Throw out bearing chirping

I have a 2008 Tacoma, 4x4, 6-speed manual transmission, with 105k miles. I purchased the truck 2 years ago with 62k miles on the odometer. Since I took ownership of the truck, it has made driveline noise from the clutch assembly area. I replaced the clutch and throw out bearing at 85k miles. The noise, which sounds like a metallic chirping, persisted. If a small amount of pressure is put on the clutch pedal, the noise is silenced. Otherwise, the chirping persists when idling and can also be heard just as the pedal is depressed when shifting gears. At 93k miles, I replaced the throw out bearing again and the chirping persists. Upon removing the inspection cover on the side of the transmission and with the engine running, the chirping is magnified when the clutch fork is manipulated.

I don't think I am suffering from 3 bad throw out bearings. Why the chirping and noise from the clutch assembly area?

 

By my knowledge, you're suffering from 3 bad throwout bearings. As far as I'm aware, I don't think they've really ever solved the issue with them.

 

I read a thread about a sleeve and throw out bearing replacement designed to slip over the stock input shaft. The kit is from Underdog Racing. Has anyone tried one of these with success? I looked at the design of it and am concerned it would come loose after extended use. Thoughts??

 

If you search on my name I've posted a simple way to fix it and have taken endless s__t from critics. My truck... no noise for several years now.

 

An engineering design flaw from day one within the characteristic of the transmission is all this is .
The engineers designed the clutch without enough release bearing clearance and its a common problem that I have taken endless s__t for from critics .
Same transmission used in the chev Camero and release bearing issue addressed by increasing release bearing clearance ...FIXED .
Unfortunately Toyota has not followed this procedure as of yet .
Your best bet is the URD sleeve and the new bearing , however you are still subjected to the factory minimal clearance of the release bearing coming into contact with the fingers of the pressure plate even if you install the URD kit .
Because of the poor design , you are going to be subjected to frequent release bearing failures.
You can read more here , but there is no permanent fix at this time regardless of what other members say
https://www.tacomaworld.com/threads...on-your-6-speed-transmissiom-write-up.338840/


There is one guy on this board who doesnt have a friggen clue how a clutch works , but continues to preach his madness . I feel sorry for individuals who listen to him .

 

How bad for the vehicle is it to drive it with this sound/problem present? I have had this on my Gen I for at least 40K miles, I have just ignored it.

No issues with the 2nd gen yet, but if it is just a minor annoyance, I would rather ignore it than tear into it.

 

Once again gearcruncher vociferously points everybody in exactly the wrong direction.

NM Lance, the problem is eventually serious. The TOB is vibrating which causes wear on the clutch fingers, wear in the TOB and may eventually cause the gearbox spindle to fail. You're also wasting money on clutches and TOB's if you leave it. Do a search and see the problems. The fix is so simple that it's sad the debate just never ends.

 

Thanks for the feedback. I understand that it is probably not good to leave a squeaking TOB, but I am kind of at a loss as far as what to do... I am not sure if my adjustment is off, or I did not get OEM parts (as I requested) from my mechanic.

I am concerned about aftermarket kits because I am not entirely convinced a sleeve kit will maintain perfect, or near-perfect concentricity with my input shaft. I have spent my last dollar on my gen I given its mileage, but I would like to get my head around this so my Gen II doesn't have issues as well. I listen to everybody on TW and try to make my best guess as far as who is right, sometimes I just have to go with gut feeling and logic... But, I am certainly no mechanic.

 

NM Lance, your truck, your money, good luck.

 

I had the exact same problem with my 08, it happened after I replaced the clutch the first time (w/new TOB). I could never get it to go away. My 09 has the original clutch in it and (knock on wood) still doesn't have the problem at 130k. I think this is a problem with aftermarket clutch kits, or their installations. Because I had the same thing happen with a subaru outback, but only after having a new clutch and TOB installed.

It's annoying as hell.

 

I am not second guessing you. I am just looking for a cheap way out, if possible. I kind of suspect the guy who did my last clutch used non OEM parts. Either that, or the guy didn't adjust it properly... Will have to do some searching I guess.

 

Since you don't seem to actually do a search

https://www.tacomaworld.com/threads/fix-for-squeaking-clutch.272427/

 

Constant load on the TOB is the answer? That's easy, I can just rest my left foot on the clutch all the time. $0 fix, thanks hladun.

