loud swooshing sound, clutch-related

[geecee]

Hi Y'all,

it's a continuing saga with my Bruna (1980 FI). The latest is a swooshing sound, quite loud like a lot of air coming out. It starts while driving and after she has had the time to warm up a bit. It seems to come from the passenger rear side, but I could be wrong there.
The key information is that it stops if I press the clutch, and starts right back and just as loud if I release it.

Any idea? Transmission related obviously, but I'm trying to figure out if this is going to break me and make me decide that she needs a new owner, or is it not time to give up yet?

Thanks a bunch!
Giulia

[ORFORD2004]

pilot bearing in the center of the flywheel

[RRoller123]

This may sound crazy, but when I switched from synthetic gear oil (Redline MT-90) to plain old GL-1 from NAPA, the entire gearbox system quieted down tremendously. Like you, I had some noises when engaging and disengaging the clutch, due to the bearing most likely.

[geecee]

I'm taking her back to her mechanic tomorrow, and I'll ask them to drain and flush the transmission fluid. Hopefully that will improve things.
It's not in the gear box as the shifting seems quite smooth, and she responds appropriately to it...we'll see.
I'm hoping for a minor issue, but when is it ever the case??
Giulia

[geecee]

Lucky for once....so far.
It turns out that it was a vibration issue related to the muffler. Basically the clamps holding the muffler, which by the way it's probably not the original one, are not holding it properly and while running it moves around. After a while it started rubbing against the passenger side rear wheel and making that weird sound. My guy "fixed" it with some improvised clamping system and....voila', the noise is gone free of charge.
Yeah well, for now it's gone. Until I can find time to take a look and work on a permanent solution.

Giulia

P.S. I had them empting and replacing the transmission oil. Just for good measure, and because it's just odd to leave a garage without paying for something.

[Nanonevol]

And you were considering selling her! I hope her feelings aren't hurt.