What are the signs of a pilot bearing going out?
05-22-2010, 09:08 AM
#2
TECH Senior Member
iTrader: (96)
Join Date: Aug 2007
Location: Turnin' Wrenches Infractions: 005
Posts: 24,240
Likes: 0
Received 79 Likes
on
70 Posts
grinding noises for sure, especially when sitting at idle. I saw a pilot bearing one time where the rollers came loose and literally chewed themselves into dust fighting with the input shaft of the tranny.
05-22-2010, 11:54 AM
#3
pilot bearing usually will make noise when the clutch is engaged because that is the only time its actually doing anything
otherwise the input shaft is mated with the crankshaft via the clutch and the pilot bearing does nothing
i once had a pilot bearing problem, usually it would make a grinding/squealing noise a few seconds after the clutch was engaged and would last for 10 sec or less it also gave mad vibrations threw the tranny to my shifter
otherwise the input shaft is mated with the crankshaft via the clutch and the pilot bearing does nothing
i once had a pilot bearing problem, usually it would make a grinding/squealing noise a few seconds after the clutch was engaged and would last for 10 sec or less it also gave mad vibrations threw the tranny to my shifter
05-22-2010, 01:32 PM
#4
pilot bearing usually will make noise when the clutch is engaged because that is the only time its actually doing anything
otherwise the input shaft is mated with the crankshaft via the clutch and the pilot bearing does nothing
i once had a pilot bearing problem, usually it would make a grinding/squealing noise a few seconds after the clutch was engaged and would last for 10 sec or less it also gave mad vibrations threw the tranny to my shifter
otherwise the input shaft is mated with the crankshaft via the clutch and the pilot bearing does nothing
i once had a pilot bearing problem, usually it would make a grinding/squealing noise a few seconds after the clutch was engaged and would last for 10 sec or less it also gave mad vibrations threw the tranny to my shifter
05-22-2010, 01:40 PM
#5
pilot bearing usually will make noise when the clutch is engaged because that is the only time its actually doing anything
otherwise the input shaft is mated with the crankshaft via the clutch and the pilot bearing does nothing
i once had a pilot bearing problem, usually it would make a grinding/squealing noise a few seconds after the clutch was engaged and would last for 10 sec or less it also gave mad vibrations threw the tranny to my shifter
otherwise the input shaft is mated with the crankshaft via the clutch and the pilot bearing does nothing
i once had a pilot bearing problem, usually it would make a grinding/squealing noise a few seconds after the clutch was engaged and would last for 10 sec or less it also gave mad vibrations threw the tranny to my shifter
05-22-2010, 02:02 PM
#6
when i said engage i really meant the clutch relives pressure from the disk allowing the crankshaft and input shaft to spin a different speeds
so that would be disengaging correct?
and no i was not talking about the throwout bearing
Trending Topics
05-22-2010, 07:28 PM
#8
My failing pilot bearing made a little rattle that only showed up at a low rpm... almost like a resonating exhaust rattling a loose bolt or clamp. You could hold it at the rpm, like 2400, and it would make that rattle constantly. It went away everywhere else though.
When I took my trans off to change out my clutch I was shocked at all the black dust everywhere. I thought for sure that my 135k mile clutch was going to be smoked, but it wasn't. It still had life on it, believe it or not. The trail of black dust led right up to the pilot bearing... or what was left of it. The outside (race) was still there, but most of the middle portion, and all of the roller bearings had turned to dust. The input shaft looked like a beaver had been gnawing on it. $1280 later I had a rebuilt transmission
It didn't make any vibrations or any excess noise, just a tiny rattle.
...stupid pilot bearing
When I took my trans off to change out my clutch I was shocked at all the black dust everywhere. I thought for sure that my 135k mile clutch was going to be smoked, but it wasn't. It still had life on it, believe it or not. The trail of black dust led right up to the pilot bearing... or what was left of it. The outside (race) was still there, but most of the middle portion, and all of the roller bearings had turned to dust. The input shaft looked like a beaver had been gnawing on it. $1280 later I had a rebuilt transmission
It didn't make any vibrations or any excess noise, just a tiny rattle.
