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Re: decoding manual trans noises Posted by Larry West [Email] (#1140) [Profile/Gallery] (more from Larry West) on Wed, 22 Feb 2012 07:29:19 In Reply to: decoding manual trans noises, thresholdmusic, Tue, 21 Feb 2012 09:52:39 Members do not see ads below this line. - Help Keep This Site Online - Signup |
It's probably the throw-out (TO) bearing, and it's a pretty normal noise. If your 99 has the original style slave, there's really nothing holding the TO bearing to the pressure plate when your foot is off the clutch, so it wobbles a bit, and isn't always spinning at exactly the same rate as the pressure plate.
Later slaves used a variety of methods to help "cure" this noise, the most recent of which involved a rubber bellows with a spring and a plate that kept the TO bearing solidly against the fingers of the pressure plate, all but eliminating the noise.
In my book, if the noise goes away when you push on the clutch pedal, it's fine, and will last a long time, still.
As for replacing the TO bearing, it's basically the same labor to replace any one piece of the clutch as it is to replace them all, so I have always replaced all the bits anytime I'm in there: Pressure plate, disc, slave, TO bearing, pilot bearing, and usually have the flywheel resurfaced (assuming I can find a shop that knows what FLAT is...).
Saab used to make this really easy by selling you a clutch "kit" with all those bits in a single box. Too bad that they haven't done that for a while...
BTW, there is only one oil supply for all the transmission bits: the main case, the differential, and the chain drive. You might want to check the oil level, and top up with NON synthetic 10W30 or 10W40 if needed
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