What Causes Abnormal Noises in a Car Engine?
2 Answers
When abnormal noises occur in a car engine, the first step is to identify the source of the noise and then diagnose the specific issue in that area. There are numerous potential sources of abnormal noises in a car engine, such as belt squealing, valve noise, or piston knocking. The engine consists of many components, each playing a crucial role. Most abnormal engine noises originate from these parts, including water pump noise, air conditioning compressor noise, alternator noise, and belt assembly noise. These are among the most common abnormal noises encountered in daily vehicle use. If you experience any of these issues, you can use basic knowledge to make a preliminary assessment. Of course, if the problem persists, it is advisable to seek professional inspection at a qualified auto repair facility. Belt noise is the easiest to diagnose. If you hear a squealing sound after starting the engine, it is likely due to belt slippage. The solution is straightforward: simply replace the belt. Belts are wear-and-tear items and should be replaced every 60,000 to 80,000 kilometers. Valve noise occurs in the upper part of the engine, beneath the valve cover. There are several reasons for valve noise, including abnormal wear or inadequate lubrication.
As an experienced mechanic, I've seen many cases of abnormal engine noises. The most common is piston wear causing knocking sounds, which resemble metal collisions, especially noticeable during cold starts or acceleration. This usually requires replacing piston rings or pistons, otherwise it can lead to more severe damage. Excessive valve lifter clearance produces a ticking sound, which can be diagnosed by checking engine oil and oil pressure. A failing water pump bearing creates a squealing noise that affects the cooling system. Additionally, a loose timing chain makes a grinding noise that worsens during acceleration. I recommend drivers visit professional shops immediately upon hearing abnormal sounds - don't delay to save money. Preventive measures include regular oil changes and belt inspections. Safety comes first, as strange noises can escalate to breakdown risks. I've handled too many major repair bills caused by minor neglect. Remember, from slight ticks to severe knocking, prompt action is always needed.
