Marine Engine Collection of Mystic Seaport

Hercules Gas Engine Co. HK-7

Engine Builder: Hercules Gas Engine Co., Evansville, Illinois
Model: HK-7
Make: Hercules Gas Engine Co.
Inboard/Outboard: Stationary
Engine Type: Gasoline
Production Date: c. 1919
Engine Design: Four Stroke
Overall Condition: Good
Rebuilt/Restored: Untouched
Horsepower: 7.0
Cylinders: 1

Remarks: 4 cycle. Throttle governed , magneto ignition model with twin 34" diameter flywheels and belt drive takeoff drum. Painted green with red and white trim. Oiler and other details of brass. Mounted on oak skids. This engine is often called the "Hoop Shop" engine. Rated 7.0 hp at 175 rpm. (Can also be operated on Kerosene.) Has a Webster Tri-polar oscillator magneto, Webster Electronic Co., Racine, Wisconson. During 1990 operation, engine developed a cylinder head gasket leak, possibly allowing coolant into the combustion space. In February 1991, the engine was disassembled, when it was found that the gasket seating surfaces were in good condition, the leak being to the atmosphere only. At this time, it was decided to do a full disassembly of the engine and auxilliary equipment to determine the need for further repair. Bearing clearences were measured, and adjusted where necessary. Exterior surfaces were cleaned and painted. The extent and details of this overhaul were written up in a multi-page report to be filed under accession number 1985.40, and dated April 15, 1991. (Author: Matthews) Operation of the engine subsequent to the overhaul resulted in a discharge of carbureted fuel to the atmosphere from the air intake, thus spending operation. Correction of this problem is covered in an Addendum to the above report dated June 13, 1991. (Matthews)


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