Welcome to the SR20 Community Forum - The Dash.
Register
SR20 forum logo

Thread: Input Shaft Bearing

+ Reply To Thread
Posts: 21-29 of 29
2011-11-16 00:45:16
#21
Just curious, why did you switch gear oils Reese?
2011-11-16 01:15:39
#22
I thought this noise u guys are referring to was found out to be the clips that hold the throw out bearing a long time ago.
2011-11-16 01:19:41
#23
Originally Posted by nismonx2000
I thought this noise u guys are referring to was found out to be the clips that hold the throw out bearing a long time ago.


The problem here is that the same noise can be caused by so many things. You just never know until you get in there. It makes me laugh how often this topic keeps coming up.

Truth be told, an accurate diagnosis requires you to drop the trans and take a peek at everything, but nobody ever wants to do that. The result is this, multiple different answers that are all, in their own right, correct.
2011-11-16 01:58:26
#24
not really, you can accurately diagnose a bad throwout bearing vs a bad input shaft bearing or noisy gears/bearings inside the trans.

If you have slight noise from the trans usually sounding like a bad ball bearing you can lightly push the clutch pedal to put pressure on the throwout bearing without disengaging the clutch. If the noise goes away or gets worse, Throwout bearing. If the noise only goes away after you disengage the clutch then you have noise inside the trans. And usually you can do this test.

As your listening to the noise in the trans with the trans fluid fully warmed up, shifter in neutral, clutch engaged you can quickly press the clutch disengaging the clutch and you should hear the noise dissipate over a second or two, not instantaniously as the gears will still turn from the engine rpm and slow down.

The noise heard from a bad input shaft bearing or noisy gears is more of a low tone while throwout bearings are more high pitched and again sound like a worn skateboard bearing. Usually noise from the throwout bearing will go away with slight pressure or if they are really bad the noise pitch will increase.

Its pretty easy to diagnose if you know what you are looking for.
2011-11-16 02:21:11
#25
Originally Posted by blusteelsr20
Just curious, why did you switch gear oils Reese?


^I was at the local Advance when I picked up my fully synthetic valvoline sythetic motor oil and oil filter, so I picked up some valvoline gear oil while I was there.

Originally Posted by WingmanSR20
The problem here is that the same noise can be caused by so many things. You just never know until you get in there. It makes me laugh how often this topic keeps coming up.

Truth be told, an accurate diagnosis requires you to drop the trans and take a peek at everything, but nobody ever wants to do that. The result is this, multiple different answers that are all, in their own right, correct.


^This thread is 3 years old. I just bumped it as I was not sure if it was the throw out bearing.
2011-11-16 02:36:01
#26
Originally Posted by nismonx2000
I thought this noise u guys are referring to was found out to be the clips that hold the throw out bearing a long time ago.


How would the clips make noise when nothing is contacting the throw out bearing? Vibration? Or are you suggesting the TOB is slightly contacting the clutch while not engaged? Just wondering.





On a side note, I have been driving my car around all day and havent been able to hear anything...
2011-11-16 07:15:53
#27
i think of it like this: if the clips arent totally secure then you have a loose throw out bearing that could potentially be making partial intermittent contact with the output shaft or be vibrating which could possibly cause the rattle. it seems very logical to me considering how many of us have had new/rebuilt transmissions that STILL have this annoying rattle with the clutch engaged (pedal released) in neutral. i mean hell, the relatively newly rebuilt P11 tranny i bought from stratton had this rattle.. as did my old nx2k transmission.

if u have bad bearings in your transmission then there will be other sounds that arent related to this rattle sound: bad output shaft bearing will make noise only when the car is moving in any gear. bad speed gear bearings make noise only in the gear that has the bad bearing. throw out bearing noise makes noise when the clutch is disengaged (pedal being pushed) bad bearings tend to sound more like a whine/growl that changes in pitch the faster they spin. that rattle never changes in pitch. u can rev the shit out of ur motor in neutral and that rattle stays the same... that right there pretty much rules out the input shaft bearing.
2011-11-24 18:40:04
#28
Late replying to this, but you have some very valid points. I resealed my lower oil pan the other day and while the car was in the air, (me under it) I was moving the drive side tire back and forward and it sound like the TOB was possibly off track. It had slight skating type sound install of a growl/grind. Why are the stems designed like that for those clips to just sit on? Couldn't they have designed something more secure? Is that another way to secure the TOB better? (Just for reference, do the Honda boys have the same type design for there B-Series transmissions?)
2011-11-24 19:23:38
#29
the trans i replaced my cracked one with makes noise, it only really does it on warm up tho, once the cars warm there is no more noise.. the sound goes away with clutch pushed in.

i figured i got 2 broken trans i've been planning to make into 1 an while i did that i would put in new bearings an seals.
+ Reply To Thread
  • [Type to search users.]
  • Quick Reply
    Thread Information
    There are currently ? users browsing this thread. (? members & ? guests)
    StubUserName

    Back to top