I have a noise that definetly sounds like a bearing when the clutch is engaged (so not the throw-out bearing). The noise has been there for a while (about a year) and is getting progressivley worse; when I had the tranny apart about 6 months ago, all the internal bearings were perfect. Would this be the pilot bearing making the noise? It's quite loud and is clearly audible up to about 3000 RPMs (can't really hear it too well afterwards). This is the only other item I can think of that is related to having the clutch engaged/dis-engaged, but just want a confirmation before I go in there to replace it.

 

When the clutch is engaged the pilot bearing is NOT spinning. So I'd say its something else.

Or maybe - you know the clutch is engaged when the pedal is UP, right? You press the pedal down to DISengage the clutch.

Pilot bearing or throw-out bearing; either way you have to take off the tranny so you may as well replace them both along with the clutch & PP.

 

Definetly not the throw-out bearing, I replaced that back when I had the tranny off 6 months ago.

 

sounds like release bearing, even after you changed it.Does it sound like a helicopter?

 

No, just a loud whirring noise. I don't see how it could be a throw-out bearing when it's not even spinning while the clutch is engaged (=pedal up).

 

It spins anyway. I think there's just the smallest load on the bearing all the time. I had an '89 Saab whose T-O bearing was noisy when the clutch was engaged. It was kind of a whirring noise. When you pressed the pedal to disengage the clutch, the T-O bearing was loaded, which made it quiet down. I realize that's backwards from how they USUALLY fail, but it's an example that they don't all have to fail exactly the same way.

But here's another check... Engine running, transmission in neutral, clutch engaged, it should be making the noise. Press down the clutch pedal quickly. A noisy T-O bearing will get quiet instantly. A noisy transmission input shaft bearing will take a couple of seconds to coast to a stop. Or sometimes (if the clutch drags just a little) it won't stop until you shift into gear.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JimBlake &raquo;</TD></TR><TR><TD CLASS="quote">When you pressed the pedal to disengage the clutch, the T-O bearing was loaded, which made it quiet down. I realize that's backwards from how they USUALLY fail, but it's an example that they don't all have to fail exactly the same way.
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You sure about that, the throw out bearing will make noise when you step on the pedal, the throw out bearing does nothing when the pedal is up so how is it gonna make noise ? It just sits there. When the pedal is up and the trans is in neutral the inner race and outer race of the pilot bearing are moving together therefore causing no noise, only when you press the clutch pedal down will the outer race spin faster then the inner, causing noise from the pilot bearing.


Modified by 90blackcrx at 5:00 PM 12/8/2003

 

When the clutch pedal is UP, the flywheel & the trans input shaft are spinning together, so the pilot bearing is not spinning. Well, it's spinning together, but inner & outer parts aren't moving against each other, so you say is isn't spinning. Get it? Doesn't matter whether the transmission is in gear or not.

Throw-out bearing is different - I think it spins all the time. When the pedal is up (clutch engaged) there's very little load on the throw-out bearing. It's just kinda resting against the pressure plate. I don't think there's anything actually pulling it firmly AWAY from the PP. So it spins. But without any pressure, a loose T-O bearing can rattle. When you press the pedal down to disengage the clutch, the T-O bearing presses hard against the pressure plate. This pressure sometimes makes it louder, but sometimes it makes a loose bearing quieter. They don't always have to fail the same way.

 

what about when a clutch squeeks when u press it and it dont feel stock no more almost feels like a lil squish or crunch when u press it?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JimBlake &raquo;</TD></TR><TR><TD CLASS="quote">When the clutch pedal is UP, the flywheel & the trans input shaft are spinning together, so the pilot bearing is not spinning. Well, it's spinning together, but inner & outer parts aren't moving against each other, so you say is isn't spinning. Get it? Doesn't matter whether the transmission is in gear or not.
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Yes, that is true, I got a little confused trying to remember. I don't think the other part about the throw out bearing being on the clutch disc all the time is true.

 

So even though the noise is only with the clutch engaged (pedal up), I'm still looking at the throw-out bearing? If that's what it is I'm not going to spend the time tearing the tranny off again, as the noise did not change AT ALL when replacing the TO bearing a few months ago (brand new Honda bearing and spring).

So should I look to anything else for the noise (clutch and/or pressure plate), or just accept that my car has a noisy TO bearing?

Addition: I never stated, but this is a 1990 CRX DX (D15B2, DX tranny, Honda clutch/PP replaced ~10,000 miles ago).

