T100 Trans whining (1 Viewer)

[Patman]

Got a 95' T100 3.4 5 spd.
There is a fairly loud whine (It's not my wife) that comes from the trans/clutch area and stops when the clutch is full depressed.
It happens whether in neutral or in gear, though in 4th gear I don't hear it as bad.

Also and probably unreleated, the clutch doesn't seem to disengage until fully depressed all the way to the floor. No problems with the pedal bracket or the master/slave cylinders.

Any ideas on suspects would be cool, I just bought the truck for a good price and otherwise it's a gem.

 

[Bear80]

The first question is how many miles are on your truck?

The wine is most likely the clutch throw out bearing but could also be the pilot bearing; either way both should be changed during a clutch job.

I belive that the throw out bearing is worn enough/out of grease that while the pressure plate is engaged the bearing is turning with light pressure and screaming. Then when you press the pedal, i.e. engage the throw out bearing fully against the pressure plate forks, the pressure on the bearing is enough to shut it up.

As far as the disengagement, how is the engagement? A new clutch will/should engage right off the pedal floor, which means it also will not fully disengage usally till the pedal is more than half way down to the floor. Has either the master or slave cylinders been changed to a non-Toyota part? Also there is an adjustment in the pedal, BUT if the master has never been changed then there should not be a need to adjust the pedal.

Back to mileage, usally a daily, city driven clutch will see around 130k miles. A worn clutch will not engage till nearly at the top of the pedal, likewise it will disenge also at the top. I can say that my '94 4Runner got over 200k on the original clutch with 95% highway miles. And it was a pressure plate fork that broke, while the clutch disk still had about 30% material left on it.....just amazing, wish I took pictures.

 

[WristPin]

try to duplicate the sound, while t case in in neutral.
no stress on the clutch, no noise.
if there is noise still. suspect trans input shaft bearing.

 

[nat88toy]

95% sure its the main bearing in your trans my 4runner has been doing that for about a year not the wine is hardly noticeable thow but i can tell that it is there, if it is realy loud id swap in some new bearings...good luck

 

[Bear80]

I have to disagree with the input shaft bearing. It is usally the counter shaft bearings in the transmissions that go bad. If it is a counter shaft bearing, you will have the most noise in 3rd and 5th, with almost none in 4th since it is a straight through. Neither of the bearings input or counter shaft will have a whine like noise, usally it will be what sounds like gear noise.

In your case the assesment of the sound is not what a bad input shaft would make.

My near beat to death '86 4x4 had over 250k when we finally rebuilt it and the input shaft bearing was not making much noise.
My replacement tranny out of a '87 4x4 had about 160k when the counter shaft bearings started making noise.
My '94 4runner with over 220k when I sold it never had a hint of input or counter shaft bearing noise.

From my 3 cases I have found that extra load, ie bigger tires and stock axle gears will cause the bearings in the transmissions to prematurely wear out and a stock daily diver should have no problems.

 

[Patman]

The truck has 185K. The whine is most noticable in neutral with the clutch out. It is also very noticable in 1st and 2nd with clutch pedal out. It may exist in the higher gears but the engine noise makes it hard to determine.
When I depress the clutch pedal completely the whine slows down and then comes to a stop, like something spinning and then coming to a rest.

If I change out the tranny, will a used Tundra 5 spd be an exact fit? Does the engine need to come out with the trans as the repair manuals say?

It does run great but the whine is annoying and the fact you know somethings not right.

 

[Patman]

Forgot, it's definately a whine and fairly high pitched.
I would of suspected a throw-out bearing but with the clutch engaging with the pedal near the floor the bearing shoud be clear with the pedal released. Also the whine is there until the pedal is fully and I mean fully depressed.

 

[Bear80]

I would sitll have to say throw out bearing, due to the high pitched whine. The bearings in the transmission are constanly lubed by gear oil and the whine is when a bearing is usually running dry. Which the throw out bearing is a sealed grease bearing and when bad will cause a whinning noise.

I'm still curious to know if your clutch disengages near the floor or engages, you have said both, so which is it?

 

[WristPin]

The truck has 185K. The whine is most noticable in neutral with the clutch out. It is also very noticable in 1st and 2nd with clutch pedal out. It may exist in the higher gears but the engine noise makes it hard to determine.
When I depress the clutch pedal completely the whine slows down and then comes to a stop, like something spinning and then coming to a rest.

If I change out the tranny, will a used Tundra 5 spd be an exact fit? Does the engine need to come out with the trans as the repair manuals say?

It does run great but the whine is annoying and the fact you know somethings not right.

what ever bearing is making noise, in the tranny, fixing just the bearing will be cheaper, than a different trans.

the noise is definatly not the t/o bearing.
it is compley separated from being spun when the clutch pedal is not touched.

when you take out the trans, grab the input shaft. it will have play.

the same concern you describe is identical to the way my L52 trans is. that one has a worn input shaft bearing.

did you put the t case in neutral, and try like i described?

 

[Patman]

Thanks for all the help, these posts are great.

To answer the last few questions. There is no transfer case, it's not 4WD.
The clutch engages/disengages with pedal just about to the floor and the whine stops right there too, at the floor. I would suspect a TO bearing but with so much play in the pedal I have to think it is clear of contact when released. I need to make sure the fork is retracting all the way just to be sure.
As far as shaft bearings, if it whines bad in neutral then wouldn't it be the input shaft and not the counter shaft? Maybe its both!


Does anybody know if the engine has to come out with the trans or is it possible to drop it from underneath?

 

[Bear80]

The transmission comes out from underneath the truck. I'm curious to know the code, since I am only familar with the 4x4 G and W series codes and the W5* series which came in some older 4x2 models.

I've seen a lose front input shaft and yes the bearing was bad causing the play but no whinning noise as you disribed, bad transmission bearings make a much different sound. The fact that you discribe it as HIGH pitched points to a sealed grease bearing going dry/bad. Yes the t/o bearing should not be incontact with the pressure plate forks when the pedal is released, however it may be possible since you have a "wierd" pedal.

As far as the pedal, probably the master or slave is on the way out. Look up fron the inside of the cab an check to see if there is any fluid on the shaft of the master. If not check the slave.

 

[2ndGenToyotaFan]

When I depress the clutch pedal completely the whine slows down and then comes to a stop, like something spinning and then coming to a rest.

It's in the tranny, not the through out bearing or pilot bearing, they start spinning when you push the pedal in. And if you did that test with in in nuetral than it's on the input shaft somewhere (also sounds like input shaft because it's making noise in every gear...) Had the same thing in my 86 mini.

 

[Bear80]

Man just pull the transmission already and have some fun. I'm probably wrong and if you change the t/o and it doesn't fix it. At least the secod time you drop the tranny it'll be faster since you've done it before.

This is completly a pun of myself.