What does a balance shaft noise sound like?
2 Answers
Balance shaft noise mainly manifests in the following sounds: 1. Engine noise: There are many possibilities for abnormal noises coming from the engine compartment. Most people can identify engine compartment noises by the source of the sound, which is usually a metallic screeching or a whistling noise. 2. Transmission noise: Abnormal noises inside the transmission while driving, which disappear when the clutch or accelerator pedal is pressed. 3. Wear-related noise: Some minor noises from certain parts of the car body when pressing the accelerator or brake pedal. The noise is not loud and does not affect normal driving.
I've been into car modifications for a while now, and a balance shaft noise sounds like a continuous low humming, somewhat similar to the dull reverberation of an engine under heavy load, especially noticeable during acceleration or low-speed driving. The noise fluctuates with engine RPM, possibly slight at idle but becomes a constant hum when you step on the gas, as if there's metal parts rubbing or resonating deep within the engine. I think this kind of abnormal noise usually stems from bearing wear or vibration caused by the shaft itself being misaligned. If left untreated, the vibration can worsen, not only making driving uncomfortable but also potentially leading to more serious engine issues. I recommend getting it checked by a mechanic as soon as possible—it might just need bearing replacement or shaft realignment. This is a common issue with some older cars, and once fixed, the car runs much quieter and avoids safety hazards.
