Transmission & Drivetrain Gearboxes, Differentials, Clutches

Input Shaftbearing noise?

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Old Mar 4, 2011 | 01:08 PM
  #1  
wtsapexipowerfc's Avatar
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Default Input Shaftbearing noise?

In addition to a bearing noise when the clutch is released and the car idle..I have recently noticed a sound even while driving the car...

Below are my findings

I was investigating the bearing noise this afternoon and I found that when I rev the engine (reved it from inside the engine bay) I heard a very clear and loud bearing noise of some sort as I pressed the throttle to increase the revs... Basically there is a bearing noise at idle from the transmission, the noise gets more clear and louder as you rev the motor...Any ideas??/

What does this conclude?
The noise has become evident at low engine speeds while driving (clutch out)
I am 100% sure it is coming from the transmission. The alternator is on the driver side right? I forgot to check..
Does the starter have bearings in it? if there are bearings in the starter.. could this be causing noise?

Its not an engine noise at all. I am just unsure if it is the clutch and transmission or just the transmission on its own? When the transmission was originally put in about a year ago the bearing noise was evident but quiet it has progressively became louder over the past year.

I will be replacing the transmission within the month, I will report back my findings.
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Old Mar 4, 2011 | 02:41 PM
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Aquafina's Avatar
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Default Re: Input Shaftbearing noise?

Could be a number of things. The starter has bearings, but it only spins when you turn the key over or short the starter manually.
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Old Mar 4, 2011 | 02:46 PM
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wtsapexipowerfc's Avatar
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Default Re: Input Shaftbearing noise?

ok then what in the transmission or the clutch assembly would increase a "bearing noise" when the throttle is applied to raise the rpms?
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Old Mar 4, 2011 | 08:57 PM
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Default Re: Input Shaftbearing noise?

A bearing thats in bad shape. Sometimes a missing tooth on a gear, though usually that creates a whine.
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Old Mar 5, 2011 | 06:41 AM
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David @ Synchrotech's Avatar
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Default Re: Input Shaftbearing noise?

If you hear the noise in neutral with the clutch out, and it goes away when you depress the clutch, it is probably the mainshaft bearing in the transmission.
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