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My car's throw out bearing is faulty and sometimes there's knock noise coming out from my clutch. I was wondering, could it affect input shaft of transmission?

  • Throwout bearings fail when people press the clutch continuously (or it's very misadjusted). So if you park your left foot there at cruise, or hold it in during traffic and red lights, time to change that. Otherwise it's an adjustment issue, – Harper - Reinstate Monica Sep 11 at 21:08
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It's very unlikely that a failing throwout bearing will damage the transmission input shaft. What's more likely is that the clutch fork, the part that moves the bearing itself, could be damaged.

I recommend getting this fixed (or fixing it yourself) as soon as possible as it can fail totally without warning and at the LEAST convenient time.

The knocking noise is almost certainly the bearing itself. By the way, it's usually a good idea to replace at least the clutch plate and possibly the pressure plate and the flywheel at the same time. Most of the expense is getting the transmission out and all those parts will probably be worn too.

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