C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Worried about whining noise from trans

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Old Jan 12, 2017 | 06:59 PM
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Default Worried about whining noise from trans

during cold weather only about 32 F outside, whining noise coming from somewhere (from trans it seems to be)

Usually after i've warmed up car it disappear, but yesterday it was to difficult to get it out.

Could it be just pilot bearing.. Or something more serious inside trans?
Low oil level?
Yesterday even in cruising in neutral it was... If i rembember right even with clutch pedal pressed down..... So pilot bearing should be cutted out in this situation
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Old Jan 12, 2017 | 08:19 PM
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Oil would be the first thing to check.
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Old Jan 12, 2017 | 08:49 PM
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what trans
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Old Jan 12, 2017 | 10:49 PM
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He has a zf6
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Old Jan 13, 2017 | 06:21 AM
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Originally Posted by 1993C4LT1
He has a zf6
Yes it is zf 6
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Old Jan 13, 2017 | 06:31 AM
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Power steering pump or rack.
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Old Jan 13, 2017 | 06:32 AM
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I think you have a liberal in your car.
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Old Jan 13, 2017 | 06:46 AM
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Originally Posted by bjankuski
Power steering pump or rack.
I have it in hand ready to replace, ( PSP that is whining too) but this is another whining noise, from another part of the car...
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Old Jan 13, 2017 | 07:09 AM
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Originally Posted by juanvaldez
I think you have a liberal in your car.




I think he is

http://www.andrearomano.net/wp-conte...enziromano.jpg

Last edited by Christi@n; Jan 13, 2017 at 07:10 AM.
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Old Jan 13, 2017 | 12:05 PM
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Drive easy when the wife is in the car.
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Old Jan 13, 2017 | 12:34 PM
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Does it whine more when clutch is depressed, if so most likely TOB.
Is it a black tag or blue tag?
Usually the pilot bearing/bushing won't make any noise unless it's truly shot and from my experience it will be more of a grinding more than a whine and the only time the pilot bearing comes into play is when the clutch is depressed.
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Old Jan 13, 2017 | 01:33 PM
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Originally Posted by Lt4-396
Does it whine more when clutch is depressed, if so most likely TOB.
Is it a black tag or blue tag?
Usually the pilot bearing/bushing won't make any noise unless it's truly shot and from my experience it will be more of a grinding more than a whine and the only time the pilot bearing comes into play is when the clutch is depressed.
blue tag it is

you salis "depressed clutch most likely TOB supposed to be Throw out bearing"

after you said "only time pilot bearing comes in play is when clutch is depressed"

you all right?
or did you mean something other?
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Old Jan 13, 2017 | 02:02 PM
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If it does it in neutral and in gear, it could be the output shaft bearing.
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Old Jan 13, 2017 | 03:16 PM
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Originally Posted by Lt4-396
Does it whine more when clutch is depressed, if so most likely TOB.
Is it a black tag or blue tag?
Usually the pilot bearing/bushing won't make any noise unless it's truly shot and from my experience it will be more of a grinding more than a whine and the only time the pilot bearing comes into play is when the clutch is depressed.

can we please get some clarity here, my understanding, and it may be incorrect, is that a throw out bearing that needs to be replaced will make noise unless the clutch is being depressed. My understanding of a good test would be place the stick in neutral position, and do not depress the clutch. if the whining noise is present now it has the potential to be a throwout bearing. If you then deep press the clutch, push the clutch pedal in with your foot, disengaging the clutch plate, and the whining now stops. This would indicate a throw out bearing that needs replacement.
It is my understanding correct or am I off?
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Old Jan 13, 2017 | 03:59 PM
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Originally Posted by 383vett
If it does it in neutral and in gear, it could be the output shaft bearing.
To me too. output shaft bearing or, or maybe bearings on synchros too, these should be parts that are rotating when in trans is cruising in neutral

Last edited by Christi@n; Jan 13, 2017 at 04:01 PM.
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Old Jan 13, 2017 | 04:16 PM
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Originally Posted by VikingTrad3r
can we please get some clarity here, my understanding, and it may be incorrect, is that a throw out bearing that needs to be replaced will make noise unless the clutch is being depressed. My understanding of a good test would be place the stick in neutral position, and do not depress thxe clutch. if the whining noise is present now it has the potential to be a throwout bearing. If you then deep press the clutch, push the clutch pedal in with your foot, disengaging the clutch plate, and the whining now stops. This would indicate a throw out bearing that needs replacement.
It is my understanding correct or am I off?
I think lt-4 396 done some confusion

Pilot bearing = it spins always when clutch is engaged (pedal depressed)
Thorow out bearing = it spinns only when clutch is disengaeged (pedal pressed to the floor)

If depressed pedal means release foot from pedal
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Old Jan 13, 2017 | 04:18 PM
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Originally Posted by Christi@n
I think lt-4 396 done some confusion

Pilot bearing = it spins always when clutch is engaged (pedal depressed)
Thorow out bearing = it spinns only when clutch is disengaeged (pedal pressed to the floor)

If depressed pedal means release foot from pedal

verb (used with object)
1.
to make sad or gloomy; lower in spirits; deject; dispirit.
2.
to lower in force, vigor, activity, etc.; weaken; make dull.
3.
to lower in amount or value.
4.
to put into a lower position:
to depress the muzzle of a gun.
5.
to press down.
6.
Music. to lower in pitch.
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Old Jan 13, 2017 | 05:27 PM
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Originally Posted by Christi@n
I think lt-4 396 done some confusion

Pilot bearing = it spins always when clutch is engaged (pedal depressed)
Thorow out bearing = it spinns only when clutch is disengaeged (pedal pressed to the floor)

If depressed pedal means release foot from pedal


Not sure how your clutch is engaged when you have depressed your pedal to the floor.

**edit, unless your hydraulic system is empty?

**edit 2, I think we have an english translation issue where maybe Christi@n is thinking that DEpress is the opposite of press.

in this instance its not. press/depress same thing. means pushing the pedal to teh floor.

cheers.

Last edited by VikingTrad3r; Jan 13, 2017 at 05:29 PM.
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Old Jan 13, 2017 | 05:28 PM
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Originally Posted by JimLentz
verb (used with object)
1.
to make sad or gloomy; lower in spirits; deject; dispirit.
2.
to lower in force, vigor, activity, etc.; weaken; make dull.
3.
to lower in amount or value.
4.
to put into a lower position:
to depress the muzzle of a gun.
5.
to press down.
6.
Music. to lower in pitch.
Didn't know yet, but got it wrong

Last edited by Christi@n; Jan 13, 2017 at 05:32 PM.
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Old Jan 13, 2017 | 05:34 PM
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Then



Pilot bearing = it spins always when clutch is engaged
Thorow out bearing = it spinns only when clutch is disengaeged (depressed pedal clutch)
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