- Pilot Bearing: The pilot bearing is a small bearing located at the end of the crankshaft that supports the input shaft of the transmission. If this bearing is worn or damaged, it can make noise when the transmission is engaged and/or put load on the engine from the driveline. When you put the clutch in, that bearing is unloaded allowing the squeal to stop.
- Throw-Out Bearing: The throwout bearing is a bearing that is used to disengage the clutch from the flywheel. If this bearing is worn or damaged, it can cause a whining or squealing noise when the clutch is engaged and/or put load on the engine from the driveline. When you disengage the clutch by pressing the clutch in it unloads the throw-out bearing and stops the noise.
- Input Shaft Bearing: The input shaft bearing is a bearing that supports the input shaft of the transmission. If the input shaft bearing is worn, damaged, or doesn’t have adequate grease it can make noise when the gears inside of the transmission are engaged and transmitting torque from the engine. As soon as the clutch is depressed the transmission input shaft stops spinning therefore removing the noise.
- Damaged Transmission Gear: If one or more of the transmission gears are worn, damaged, or chipped it could potentially make noise when the transmission is engaged. As soon as the clutch is depressed the transmission stops turning and so does the noise.
- Transmission Fluid: If the transmission fluid is low or dirty, it can cause the gears to make noise. Adding the proper amount and type of fluid or changing it may resolve the issue.
