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Funny this thread should be at the top today, as I came here to ask a related question:
Has anyone here experienced a failure of the input shaft bearing? I'm by no means an expert on transmission issues, or parts in general, but over the past month or two I started noticing a distinct whine while accelerating in gear, that appeared to be tied to engine RPMs. At first I thought maybe I was imagining things, or that - this being a light-weight sports car with minimal sound deadening - I was just hearing standard transmission whine and it was normal for this car. 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. It as if I can hear exactly what the input shaft is doing. I hear it in neutral, and I hear it in every gear. The whine is even loud enough that I can hear the input shaft drastically slow down when I move the shifter from 1st to 2nd while driving, for example. I looked up input shaft noise videos on YouTube, but they all have HORRIBLE mechanical sounds as if the transmission has grenaded. Mine is just a very smooth whine that is present, but not particularly loud. Only loud enough to be heard. It also comes and goes, though it is mostly always audible, but it isn't particularly alarming. I bet almost nobody who wasn't a car person would even have noticed the sound yet. Is this a common issue? I've seen some posts on other forums for other vehicles where entire transmissions were replaced when this part went bad. Is it a complex job to repair? I can't seem to find ANYONE with this issue on the FT86 forums. Only throw-out bearing issues. I'm running AMSOIL in the transmission, by the way, and have been for about 6 months now. |
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It usually goes bad if something else went haywire in the transmission first. Yes, it's a bugger to replace; it seems that when they build a MT, they start with that bearing and build the rest of the transmission around it .....;) Unless it's totally shot, about the only way to tell if it's bad, is to totally dissemble the transmission. humfrz |
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Since my car is about 15,000 miles and your car is with 22,000 miles ...... I suggest the following. You drop your transmission and completely dissemble it. Buy a new transmission and dissemble it. Compare the two part by part, by visual inspection and measurements. (take lots of pictures) Take all the worn parts from the old transmission and stick them into the case of the new transmission. Return the "new" transmission to the dealer and tell them it didn't fit ..... you didn't realize you had an auto. Your observations will be of great service to this forum ........ and I will know when to expect to trade my car in. What do you think, gang ??....... :thumbsup: humfrz |
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I also hear a very faint whine, but very faint. My exhaust is loud so that makes it harder to hear haha. However, I'm at 54k miles and my throwout bearing is loud as f**k. Took it to the dealer last month and of course I couldn't replicate it to them :| But it squeaks everytime I step on the clutch lol.
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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. |
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