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12D Two *For Export Only

Cylinders: 2
Bore: 2.99 in.
Stroke: 2.76 in.
Displacement: 38.75 cu. in.
Aspiration: Natural

Length: 24.50 in.
Width: 20.00 in.
Height: 20.30 in.
Weight: 225.00 lbs.

IMPORTANT NOTE: This engine is for export only and cannot be shipped within the United States

Two cylinder, four cycle smoothness in a lightweight, compact engine

Our newest most compact marine diesel engine

The Westerbeke 12D Two engine has an extremely small envelope (combined length, width, height). This lightweight low profile engine is designed to fit into the smallest of engine compartments. The 12D Two is engineered by Westerbeke, pioneers in marine diesel engines, to provide consistent performance, quietness, durability and above all reliability, year after year.

The engine is easy to install, economical to operate, and convenient to service. A full range of options is available allowing you to custom tailor your engine to fit your individual requirements.

Standard Equipment
  • Fresh water cooling
  • Engine prewired to plug-in connector
  • Self-bleeding fuel system
  • 12 volt 50 ampere alternator
  • Domestic hot water connections
  • Coolant recovery tank
  • Throttle, stop, and shift control brackets
  • Low oil pressure and high water temperature alarms
  • Gear-driven sea water pump
  • Mechanical marine gear with 2.05:1 reduction
  • Glow plug cold starting aid
  • Four point adjustable flex mounts
  • Lube oil drain hose
  • Tuned air intake silencer
  • Operator’s Manual and Parts List
Optional Equipment
  • Admiral panel with alarms (tachometer with gauges)
  • Dual station senders
  • Other gear ratios - Consult local distributor
  • Remote expansion tank
  • Fuel filter/water separator
  • Muffler and fittings
  • "A" on board spare parts kit
  • "B" extended cruising spare parts kit
  • Anti-siphon valve for overboard cooling discharge water
  • Technical Manual
  • Exhaust connection (water injected 90° , 45° elbows & riser)
  • Propeller shaft couplings (rigid/flexible)




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 1/1/2011
Manuals (Operators, Parts, Technical, Installation)
Document Name Publication Date
  Installation Manual - Marine Engines & Generators 6/1/2016
  Westerbeke Superseded Parts Listing August 2015 8/1/2015
  Technical Manual 055411 6/1/2012
  Operator's Manual 039717 1/1/2011
  Parts Manual 039721 10/1/1994
Guides (Troubleshooting)
No matching records found
Diagnostic Software
No matching records found
Diagrams (Wiring, Installation)
Document Name Publication Date
  Installation Drawing 56052 7/21/2015
  Wiring Diagram 039144 Revision N 8/7/2008
Bulletins (Service, Parts, Product Recalls)
Document Name Publication Date
  Parts Bulletin 2010-2: Piston Wrist Pin Size Change

Applies To:

  Parts Bulletin 2008-4: Paint Storage

Applies To: All Models

  Parts Bulletin 2007-2: Fuel Filter 030200

Applies To:

  Service Bulletin #242: Manufacture Date Code

  Service Bulletin #238: Fuel Pump Inlet Filter Part Number 048076

  Service Bulletin #155: Keyswitch

  Service Bulletin #136: Shift Lever

  Service Bulletin #125: Oil Pressure Switches





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 039721 10/1/1994
Superseded Parts List
Document Name Publication Date
  Westerbeke Superseded Parts Listing August 2015 8/1/2015