I learned about the use of a mechanic’s stethoscope from the team leader, En. Heryadi. A mechanic's stethoscope is used to listen to and track noises found within an engine. Typically made out of chrome-plated steel, with PVC, or polyvinyl chloride, hoses, and rubber earpieces, it can come in handy for both the professional mechanic.
Mechanic's stethoscopes can aid in inspecting various car parts, including the transmission, transfer case, valve train, rear axle, and the engine itself. Even problems within the dashboard may be located by utilizing this tool. Worn gears or a water pump failure that may otherwise be challenging to identify can often be located quickly using a stethoscope, making troubleshooting a machine a much easier task.
Tracking down hard-to-find leaks is another function of the mechanic's stethoscope. The tool can actually help a mechanic hear a leak without seeing it, such as in the case of a damaged head gasket. By following the sound of steam, gas, water flow, or oil, problems can be easily isolated, allowing the mechanic to make a timely diagnosis and commence repairs. In this light, the mechanic's stethoscope also proves useful in checking the vacuum and pressure flow of a vehicle — as well as synchronizing multiple carburetors for optimal power and function.
Figure 27: Mechanic’s Stethoscope