Old Tacoma Marine, Inc.

yacht Thea Foss #1

Model #: 6HM1558 Engine #:
Bore & Stroke: 11 1/2" x 15" Cylinders: six
Horsepower: 275 RPM: 275
Current Owner: Foss Maritime Company link
Current Location: Seattle, Washington map
Current Condition: Operational

Engine History

The yacht Thea Foss is powered by twin 6HM1558 Atlas-Imperial diesel engines.

Engine Modifications

  • engine room controls have been replaced or altered to allow remote operation
  • de-rated from original factory specifications to produce 275 horsepower at 275 RPM