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Input shaft bearing or releasing bearing

Old 02-May-2007, 10:34 PM
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Input shaft bearing or releasing bearing

Hi,

I've been having a problem with my car for over a year now and its driving me nuts. It's been narrowed down to either the release bearing or input shaft bearing.

I've read many threads with similar problems and everyone has said its the input shaft bearing. Now, I went to a mechanic who is an affiliate on TCC and he said the Input Shaft Bearing and release bearing are pretty much the same thing??????

Here is my problem:

When I accelerate I hear this loud churning type noise, like a chatter. Its loudest in first and second gear. In neutral the noise is there but a constant lower level noise, not as loud, but its constant. When I press the clutch in all the way, the noise goes away and its totally silent. But again when I let my foot off the clutch the noise comes back. Its very loud on acceleration and when letting go of the throttle and letting the car just deccelerate, you can hear it too.

I changed my clutch with an OEM Exedy clutch kit with release bearing about 20,000km ago. Then noise went away literally for about 500km, then came right back.

I'm totally stumped because the mechanic I went to today(tcc affiliate) took it for a short spin and he said 100% its the release bearing and not the tranny. He showed me where the release bearing goes in the tranny.....with the tranny open, it goes on the shaft that sticks out. (But isn't that the input shaft bearing??????? )

Someone please help I need to get this fixed, and I dont want to replace the clutch again, and then it ends up being the tranny, or vise versa.....

Hope some replies here can help me diagnose this better. Thanks again.
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Old 02-May-2007, 10:59 PM
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its your release bearing.

Which affiliate said the input shaft bearing and relase bearing are the same thing? I would recommend NEVER to take his advice again.. thats like saying 5w30 and 15w40 are the samething.

They do different things and are completely different jobs to repair.

Change your throwout bearing.
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Old 03-May-2007, 04:39 PM
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I have the exact same thing.

I had read that it was the input shaft bearing as I had just changed my clutch prior to the noise developing.
Yeah, the noise is really annoying.
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Old 03-May-2007, 08:03 PM
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Originally posted by SLOGAN
I have the exact same thing.

I had read that it was the input shaft bearing as I had just changed my clutch prior to the noise developing.
Yeah, the noise is really annoying.
Yeah it is really annoying, but more importantly I think it has an affect on the power too, did you find that your shifting is off and the car seems to be lacking power???
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Old 04-May-2007, 07:32 PM
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Anybody else have any idea???
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Old 04-May-2007, 07:33 PM
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Originally posted by chris_v2
its your release bearing.

Which affiliate said the input shaft bearing and relase bearing are the same thing? I would recommend NEVER to take his advice again.. thats like saying 5w30 and 15w40 are the samething.

They do different things and are completely different jobs to repair.

Change your throwout bearing.

That would be Break The Needle. And in fact I looked at the affiliates page, and they dont seem to be an affiliate anymore
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Old 04-May-2007, 11:22 PM
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Originally posted by 2drcivic
Anybody else have any idea???
i just told you?
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Old 05-May-2007, 12:10 AM
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Might be wrong but i think you would hear the release bearing if you pressed the clutch in since the release bearing is now touching the pressure plate to disengage the clutch disc. The outer race would be stationary sitting on the release fork and the inner race would be turned by the pressure plate which would cause the bearing to make a noise if it was damaged. but you say that it goes silent when you press the clutch in which would mean that the release bearing should be operating fine.

Could be the input shaft bearing though if you hear it when you accelerate, and in neutral with clutch engaged. or it could be the mainshaft bearing since you only hear it in 1st and 2nd gear (the mainshaft is turning slower than the input shaft in these gears which would cause the mainshaft bearing to move and make noise).

Do you hear the noise in 4th or 5th? If you do i'd look into fixing the mainshaft bearing. If its the mainshaft bearing you wouldn't hear a noise in direct drive...(3rd gear would be the closest to the 1:1 direct drive ratio).

just my thoughts.
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Old 05-May-2007, 02:42 AM
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Originally posted by CleanJDM89
Might be wrong but i think you would hear the release bearing if you pressed the clutch in since the release bearing is now touching the pressure plate to disengage the clutch disc. The outer race would be stationary sitting on the release fork and the inner race would be turned by the pressure plate which would cause the bearing to make a noise if it was damaged. but you say that it goes silent when you press the clutch in which would mean that the release bearing should be operating fine.

Could be the input shaft bearing though if you hear it when you accelerate, and in neutral with clutch engaged. or it could be the mainshaft bearing since you only hear it in 1st and 2nd gear (the mainshaft is turning slower than the input shaft in these gears which would cause the mainshaft bearing to move and make noise).

