Quote:
Originally Posted by Stang70Fastback
However, this weekend I noticed it even more than normal. The noise is a very distinct whine. It goes away when I PUSH IN the clutch, and comes back when I release it, and I can definitely hear the whine "spin up" when I release the clutch..
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If you are rolling
in gear, the input shaft will be moving at the same speed, regardless of whether the clutch is in or out.
from neutral to in-gear, there will be a spin-up noise if you have bearing or synchro issues. The only time the input shaft will "spin up" is going from an extended roll in neutral to being in-gear, or rolling from a dead stop. Otherwise, it will always be spinning.
If there is a "spin up" noise from clutch-in to clutch-out regardless of whether you are in gear, I can explain that phenomenon based on a nearly seized throwout bearing, as it begins to spin in relation to the clutch fingers, dragging against them because the minimal preload is insufficient to keep a dying bearing spinning, but the preload is sufficient to create noise against the clutch fingers. That theory can be confirmed easily; pull the trans and look at the TOB.
Otherwise, gear whine under load is usually not bearing related. It is usually related to gear alignment. If you have worn out some of the tolerances in the transmission under hard driving, whining will start to emerge. It is not necessarily a bad thing, as it doesn't necessarily indicate harm being done, just an increase in gear lash, or decrease in bearing preload. Problems of helical gears. Internal bearings going bad in a transmission don't whine. They sound like a blender full of nails.