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8.9 BTDAR - 50 Hz

Cylinders: 3
Bore: 3.07 in.
Stroke: 3.62 in.
Displacement: 80.43 cu. in.
Aspiration: Natural

Length: 37.68 in.
Width: 20.01 in.
Height: 26.14 in.
Weight: 560.00 lbs.

Years of Sea Duty Bring Unmatched Reliability On-Shore

Proven power with field tested reliability
The 8.9 BTDR is a small 3 cylinder work horse in the Westerbeke mobile line of diesel generators.  Air tuning, a cast iron block, and 1500 rpm mean increased power, longevity and smooth, quiet operation.  Each 8.9 BTDR draws on field tested design experience gained supplying generators to the United States Navy, United States Coast Guard, and all the major U.S. Fire Apparatus Builders.

Lightweight, Ready to go operation and Convenient single side service
38.7 amps and only 560 pounds, full instrumentation, optional one button start remote controls and glow plugs for all weather operation make the 8.9 BTDR ready to go when you need it.  And when you need to perform scheduled preventative maintenance easy single side serviceability makes the job a snap.

Full torque, Full power PTO for power/rescue options
The 8.9 BTDR has the exclusive PTO to drive special options for power and rescue.  Use the PTO to power high output DC alternatiors, or add an electric clutch and drive a compressor to bring air to the scene.  Add the XRT Combi package to the 8.9 BTDR and you have a combination power rescue package for all your electrical and rescue tool needs.

Clean Machines
The 8.9 BTDR is a clean machine.  The diesel power plant meets all EPA and CARB emission regulations and the generator produces clean stable electricity from a 4 pole backend that is electronically governed and regulated.

Generator Set Benefits

  • Compact lightweight design
  • Quiet: runs at 1800 RPM (60 HZ) or 1500 RPM (50 HZ)
  • Tuned air intake silencer
  • Frequency regulation to 0.5 HZ (0.6%) with electronic governing (standard) 
  • Built-in power take off capable of full engine torque
  • Multi-station remote starting capability
  • Easy-to-read operator’s manual and parts list
  • Emergency stop switch
  • Steel mounting skid
  • Electronic governor (standard)
  • User-friendly trouble-free controls
  • Optimum vibration isolation

Engine Features

  • Low maintenance costs
  • Low fuel consumption
  • Self-bleeding fuel system
  • Easy one-side servicing
  • Water-cooled cast iron block for a longer life
  • Cooling designed for high ambient temperatures
  • 12 volt starter motor
  • 12 volt 50 ampere alternator
  • Electric fuel pump
  • Safety shutdowns: High water temperature, Low oil pressure
  • Glow plugs for cold weather starting
  • Built-in lube oil drain hose
  • Dry element air filter
  • Full flow lube oil filter
  • Coolant overflow kit
  • Full engine instrumentation: Water temperature, Oil pressure, Hour meter, DC voltmeter

Generator Features

  • Compact lightweight design
  • Brushless – revolving field
  • Single phase
  • Class H insulation
  • Conforms to NEMA temperature rise standards
  • Easy field conversion: 60 HZ or 50 HZ AC output






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 12/1/2013
Manuals (Operators, Parts, Technical, Installation)
Document Name Publication Date
  Westerbeke Superseded Parts Listing August 2015 8/1/2015
  Operator's Manual 049120 8/1/2003
  Installation Manual - Diesel Generators for Mobile Applications 6/1/1999
Guides (Troubleshooting)
Document Name Publication Date
Diagnostic Software
No matching records found
Diagrams (Wiring, Installation)
Document Name Publication Date
  Wiring Diagram 054031 4/21/2010
  Wiring Diagram 044969 2/19/2009
  Installation Drawing 47874 N/A
Bulletins (Service, Parts, Product Recalls)
Document Name Publication Date
  Parts Bulletin 2013-2: Piston and Rings Change

Applies To:

  Parts Bulletin 2008-4: Paint Storage

Applies To: All Models

  Service Bulletin #250: BT Generators

  Service Bulletin #242: Manufacture Date Code

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

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