Chatter at low rpm when cold
 

For over a year I have been having this low rpm chatter coming from the front of the gearbox.
After I start the car in the morning and the rpm goes down to 700, I can hear a rattle/chatter in the gearbox. When I press the clutch the noise goes away but as soon as I take my foot off the clutch the noise is there.
Initially I thought that the clutch or throw out bearing is on its way out, but I had the clutch changed by a professional and it seems that the noise is even more obvious now.

Did you have the throw out bearing replaced along with the clutch ..... ??


humfrz

I have same issue if it even is one. Only when it's cold outside but goes away after warm. I'm sure it's just that.

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Throwout bearing. I can't remember which thread it was but this is common. What clutch did you put in (stock or aftermarket)? Also did you have the throwout bearing replaced when you got the work done?

Yes I did! Replaced with a brand new one...noise still there.

English please! :)

Aftermarket clutch, new throw out bearing ,etc.


Even if it s brand new, you still think is the TO bearing?

I blame the phone.

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Hey, ....... that's Missouri speak ....... I learnt that after living there for 7 years.

@Tonypepatone .......... jest ah messen wich ya .... ;)


humfrz

Broaden your search. I get that there have been loads of throw out bearing issues reported but it seems that it has become the go to recommendation and people are missing the small stuff by looking only for the big.
My guess (without being able to hear, see or feel things) is a loose heat shield or such that only vibrates when it is cold and shrunk up a little. As things warm up it expands just enough to not vibrate.


Like this:
http://www.ft86club.com/forums/showthread.php?t=97195

Do you trust they REALLY did replace the TOB .. ??

Maybe they put it in backwards ... ??

Maybe they replaced it with another old one, that looked OK....??

Pay me no never mind ..... :bonk:


humfrz

Conspiracy theories now Hum? Have you been taking your medication? Remember we talked about taking it on a regular basis.

DANG IT! ...... I just knew there was something I forgot to do today ...... :bonk:


humfrz

Not really, as I can tell is from inside the gearbox rather than out. Plus, a heatshield would not be influenced by the clutch pedal.


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The new clutch came with a new TOB. Also, they have put everything they have changed in a package to look at. The plate was on its way out.
All bearing and stuff been changed with brand spanking new ones.

hmmmm..........well, I hope it's not the transmission input shaft bearing ..... :(

That would require major surgery.


humfrz

It might actually be that I reckon

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I don't think pushing in the clutch would effect this though.

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Why wouldn't it .... ??

If you push the clutch in ..... the engine is disconnected from the transmission, thus the input shaft would quit turning, thus a bad bearing wouldn't make any noise.

Unless, I've got it backwards ...... :D


humfrz

I have this noise too. I thought it's normal. I got the throw-out bearing replaced for another reason, and that didn't get rid of this noise.

http://www.ft86club.com/forums/showthread.php?t=28296

Sounds like it is. Kinda...low revs, around 600 rpm? When cold?

Did you change your manual transmission fluid to motul?

Mine doesn't happen at 600. It's more like 650-700, so it only makes this noise when the A/C compressor is running. After everything is completely warmed up, the noise goes away.

Did change it few times already, same result

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Ah I see, I've been having the cold morning chatter as well. But this only occurred after I had changed the stock fluid to Motul.

Have you taken it to the dealer? Or have it checked by anyone?

Late to the party. There is always some backlash clatter in the gearbox at low rpm, especially for the light flywheel crowd.

I have heard a couple recordings of what sounds like an actual knock as the gearsets rotate in neutral. I don't know what that is but if it wasn't there before and is there now, something in the gearbox changed.

Can you post up a clip?

No, I thought this is a normal noise, so I haven't taken it to the dealer. I'm pretty sure it was making this noise since it was brand new. It just got louder after the transmission fluid was changed, but it happens to other people too. So, I'm thinking it's normal and something I don't need to worry about.

Ok, quick update.


I have taken it to the dealer, and they replaced the oil with Castrol VMX 80 which supposedly should be good for cold starts and such. To me it sounds like they are trying to mask the problem. I will give it another couple of days and see how it goes, and then call them back if the noise is still there.
Sounds like there is plenty of play in there!


Hmm!

I had this same issue with mine.

The dealer replaced the transmission and I never noticed it afterwards. Unfortunately, I can't say for sure if it fixed it because I no longer have the BRZ.

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I have the same problem but all stock.

Curious what the outcome is.

Update: had the transmission oil changed to VMX80 and it seems that the noise is not as obvious however I am afraid that the issue is being masked rather than resolved!


I will wait for another week or tow and see how this is going!

Noise is still there after a week's worth of driving! Damn it!

You change your flywheel? Never had an aftermarket flywheel that didn't sound like a cement truck.

Alot of guys have this noise for quite sometime now. So far nothing has failed yet just noise. When i do my clutch i will change the Input bearing too and maybe the input shaft aswell

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This sounds like flywheel rattle to me.