A professional who positions, fits, and secures engine parts to erect in-line, V-type, or radial diesel engines according to specifications, using machinist's handtools, surface plate, torque wrench, parallel supports, and measuring instruments. Respnsibilities include:

• Aligns vertical columns over bedplate between A-frames, using transit and levels and secures columns with tie rods to form frame of engine.
• Positions engine parts and assemblies, such as valve lever assembly, pistons, connecting rods, cylinder liners, cylinder heads, camshaft housing, crankshaft, journals, fuel injection pump, fuel nozzles, and blowers with help of other workers or overhead crane.
• Reams or hones holes for fitted bolts.
• Files, scrapes, drills, taps, dowels, and shims parts, such as cylinder liners, keys, and matching parts.
• Measures clearances and dimensions, using scales, micrometers, combination square, feeler gauge, and dial indicator.
• Turns screws to adjust fuel rack and governor, using wrenches and screwdriver, and aligns timing marks on crankshaft, camshaft, and flywheel.
• Installs and connects fuel, lubrication, and cooling piping, using pipe benders, cutters, and threaders.
• Connects engine to test equipment, such as dynamometer, and runs engine for specified time to test horsepower at designated revolutions per minute.
• May disassemble engine for shipping.