New Throw out bearing not good?

I just finished a t90 d18 rebuild on my 48 cj2a with mostly nos usa made parts. and bought the clutch "kit" at oreilly that came with a clutch, a alignment clutch tool, a pilot bushing, and a throw out bearing.

First drive was today and when the clutch is pushed in there is a fairly quiet whirring noise that only happens with clutch pushed. I only hear it idling in the driveway probably because road noises cover it while driving.

I'm only assuming it's the throw out bearing based on the symptoms. But is it fairly common for a new throw out bearing to be noisy when new?

No noise before. This is a whole new clutch kit bought at local parts store Oreilly Auto parts and it came with everything. And I had a local machine shop resurface the flywheel and I installed a new ring gear

It's tough to diagnose things over the internet and sometimes it's tough, even hearing it person to make an exact call but a throw out bearing noise is usually easy to figure out if it comes and goes with your use of the clutch pedal.

Oilleaker1 wrote: They don't lube the new ones enough. I finger pack more grease in mine. It helps with the whirring noise. Oilly

My kit which I bought from Auto Zone, most likely the same as yours, did the exact same thing from the throw out bearing. Clutched it a few times and rev up the engine and the noise has not returned. Did notice a bit of grease around the bearing though. My thought is the grease needed to be distributed around the inner part of bearing. Hope your outcome is similar to mine.

My thought also maybe something other than the throw out bearing. I changed my throw out bearing a couple of times and still had the noise and found out it was the starter drive gear rattling against the flywheel when I pushed the clutch peddle in. The few thousands of a inch the crankshaft moved the flywheel toward the starter was just enough to cause it to rattle. Changed the starter Bendix and the noise went away.

    Jim