Diagnosing Diesel Generator Faults by Sound: Practical Experience Sharing   In daily operation, a diesel generator often gives early warning signals through sound before a serious failure occurs. Experienced technicians can often identify problem areas simply by listening to abnormal noises. Based on years of field service and troubleshooting experience, this article explains how to judge common diesel generator faults by sound, helping operators take timely action and avoid major damage.     1. Sharp Metallic Knocking: Piston or Connecting Rod Issues Sound Characteristics Clear, sharp “ticking” or “knocking” sound Noise becomes louder as engine speed increases Possible Causes Worn piston pin Excessive clearance in connecting rod bearings Broken or severely worn piston rings Recommended Actions Inspect the lubrication system immediately Check piston assembly, connecting rod bearings, and piston rings Stop the generator if knocking intensifies to p...