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Aron Parsons &raquo;</TD></TR><TR><TD CLASS="quote">So even though the noise is only with the clutch engaged (pedal up), I'm still looking at the throw-out bearing?</TD></TR></TABLE>

If you ask me, I am gonna tell you no. The throw out bearing touches nothing when the pedal is up. Therefore it does not make any noise when the pedal is up.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Aron Parson &raquo;</TD></TR><TR><TD CLASS="quote">So should I look to anything else for the noise (clutch and/or pressure plate), or just accept that my car has a noisy TO bearing?</TD></TR></TABLE>

Look into a pilot bearing or a input shaft bearing.

 

Guess I"ll be doing the pilot bearing over the Christmas break. When the noise was just becoming loud enough to bother me a few months back, the transmission technician who checked out my internals said everything was fine. All the bearings looked and sounded good to me as well before we re-assembled the tranny. I guess for $13 in parts, I can spare a day or two to replace the bearing. Thanks for the input guys, hope this cures it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JimBlake &raquo;</TD></TR><TR><TD CLASS="quote">But here's another check... Engine running, transmission in neutral, clutch engaged, it should be making the noise. Press down the clutch pedal quickly. A noisy T-O bearing will get quiet instantly. A noisy transmission input shaft bearing will take a couple of seconds to coast to a stop. Or sometimes (if the clutch drags just a little) it won't stop until you shift into gear.
</TD></TR></TABLE> Did you try this check??

I guess I'm not really sure whether Honda T-O bearings rest lightly on the PP all the time. But they do in '89 Saab, '86 VW, and '72 Datsun, the only ones I've taken apart. But in a Honda, I'll believe you when you show me WHAT PULLS IT AWAY?

If there's a spring pulling it away from the PP, then you'd have a large dead pedal travel before you hit the spring. With a spring pulling it away, how would it adjust as the clutch wears? That's all done with valving in the master cylinder which allows the slave to retract further & further as the PP pushes on it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by igotyofire &raquo;</TD></TR><TR><TD CLASS="quote">what about when a clutch squeeks when u press it and it dont feel stock no more almost feels like a lil squish or crunch when u press it?</TD></TR></TABLE>Maybe the pivot points of the throw-out fork are dried out & need some grease? One point is the ball & socket where the slave piston pushes against the T-O fork. Another is just inside the bellhousing where the fork pivots.

 

The noise goes away instantly when the clutch is dis-engaged.

I can't imagine anything needing grease in the area, as it was all greased up well when I reinstalled the tranny last time. And it sounds as if you're talking about a hydroulic (sp?) tranny, my 90 CRX is using a cable tranny.

 

The bit about greasing the throw-out fork was for igotyofire's question... But a cable tranny still has a throw-out fork. The cable pulls on it instead of the slave cylinder pushing.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Aron Parsons &raquo;</TD></TR><TR><TD CLASS="quote">The noise goes away instantly when the clutch is dis-engaged.
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Defiantly sounds like the input shaft bearing.

 

I'm having the same issue. Did you find out that it was the Input Shaft bearing? I replaced my throwout bearing with no luck of fixing the noise.

 

Hey, just letting you know, I have the EXACT same problem on my B18C tranny. Pedal engaged=loud cycling sound; pedal DISengaged=NO sound at all!!!
I just bought the pilot bearing thinking that would solve it, but after reading this, I might as well buy the imput shaft bearing. I will be working on this hopefully this coming sunday (the 26th of Feb, 06) and I will also put a new cluctch and pp, and a new lightweight flywheel. Hopefully that bearing will remove the noise. I still have the mechanical (clutch type a.k.a Kaaz) lsd noise at low gear/rpm, but that one I know what it is, and I know it's normal!!

I'll update on what happens!!
Laterz!

-JMo

 

where do you guys purchase the bearing. I looked on kragen and autozone and they did not have them listed. what is the usual price of a throwour bearing, pilot bearing and input shaft bearing cuz i'mma replace them all to get rid of the noise

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by !vega_boxes! &raquo;</TD></TR><TR><TD CLASS="quote">where do you guys purchase the bearing. I looked on kragen and autozone and they did not have them listed. what is the usual price of a throwour bearing, pilot bearing and input shaft bearing cuz i'mma replace them all to get rid of the noise</TD></TR></TABLE>

james, dont go cheap when replacing important parts that are hard to get to...

go to your local acura and get those bearings, they should have them in stock....