For the Gray cyclecar made in Colorado, see Gray Light Car. For Gray-Dort automobiles made in Canada, see Gray-Dort Motors.
Gray Marine Motor Company was a U.S. manufacturer of marine engines between 1910 and 1967. These ranged from one to six cylinders in both gas and later diesel layouts, which were used in pleasure boats, work boats, and military craft.
Gray also produced a line of outboard motors. Rather than a ninety-degree gearbox, a curved housing connected motor to propeller. The lower-unit housing contained a flexible inner rotating shaft.
In 1921 Frank L. Klingensmith, William Blackburn (from Cadillac) and Frank F. Beall (from Packard) took over the Gray Motor Company, renaming it Gray Motor Corporation with $4 million capital, with the intent of competing with Ford.[2] Two models of Gray car were made using the Beall developed Z motor. The Z engine was a 12-18 horsepower, 4 cylinder, L-head design that was said to resemble the model T Ford engine.
By 1924 the company was in poor financial condition and Mulford managed to buy back the marine engine division, re-establishing Gray Marine Motor Company. Gray Motor Corporation ceased producing cars by 1926.
Marine engines
The marine engine division continued operations for over forty years, and is most known for converting automotive engines for fishboats, cruisers and World War IIlanding craft, such as the Canadian Ramped cargo lighter and the famed Higgins boats. Gray built their own engines up to 1924, but converted automotive engines from about April 1924 on. During WWII, Gray Marine built 100 marinized GM style 71 series diesels a day using GM cylinder blocks.[1][3]
On June 14, 1944, the company was purchased by Continental Motors Company for $2.6 million. John W. Mulford, the son of O. Mulford, was made general manager of Gray. Gray continued to make marine engines in the post-war period until its closure by Continental in about 1967.