What are the causes of abnormal noise in diesel engines?
2 Answers
Diesel engine fuel injection pump connecting steel plate is damaged. The following is a relevant introduction about diesel engines: 1. Concept: A diesel engine is an engine that burns diesel fuel to obtain energy release. The advantages of diesel engines are high power and good economic performance. The working process of a diesel engine has many similarities with that of a gasoline engine, with each working cycle also going through four strokes: intake, compression, power, and exhaust. 2. Development prospects: Being bulky, noisy, and emitting black smoke has given many people a poor first impression of diesel engines. After years of research and the application of new technologies, the current state of modern diesel engines is incomparable to the past. Modern diesel engines generally use technologies such as electronic control injection, common rail, and turbocharged intercooling, achieving significant breakthroughs in weight, noise, and smoke levels, reaching the standards of gasoline engines.
As someone who has driven diesel vehicles for over a decade, I've noticed that engine noises are quite common. The fuel injector is the first thing to consider—if it's clogged or worn, unstable oil pressure can cause a ticking sound, especially noticeable during cold starts. Improper valve clearance adjustment is another major cause; if not set correctly, it leads to a metallic knocking noise when the engine is cold, like a small hammer tapping. A loose belt tensioner can produce a squealing sound, often overlooked but quite noisy. Additionally, vibrations in the exhaust system can amplify noises if the mounting bolts are loose. More seriously, bearing issues—such as worn connecting rod or crankshaft bearings—result in a dull sound that becomes prominent during acceleration, often misdiagnosed. I recommend paying attention to noise changes during acceleration or cold starts and addressing issues promptly to prevent minor problems from escalating to engine replacement. After all, while diesel engines are reliable, unaddressed noises can compromise driving comfort and safety.
