.... SO there is a driveline guru on this site will tell you the same thing, TRUST ME he is the one that told me...
Thanks 1994MustangGT50..... and yes you are 100% correct on your assesment. :bigthumbsup
If you get a bearing noise that goes away when depressing the clutch pedal only, it is classic bad pilot bearing.
With the clutch adjusted properly, the throw out is not touching the fingers on the pressure plate UNTIL you depress the clutch pedal. That means with the pedal all the way out the rest position, the throw out bearing is just sitting there, not spinning, not doing anything, just sitting still. If it's not moving, how can it be sqealing? :scratchchin
General rule of thumb is you need between 1/8" and 1/4" gap between the face of the throw out bearing and the fingers of the pressure plate when the pedal is all the way put at the rest position. IT SHOULD NOT RIDE ON THE FINGERS 100% OF THE TIME.
If it does, you will experience premature bearing failure. The mechanical bearing is not designed to spin 100% of the time. Trust me (and 1994MustangGT50 :hihi
on this one. Not only my experience but I have first hand knowledge on this as well. My personal cars' stock cbale setup is almost worn out. I have hardly any adjustment left. About 4 months ago we put in one of our Proto-Type T45RS's into my car. I replaced the throw out bearing at that time. When I went to set the adjustment, I couldn't as the cable was worn out. I had to leave it with the throowout bearing riding the fingers all the time. Fast forward to last Friday.... we pulled my proto-type T45RS to install yet another proto-type version of the T45 I like to call the T45RS "S".
(read more about it in my thread I started earlier this week on here...) anyway, the new throwout bearing was squealing like a pig ALL THE TIME BECAUSE IT WAS CONSTANTLY TURNING WHEN THE ENGINE WAS RUNNING
. It only took a month or 2 before the squealing started as they are not designed to turn all the time. When we installed the T45RS "S", I changed the bearing again. Luckily I work here and have access to lifts and everything and we have changing out my tranny down to a science. We can do the job in less than 3 hours start to finish. I still haven't replaced my cable setup (lack of $$$) so I will be pulling this one out again in a few months. Lucky again, we have an endless supply of T/O bearings for me to use. :hihi:
The pilot bearing on the other hand is moving all the time that the engine is running. When you depress the clutch, the inner half of the bearing slows down as does the input shaft, when this happens, a noisy bearing will usually stop making noise.:bigthumbsup
I have seen bad ones out of the box as well. Also, if is was not greased when installed, or installed incorrectly it would squeal almost instantly.
Tremec TKO, T45 & T56 Transmission Systems