Exclusively designed for marine applications, Universal boat engines represent a breakthrough in marine diesel engine compactness, quietness, and reliability.

SKU: m320B Category:



Cylinders: 3
Length: 26.40 in.
Bore: 2.64 in.
Width: 18.80 in.
Stroke: 2.68 in.
Height: 20.10 in.
Displacement: 43.80 cu. in.
Weight: 241.00 lbs.
Aspiration: Natural


Advanced Specifications

      UNIVENG, M3-20B.pdf

Manuals (Operators, Parts, Technical, Installation)

      Installation Manual – Marine Engines & Generators

      200550 Ed. 2 Universal M3-20B through M-50B Operator Manual.PDF



      Universal Superseded Parts Listing

Diagrams (Wiring, Installation)



      12B-82B, 108C (Revision J)

      12B-82B, 108C (Revision K)

      12B-82B, 108C (Revision L)

      ENGINEER – M3-20B ZF 10 M.pdf

Bulletins (Service, Parts)

      Service Bulletin #242: Manufacture Date Code

      Parts Bulletin 2007-1: Part Number Errors M3-20B

      Service Bulletin #236: Universal Propulsion R.P.M. Ranges

      Service Bulletin #155: Keyswitch

      Service Bulletin #136: Shift Lever

      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 241 lbs


Run Type



There are no reviews yet.

Be the first to review “M3-20B”

Your email address will not be published. Required fields are marked *

Copyright Anthony Keats Marine | Website Design By Cowlick Studios