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4.2 MCGA Multiport EFI - 50 Hz

Cylinders: 3
Bore: 2.70 in.
Stroke: 2.83 in.
Displacement: 48.50 cu. in.
Aspiration: Natural

Length: 26.40 in.
Width: 18.40 in.
Height: 17.90 in.
Weight: 343.00 lbs.

Our Newest Multiport Electronic Fuel Injection!

Low-Profile, Low-Speed, High Performance
The Westerbeke 4.2 MCGA marine gasoline generator is compact, quiet and operates at low-speed to reduce noise. Westerbeke's unique marine design results in a high-performance generator with precise speed control and excellent fuel economy. The low operating speed of the Westerbeke 4.2 MCGA combined with a heavy-duty industrial base engine contribute to a longer lasting, more reliable product.

Multiport EFI and Return-less Fuel System
The Westerbeke 4.2 MCGA features sequential multiport electronic fuel injection (EFI). Multiport EFI provides optimum fuel efficiency, easy starting, improved reliability and reduced emissions. In conjunction with Multiport EFI, electronic speed control maintains the engine at a constant speed (precise frequency regulation) and virtually eliminates “bogging down” when load is applied. A water-cooled return-less fuel system aids in the prevention of vapor lock for improved performance in high ambient temperatures. Multiport EFI also features advanced diagnostic capabilities.

Smooth and Quiet Operation
Featuring a 3-cylinder engine with a balance shaft that virtually eliminates vibration, the Westerbeke 4.2 MCGA is an extremely smooth running 4.2 kW. The engine also operates at an electronically controlled 1500 rpm for exceptionally quiet operation.

Five Year Limited Warranty
The 4.2 MCGA is backed by Westerbeke's 5-year limited warranty. The presence of Westerbeke in over 65 countries around the world provides customers with easy access to parts, service and technical support. Established in 1937, Westerbeke is committed to providing its customers with quality products and unequaled after sales support.

Standard Features

  • Simple, "one-touch" start/stop control panel
    with running hour meter and LED lights
  • Multiport electronic fuel injection
  • Water-cooled returnless fuel system
  • Electronic governing
  • Safety shut-downs-overspeed, low oil
    pressure, high exhaust temperature and more
  • Fresh water cooling and coolant recovery tank
  • Field convertible to 50 or 60Hz
  • A.C. circuit breaker
  • 12 amp battery charger
  • Water injected exhaust elbow
  • Belt-driven, raw water pump
  • Vibration isolators
  • Lube oil drain hose
  • Belt guard
  • Operators' manual and parts list
  • EPA & CARB compliant
  • Meets U.S.C.G. regulation 33CFR-183
  • CE certified

Optional Equipment

  • Remote start/stop panel
  • Remote lube oil filter
  • Ship-shore transfer switch
  • Hydro-hush muffler
  • Ventilated Enclosure
  • Anti-siphon valve
  • "A" on board spare parts kit
  • "B" extended cruising spare parts kit





Technical Documents

Important Note: Technical information is provided on our website for your reference and convenience. Westerbeke recommends that your engine, generator or climate control system is serviced and/or installed only by an authorized Westerbeke distributor or dealer. Click here to locate the Master Distributor or Dealer for your area.

Advanced Specifications
Document Name Publication Date
  Advanced Specifications 4/1/2019
Manuals (Operators, Parts, Technical, Installation)
Document Name Publication Date
  Parts Manual 056557 10/1/2018
  Ventilated Enclosure - Installation and Parts Manual 056816 10/1/2018
  Operator's Manual 056556 8/1/2018
  Installation Manual - Marine Engines & Generators 6/1/2016
  Westerbeke Superseded Parts Listing August 2015 8/1/2015
Guides (Troubleshooting)
Document Name Publication Date
Diagnostic Software
Document Name Publication Date
  EC11_Download 8/1/2021
Diagrams (Wiring, Installation)
Document Name Publication Date
  ENGINEER - 5.0 MCGA-4.2 MCGA Installation Drawing 56571REV_- 6/19/2018
  Installation Drawing - Gasoline Ventilated Enclosure 056878 6/5/2018
  Wiring Diagram 056558 8/8/2017
Bulletins (Service, Parts, Product Recalls)
Document Name Publication Date
  Parts Bulletin 2021-1-Fuel-Pumps-v2.4-(2021-08-16)_

  Parts Bulletin 2008-4: Paint Storage

Applies To: All Models





Buy and View Parts Below : Click each image for a larger view and detailed list of the parts for that section. If images do not appear under a "Complete Parts Lists" heading, please scroll down to access the parts related information available for this model.


Download Parts Documentation
Document Name Publication Date
  Parts Manual 056557 10/1/2018
  Ventilated Enclosure - Installation and Parts Manual 056816 10/1/2018
Superseded Parts List
Document Name Publication Date
  Westerbeke Superseded Parts Listing August 2015 8/1/2015