Bmw input shaft bearing noise When you release the clutch it should quiet down. com Jan 18, 2024 ยท So, if the noise stops when the clutch pedal is pressed in, it is most likely the throwout bearing, but could also be the transmission input shaft bearing. There is some sort of whirring/rumbling noise evident around 75 kmp to 90 kph which relates to road speed rather than engine speed. Thin/hot oil, less. And it does tend to sound suspiciously like a bad ISB since the noise is present only while the input shaft is spinning (foot OFF the clutch pedal/clutch engaged). A bad throwout bearing usually only makes noise when you disengage the clutch and is independent of whether the transmission is gear. This is the preload on the bearing. The pilot bearing, also known as the input shaft bearing, is situated at the center of the flywheel. When you engage the clutch (push it in) the gearbox internals stop spinning, hence the noisy bearing is not turning. When the bearing is bad, it can cause vibrations, noise, and difficulty in shifting gears, resulting in potential transmission failure.
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