Automotive machine shops serve many purposes and offer many services that a mechanic might need. Most of these things require special equipment and precision tools that are cost prohibitive to the average automotive shop. From precision machining to custom hydraulic lines and fittings, these services are a key part of custom work on cars, trucks, and other automotive applications Chemical Cleaning and Inspection When an engine is rebuilt or overhauled by a mechanic, there are some important parts that need to be prepped before assembling the new engine.