I just replaced my clutch assembly with all new parts about 7k miles ago. Now I am getting a whining noise when I depress the clutch. Research suggests that it is my TOB going bad. But. Why?
Why would a brand new TOB be going bad in less than 2 oil changes? I don't ever ever want to have to pull this transmission again, so I need to fix whatever problem caused this to happen.
Any thoughts?
They forgot to grease it at the factory, or the bearing races are made out of a hard gruyere cheese.
IIRC you were doing some engine swap jiggery-pokery, suggesting bits that didn't have a history of living together in peace before this assemblage?
Just wondering whether something in the slave cylinder/pushrod/fork arrangement is holding some pressure on the throwout bearing when you're off the clutch pedal. Worth checking even if it's just a matter of having assembled good parts with an issue (IIRC some BMW shift forks can sit a little funny if you're not careful; I'm rusty, and don't have a reference car handy).
I guess I should give a little car back ground.
88 bmw 325i
swapped with a m52b28 engine and zf320 trans both from a 97 328i e36
flywheel and clutch are from an e30 with a m20b25 engine.
both use the same throw out bearing but I had to use a longer slave rod to get the engagement point up off the floor.
engagement point is currently just a hair higher than the mid point of pedal travel with plenty of letoff after the clutch is engaged
FWIW, my 97 328is had a noisy throwout bearing for as long as I owned it, but never got any worse or gave me any other trouble.
Well mine isn't giving me trouble, just the noise. May be will drive on it a while
Furious_E said:FWIW, my 97 328is had a noisy throwout bearing for as long as I owned it, but never got any worse or gave me any other trouble.
how loud was it?
Subarus come this way from the factory. I've listened to my original and replacement TOBs whining for 160k miles now.
The TOB on my e30 (M42 with M20B25 flywheel/clutch and e21 323 TOB) also makes some noise when clutched in.
Slight misalignment of the engine output to trans input? It could be minor enough to not cause any problems other than accelerated TOB wear. Or could it be that something is pressing/pulling on it slightly when the clutch pedal is released? That would also accelerate TOB wear.
I should add that the slave cylinder rod is all steel instead having a plastic end.
and i put in a all metal clutch fork pivot pin in place of a plastic one.
could all that metal just be transferring more sound through the transmission case than the stock plastic stuff?
^Ah that could be it. Replacing all that plastic with steel would increase NVH. Although a plastic clutch fork pivot pin sounds like a great way to get experience in floating gears!
Daeldalus said:Furious_E said:FWIW, my 97 328is had a noisy throwout bearing for as long as I owned it, but never got any worse or gave me any other trouble.
how loud was it?
Noticeable, but not excessive. Like, you could clearly hear it above the engine idling or most other ambient noise, but it wasn't loud enough to immediately draw your attention if you weren't listening for it. If any of that makes sense...
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