Hello:wavey I have a 93 5.0 mustang when its running my tranny makes a cherping noise but as soon as I push the clutch pedal down the cherping STOPS!! I figured it was the throwout bearing so I checkedout the forums to see what I could findout before I start takin her apart and have heard that it could be the pilot bearing so Im getting kinda confused because alot of people say it could be one or the other by when it makes noise mine only makes noise when the clutch isnt pressed when I push the pedal down it stops I just dont want to do all that work to replace the wrong thing and it still cherp its driving me CRAZY I also have a aftermarket heavy duty clutch and pressure plate that work great but want to make sure I get a good throwout bearing that will hold up instead of a stock one any suggestions ? PLEASE HELP!!!
That sounds like a bad pilot. When the car is running down the road, the pilot is turning the same speed as the crank. When you push the clutch in, the input shaft stops spinning, thus, the inner half of the pilot is not turning while the outer half is along with the crank. The outer case of the pilot is still turning while the needle roller bearings(inside part of the bearing), is not. This is a bad pilot.
A bad throw out bearing will make noise when you push the clutch down. When the clutch is adjusted properly, you should have a 1/4" gap between the face of the bearing and the fingers on the pressure plate. This means the bearing is not turning. When you push the pedal down, the bearing comes in contact with the pressure plate and is now turning and making noise.
Tremec TKO Transmission Systems