Tests motor for conformance to specifications and operations, while motor is running in tank, using tachometers, monometers, voltmeters, ammeter, and stroboscope.

Examines propeller and propeller shafts, and aligns, repairs, or replaces defective parts.

Starts motor and listens to and inspects it for signs of malfunctioning, such as smoke, excessive vibration, misfiring, and missing or broken parts.

Adjusts generator and replaces faulty wiring, using hand tools and soldering iron.

Writes test report to indicate acceptance or reason for rejection of motor.

Mounts motor to boat and operates boat at various speeds on waterway to conduct operational tests.

Sets starter lock, and aligns and repairs steering or throttle controls, using gauges, screwdrivers, and wrenches.

Operates machine tools, such as lathes, mills, drills, and grinders, to repair or rework parts, such as cams, rods, crankshaft, and propeller.

Adjusts carburetor mixture, electrical point settings, and timing, while motor is running in water-filled test tank.

Analyzes test results, and disassembles and inspects motor for defective parts, using mechanic's hand tools and gauges.

Replaces parts, such as gears, magneto points, piston rings, and spark plugs, and reassembles engine.

Repairs mechanical equipment of engines, such as power-tilt, bilge pumps, or power take-offs.

Idles motor and observes thermometer to determine effectiveness of cooling system.