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post #1 of (permalink) Old 05-12-2007, 04:40 PM Thread Starter
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whirring noise - throwout bearing?

Ahh the debugging continues. So my truck (88 4runner, 22re) makes a whirring noise that completely goes away when the clutch pedal is pushed in. It is fairly high pitched, and raises in pitch relative to engine speed. It does this if the trans is in neutral and/or while driving through the gears. Any ideas?
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post #2 of (permalink) Old 05-12-2007, 06:34 PM
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The release bearing (throw out bearing) when bad, usually makes the noise when the pedel is being depressed.

In your case, sounds like a pilot bearing problem.

-WayneM
1984 Toyota p/u
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post #3 of (permalink) Old 05-13-2007, 12:18 AM
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It's the input shaft bearing. The throwout and pilot bearings only turn when the pedal is pushed down, and the input shaft stops turning when the pedal is down...

I'm pretty sure the front bearing can be changed from the outside of the tranny (You still have to pull the tranny, but don't have to tear it apart) and is usually the problem...

Jerod

"Hiking is just walking where it's ok to pee.....
Sometimes old people hike on accident....."

89 4Runner "The James Caird" Yeah, I named it.
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post #4 of (permalink) Old 05-13-2007, 01:16 PM Thread Starter
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What is the process for replacing this bearing? Does anything need to be pressed? Do I have to remove the input shaft?

Last edited by andykrow; 05-13-2007 at 01:51 PM.
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post #5 of (permalink) Old 05-13-2007, 04:38 PM
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Sounds like what I had 3 yrs ago. Had to drive with it like that for 8 months until I got back home from school. Noise subsides when crusing in 4th, cause "4th gear" just locks up the main shaft and does not transmit through the cluster gear.

It was a pitted inner race on the input bearing. Get the number and source it from a bearing shop, about 1/3 the price then at dealer. I got a whole bearing kit and did both shaft bearings and needle bearings in the main shaft. Get quality input shaft seal, and overfill tranny with double normal capacity synthetic oil.

Last edited by 5440; 05-13-2007 at 04:46 PM.
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post #6 of (permalink) Old 05-13-2007, 04:40 PM Thread Starter
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So what is the worst case scenario when this bearing seizes up? complete tranny failure or what? The noise doesn't sound "horrible" It isn't very loud and there isn't any grumbling...
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post #7 of (permalink) Old 05-13-2007, 05:01 PM
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I bet just gradually gets worse. I think as the beaing get looser, you may notice gear rubbing as the input shaft begins to deflect sideways more. You may be able to go longer with it, but if it was me, I'd get it fixed sooner rather than later to find out what may happen.

I would not tow anything, avoid mountains, hammering on it, avoid 5th, use 4th instead. Overfill the tranny with oil. These trannies have a lube problem with that bearing. Overfilling should ensure the bearing does not run any dryer and may help prolong the eventual bearing failure.
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post #8 of (permalink) Old 05-17-2007, 06:59 PM
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Quote:
Originally Posted by WayneM View Post
The release bearing (throw out bearing) when bad, usually makes the noise when the pedel is being depressed.

In your case, sounds like a pilot bearing problem.
Hi Wayne,

It's probably lack of sleep .... but it can't be a pilot bearing. Think about it, when the clutch is released the flywheel and the input shaft are locked up, the pilot bearing only turns when the flywheel/engine is spinning at different speeds than the clutch disc.

gNARLS
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post #9 of (permalink) Old 03-11-2012, 05:14 PM
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So, I had posted a series of questions on a forum that is now defunct. The forum was something like offroad toyotas, I think mudrunner tried running it for a while.

Anyway, there was a similar thread describing a whirring noise coming from somewheres around the tranny bell housing, and I went to read it for some help.

At the time, I could only hear the whirring bell like sound when travling in 1st or 2nd gear around 1500 - 2000 rpms.

But, I can now hear it at idle, in neutral...just barely.

If I press the clutch down, I can hear it unless the clutch is completely engaged (all the way down to the floor). 1 inch above the floor and I can hear it.

My question, is: does this sound like the pilot bearing?

Cheers


Quote:
Originally Posted by 2ndGenToyotaFan View Post
It's the input shaft bearing. The throwout and pilot bearings only turn when the pedal is pushed down, and the input shaft stops turning when the pedal is down...

I'm pretty sure the front bearing can be changed from the outside of the tranny (You still have to pull the tranny, but don't have to tear it apart) and is usually the problem...
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