A professional who repairs and adjusts electrical and mechanical equipment of gasoline- or diesel-powered inboard or inboard-outboard boat engines, using handtools, power tools, and electrical testing meters. Respnsibilities include:

• Starts motor and listens to its sound to determine causes of trouble.
• Tests motor for conformance to manufacturer's specifications, using electrical testing meters.
• Dismantles motors, using handtools, and examines parts for defects.
• Adjusts generator and replaces faulty wiring, using handtools and soldering iron.
• Installs piston rings, adjusts carburetor, grinds valves, and repairs or replaces reduction gears, and other parts, using lathe, drill press, handtools, and power tools.
• Examines propeller and propeller shafts and repairs defective parts.
• Aligns engine to propeller shaft.
• May operate boat on water to test repairs.
• May repair only mechanical equipment of engines, such as power-tilt, bilge pumps, or power take-offs.
• May be designated according to type of engine repaired as inboard motorboat mechanic; inboard/outboard motorboat mechanic.