...stupid pilot bearing
05-22-2010, 09:53 PM
#9
yea i had disengage and engage backwards
when i said engage i really meant the clutch relives pressure from the disk allowing the crankshaft and input shaft to spin a different speeds
so that would be disengaging correct?
and no i was not talking about the throwout bearing
when i said engage i really meant the clutch relives pressure from the disk allowing the crankshaft and input shaft to spin a different speeds
so that would be disengaging correct?
and no i was not talking about the throwout bearing
when the clutch is engaged, your foot is off the pedal, when it is disengaged your foot is pressing the pedal down
when you are pulling out from a stop sign, and lifting your foot up, you are engaging the clutch, while you are coming to a stop sign and pressing the clutch down you are disengaging it.
05-23-2010, 01:54 AM
#11
On The Tree
My LT1 T-56 makes a rattling noise much like that video posted when slowly accelerating in first gear at a low RPM. Mine is more rattly than squealing though. If I slip the clutch a little as I accelerate, it doesn't do it (not that I do that regularly). Doesn't seem to be happen in any other gear, or at higher than 1300 RPM or so.
I also have rattling noise coming from the transmission when sitting in neutral, clutch disengaged. (only audible with windows up, stereo off). Push clutch pedal in, noise goes away.
What does this indicate?
I also have rattling noise coming from the transmission when sitting in neutral, clutch disengaged. (only audible with windows up, stereo off). Push clutch pedal in, noise goes away.
What does this indicate?
05-23-2010, 07:27 AM
#12
I could be wrong though. Either way, it shouldn't be the pilot bearing.
05-23-2010, 07:31 AM
#13
My LT1 T-56 makes a rattling noise much like that video posted when slowly accelerating in first gear at a low RPM. Mine is more rattly than squealing though. If I slip the clutch a little as I accelerate, it doesn't do it (not that I do that regularly). Doesn't seem to be happen in any other gear, or at higher than 1300 RPM or so.
I also have rattling noise coming from the transmission when sitting in neutral, clutch disengaged. (only audible with windows up, stereo off). Push clutch pedal in, noise goes away.
What does this indicate?
I also have rattling noise coming from the transmission when sitting in neutral, clutch disengaged. (only audible with windows up, stereo off). Push clutch pedal in, noise goes away.
What does this indicate?
I've heard that low gringind/rattling noise come from every T56 fbody I've ever owned or ridden in. You're talking about the noise it makes when it's under a load at a really low RPM right? Mine doesn't do it on take off much any more, but it does it if I'm in the "wrong" gear, as in I need to down shift.
Now your rattle in neutral that goes away could be the throwout bearing... If you're sporting some mileage on a stock setup then I'd say that's all it is. You'll know when it's going out though...
05-23-2010, 01:55 PM
#14
On The Tree
I've heard that low gringind/rattling noise come from every T56 fbody I've ever owned or ridden in. You're talking about the noise it makes when it's under a load at a really low RPM right? Mine doesn't do it on take off much any more, but it does it if I'm in the "wrong" gear, as in I need to down shift.
Now your rattle in neutral that goes away could be the throwout bearing... If you're sporting some mileage on a stock setup then I'd say that's all it is. You'll know when it's going out though...
Now your rattle in neutral that goes away could be the throwout bearing... If you're sporting some mileage on a stock setup then I'd say that's all it is. You'll know when it's going out though...
On the other hand, what other symptoms will come up when the throwout bearing is close to death? Am I ruining anything in the transmission by not addressing it?
Thanks for your reply.
05-23-2010, 10:54 PM
#17
I've done some harsh launches... it seems to go away, not completely, but some, for about a half day. Then as I go back to regular, non-aggressive driving, the noise is back by the end of the day. It's even more prominent on a cold day/start-up...
05-23-2010, 11:50 PM
#19
I'll probably go LS7 next time... Was gonna go Monster Stg.3 but was told it would probably do the same thing.
It's just hard for me to get over the fact that these clutches normally do this. I just can't fatham someone making a product that sqeals this loud!
Everytime it does it, I cringe and think to myself "that's not right, something is definately wrong". However, the car seems to grab and hold the power fine. It feels a little funky on the peddle when feathering it into gear while giving it A LOT of throttle, like some sort of "rubbing" is the best I can describe it. But that could be no more than the clutch engaging while feathering at high rpm...
So I dunno... I give up... till something breaks I guess
/
05-24-2010, 12:36 AM
#20
made by clutch net?
did you resurface the FW and confirm it is not warped?