Do you hear the noise in 4th or 5th? If you do i'd look into fixing the mainshaft bearing. If its the mainshaft bearing you wouldn't hear a noise in direct drive...(3rd gear would be the closest to the 1:1 direct drive ratio).

just my thoughts.
From reading a number of articles on the net, thats what most articles say, that if you press the clutch pedal in and hear a noise then it is your release bearing, where as if you press the clutch pedal in and the noise goes away its probably your input shaft bearing.
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Old 05-May-2007, 02:44 AM
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Originally posted by chris_v2


i just told you?
I appreciate your input, and you are probably right but at the same time I'm looking for as many opinions as possible. The next post CleanJDM89 suggests that it may be the input shaft. This is how I'm going to come to a conclusion by getting as much feedback as possible.
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Old 08-May-2007, 02:44 PM
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i have the exact same problem, my boss said to get a clutch kit, so we changed the clutch, pressure plate, and release bearing. its still making the noise. so i took it to a tranny shop today, and he says i got to rebuild the tranny, the bearing is making noise.

so if anyone has a b16a2 full swap, low clicks for under $2000.. let me know.
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Old 08-May-2007, 06:54 PM
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Originally posted by 2drcivic


I appreciate your input, and you are probably right but at the same time I'm looking for as many opinions as possible. The next post CleanJDM89 suggests that it may be the input shaft. This is how I'm going to come to a conclusion by getting as much feedback as possible.
Whatever dude..

If you push the clutch in and the noise goes away its the release bearing. Input shaft bearings sound more like someone ice skating on your tranny at all times (clutch in/out whatever). Technically a release bearing will make noise when the pedal is depressed.. but I can honestly say out of the 15-20 bad throw out bearings that i've heard.. it was when the clutch wasnt depressed (or up), I havent fully understanded why it does this, my theory was that when the bearings are compressed it will hide the problem, but when they are free they will create a grinding sound..

Either way, you have to pull your transmission. Pull it out and check the throw out bearing, my money says its toast.
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Old 09-May-2007, 08:17 PM
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There seems to be a lot of misinformation here.

The noise you describe is coming from the input shaft bearing, and it is the one closest to the clutch INSIDE the tranny, right beside first gear. This is usually the first bearing to go in the tranny because you probably shift agressively or launch the car hard.

The "mechanic" friend who said the input shaft bearing and the throwout bearing are kinda the same thing should not be a "mechanic" or stick to doing oil changes at Midas.

To replace the input shaft bearing you have to pull the tranny and open it up, so have a new clutch (pressure plate/friction disk/throw out bearing) on hand because you will want to check them with the tranny out.
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Old 10-May-2007, 07:56 AM
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i have the exact same problem on my d16 its quite though when it gets a bit worse im gonna just change the tranny

mayb in the end it would be cheaper for you to do the same thing
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Old 11-May-2007, 12:19 AM
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If I hold of on doing this repair, could it affect the performance of the car?
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Old 12-May-2007, 10:59 PM
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Originally posted by Whiplash
if the input bearing lets go you're gonna be into more than just a bearing..
prob a whole tranny in the end..
possibly a clutch/flywheel as well cuz things are gonna start to walk
that, and the cost of a tow

baby it and you might get by for a while....
keep "performing" and it could come at any time
"Keep performing"............haha I like that. Man, I'm pretty much stock, so I dont even bother, but yeah I've had this for the last year, and it hasn't really gotten worse or anything...in fact it still goes away once in a while, but always seems to reappear. But Yeah the last thing I want is for it to go while I'm driving..........anybody know someone who has done this repair themselves and who can do it for me for cheap?
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Old 12-May-2007, 11:45 PM
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Originally posted by chris_v2


Whatever dude..

If you push the clutch in and the noise goes away its the release bearing. Input shaft bearings sound more like someone ice skating on your tranny at all times (clutch in/out whatever). Technically a release bearing will make noise when the pedal is depressed.. but I can honestly say out of the 15-20 bad throw out bearings that i've heard.. it was when the clutch wasnt depressed (or up), I havent fully understanded why it does this, my theory was that when the bearings are compressed it will hide the problem, but when they are free they will create a grinding sound..

Either way, you have to pull your transmission. Pull it out and check the throw out bearing, my money says its toast.

Please tell me your not a Mechanic... Release Bearing noise occurs when the clutch pedal is pressed (clutch disengaged) because clutch pedal takes up the free play and is now touching the pressure plate fingers. And if the release bearing is screwed thats were u get noises, other wise it should be silent. and It is the input shaft bearing OR the mainshaft bearing, if hes hearing it in first and second and possibly in all gears. except for 4th gear because that should be direct drive (for those who dont know gear ratio is 1:1). So Chris_v2 I don't know who your mechanic so who knows if your getting the right information.
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Old 13-May-2007, 12:03 AM
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edit: nvm. Who cares.
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