A Day in the Life: The essential functions of this role are as follows: Rebuild, replace, and/or repair major parts on cars and light trucks, heavy-duty trucks, and heavy equipment (e.g., exhaust system, fuel injection, electrical systems, transmission, drive train, mechanical and air suspension, charging systems, air, and hydraulic brakes). You may also assist in major overhauls of gasoline or diesel engines, and repair difficult and complex automotive problems (i.e., replacement or repair of pistons, rings, crankshafts, medium and heavy-duty automatic transmissions, single and twin countershaft manual transmissions).