generator is designed to reduce normal CO output.

Does the catalyst require maintenance?

Yes. The catalyst should be inspected regularly, and exhaust CO levels should be periodically verified using a suitable analyser.

Is the 7.5 MCGA 7.5 electronically governed?

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

Is the generator freshwater cooled?

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

Is a protective enclosure available?

Yes. Westerbeke offers an optional ventilated enclosure for the 7.5/6.2 MCGA generator platform.

Can the 7.5 MCGA 7.5 replace another marine generator?

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

Request a Quote for the Westerbeke 7.5 MCGA

The New Westerbeke 7.5 MCGA 7.5 kW 60 Hz Low-CO Marine Gasoline Generator combines compact dimensions, smooth 1800 RPM operation, sequential multiport EFI, electronic governing, a water-cooled returnless fuel system, freshwater cooling, a brushless four-pole alternator, and catalytic Low-CO technology.

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

Contact our marine generator specialists to request the latest Westerbeke 7.5 MCGA 7.5 price, confirm stock availability, select the correct exhaust configuration and optional enclosure, and review compatibility with your vessel’s fuel, electrical, ventilation, cooling, and exhaust systems.