 

Anybody know of just a temporary fix to reduce the noise? I don’t plan on owning mine much longer and just want to get rid of the sound.

 

lightly grease the shift fork pivot ball and the cup on the fork.... This will eliminate the noise for a sort time.... but in no way fixes the actual problem...just a short term bandaid

 

An incredibly bad design as far as I am concerned .
I understand that the transmission was beefed up to counter act the missing pilot bearing . After very carefull consideration , I think Toyota needs to do more to compensate for this switch .
When you mash your clutch pedal to the floor , your clutch disc is supported by the input shaft . A rotating clutch disc thats spinning at 3000 rpm creates a lot of load even if it only weighs 4 pounds . In days gone by when you mashed your clutch pedal to the floor , The pilot bearing use to support the clutch disc . Now , when you mash your clutch pedal to the floor , you rely on the transmission input shaft to support the load of that spinning clutch disc
In my opinion , its one of the main reasons you cant keep a throwout bearing alive in the Tacoma .Not the top reason but 1 of the reasons .
Considering nobody has throwout bearing issues with the 5 speed manual which uses a pilot bushing , I may have a valid point
With the above mentioned , is there room to install a pilot bearing or is the input shaft too short to extend into the back of the crankshaft ? also , is there a snub on the input shaft that would except a pilot bearing ? sorry been a while since I did a clutch on the 6 speed manual.
Somebody show me some side views of the input shaft please


To those who question my thoughts , I repair and fix transmissions for a living.
With this said , I am carefull and think out what I post in the forums . I use extensive research as well as experience before I post .

 

Here we go, of on a tangent again. The TOB bearing vibrates when the clutch pedal is up and the TOB is NOT engaged with the disc. Disc stability is not the issue. I had a guy who worked for me who said "if my grandfather's cat had balls he would be a tom, but he didn't and she wasn't".

 

@ricknobinson Temporary fix to reduce the chirping sound? Get a set of foam ear plugs.

OP. This isn't going to fix itself and there is not a simple solution. Bottom line, the TOB is beginning to fail.

Plan a replacement service. While the shop is doing the work, look at the spring fingers on the pressure plate. If any are deformed, show signs of heat, damage of any sort.......then replace the pressure plate. Check alignment on all the parts. Check for deformation. Check for heat damage.

Clutches can get hot enough cause damage.

It is no matter if someone considers this a design issue. Fact is its in the truck and many just like yours are out and about running in the world.

 

I had this fix done on my 2010 Taco a couple years ago. Issue is was the pilot bearing (which is different than TOB).

Does anyone know if this problem exists on 3rd Gen MT? Does 3rd gen use the same tranny as 2nd gen?

 

Thought I would share my experience with the Throw Out Bearing squeal on this forum.

I have a 2007 4.0 6 Speed Tacoma.

I got a shop to replace my OEM clutch with a LUK clutch, after a couple days of driving I noticed a metallic chirp sound any time I engaged or disengaged the clutch. Shortly after I noticed a squealing sound coming from around the bell housing area.

When I went back to the shop who replaced the clutch, they said it could just be a faulty throw out bearing that was put in, so they once again put in a brand new thowout bearing. This only got rid of the noise temporarily, the squeal and chirp came back. I decided to look online and found many threads about this seemingly common issue with these 6 Speed transmissions.

While I spent months reading online, trying to find a solution to this problem, the noise continued to get worse and worse. The options I found to try and solve the issue were either:

- Clutch Masters Hydraulic Release Bearing
- URD Throw Out Bearing Sleeve Kit
- Toyota TSB "Fix"

After reading about people's experiences with the CM Hydraulic Release Bearing (Loss of fluid, inconsistent pedal feel)

I decided against that option because of the mentioned unreliability of the product.

I finally decided to go with a combination of the URD Throw Out Bearing Sleeve Kit and the Toyota TSB.

I had a shop install the URD Kit, while also replacing the original Slave Cylinder and Fork Support that came with my truck with the updated TSB parts.

So far (drive from the shop to my house), there has been no squeal or chirp. I will periodically post updates on whether or not my truck remains squeal and chirp free.