Diesel 11.5 BTD

Westerbeke diesel generators run at a smooth and quiet 1800 RPM. Operating at this low speed ensures greater reliability, less maintenance, longer engine life, and lower noise levels. All are essential in the marine environment

SKU: 115BTD Category:



Cylinders: 3
Length: 31.50 in.
Bore: 3.07 in.
Width: 19.10 in.
Stroke: 3.62 in.
Height: 24.00 in.
Displacement: 80.43 cu. in.
Weight: 513.00 lbs.
Aspiration: Natural


Advanced Specifications

      11.5-9.2 BTD Spec 1-11.pdf

Manuals (Operators, Parts, Technical, Installation)

      11_11_5_12_6_BTD PARTS_LIST_48505 REV E.pdf

      11_5_12_6_BTD PARTS_LIST_48505 REV D.pdf

      Installation Manual – Marine Engines & Generators

      44800 Rev 3 8.0 BTDA-15.0 BTDC Oper Man.pdf

      MANUAL_SERVICE_35E_44C_8-15 BTDC_45100_REV_2.pdf

      Westerbeke Superseded Parts Listing

Guides (Troubleshooting)

      BT Troubleshooting Guide 6 and 12 Stud March 2014.pdf

Diagrams (Wiring, Installation)

      8.0-15.0_BTDC_EG_SRC_REV C(44927)

      ENGINEER – 11.0 BTDB_47847_REV D.pdf

Bulletins (Service, Parts)

      Parts Bulletin 2004-3 REVISED: Alternator 030594

      Parts Bulletin 2013-2: Piston and Rings Change

      Parts Bulletin 2008-4: Paint Storage
Applies To: All Models<

      Service Bulletin #242: Manufacture Date Code

      Parts Bulletin 2007-2: Fuel Filter 030200

      Service Bulletin #250: BT Generators

      Service Bulletin #175: Fuel Solenoid Wiring

      Service Bulletin #125: Oil Pressure Switches


Please Note: While every attempt is made to ensure the information on this site is accurate, this data is provided for information purposes only and is subject to change.

Additional information

Weight 513 lbs


Run Type





80.43 cu. in.


513.00 lbs.


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