Throw-out bearing

[Ultramaroon]

Originally Posted by Tcoat

all boys collage

googled

was not disappoint

[xxBrun0xx]

Originally Posted by Tcoat

OK, I have done a pile of research on this and developed a theory. I don't think the throw out bearing itself is the issue but is actually a symptom. The root cause is actually bent or off center release forks. If the fork is not perfectly aligned or is even slightly twisted it can put lateral pressure on the bearing which of course is going to produce premature wear and failure. It would not have to be that far out to cause an issue and could sneak past a visual inspection pretty easily.


Subaru uses a stamped part for this fork (above) and I know that historically (at the one plant I work at) stamped parts such as this have a very spotty quality record since it is very easy to miss small imperfections or errors in specs.

Through the course of my research I found many different cases of failure of these forks on Subaru products right up to them actually breaking (in fact somebody on here broke one and although I am not positive @ichitaka05 's name comes to mind). Now obviously a cracked or broken fork is the extreme and very easy to spot but an even slightly bent or twisted fork could put some extreme pressure on the bearing and cause it to heat up when it is spinning.


Added to the evidence is the fact that many of the guys that have had issues initially just had the forks lubed when they went in. Although the lube seemed to help for a while eventually the bearing failed anyway. This would lead me to believe that the act of lubing at least temporarily centered the fork and took the sideways/angled pressure off the bearing.

Well, there you have it guys that is my theory. I guess the point of my post is to look beyond the direct result and try to find the root cause. If you have bearing issues it may be worth while changing out the fork as well since a bad batch of forks could easily explain why so many have issue but loads of others don't.

P.S. Or I could be talking out of my ass on the subject and am totally wrong.

^ best theory I've heard so far. Wonder how long it'll take for someone to make an aftermarket clutch fork?

[thambu19]

Is there a way to lube the TOB somehow without taking the trans apart?

[thambu19]

I mentioned before that if the Slave cylinder plunger isn't acting on the same place as the pivot point it can cause the fork to acutate in a slightly crooked manner applying more force on one arm of the the fork than the other.


Is there an adjustment/slack where the slave cylinder mounts where we can adjust the position by a mm or so to make sure the point of contact of the slave cyl plunger is right in the middle of the fork?

[Nickosport]

I picked my car up this morning. The reason that I got a new clutch was because the tech cracked the disk when he was reassembling the clutch, after replacing the TO bearing. Although I didn't have time to go see the flywheel, the service rep did say that it was immaculate, and there was virtually no dust. He said they had this same TO bearing issue on a few other BRZs, but it wasn't something he considered common. I guess we will see how long this one lasts.

[HunterGreene]

This is interesting...what I am reading and pulling from all of this is that if you get the TOB replaced under the TSB, its covered under warranty....but if the TOB fails, its a wear item and f*ck you.

Guess I will be listening for the squeal/rattle . I've heard the squeal a few times, but never the rattle and even then never on a regular basis.

[Tt3Sheppard]

Originally Posted by thambu19

I mentioned before that if the Slave cylinder plunger isn't acting on the same place as the pivot point it can cause the fork to acutate in a slightly crooked manner applying more force on one arm of the the fork than the other.


Is there an adjustment/slack where the slave cylinder mounts where we can adjust the position by a mm or so to make sure the point of contact of the slave cyl plunger is right in the middle of the fork?

I just installed a new slave cylinder this past weekend and I don't believe you can even adjust the angle of the slave at all. There are two bolts that force you to line it up perfectly.

[Sigh-on-Rice]

Originally Posted by track junkie

Anyone have or seen this Technical service bulletin from Subaru?
12-190-15R, Oct. 30, 2015, "Elimination of Creaking Sound from Clutch Pedal Assembly."

"This BRZ bulletin provides a procedure to address customer concerns of a creaking sound heard when operating the clutch pedal. The cause of the sound has been identified as a very slight amount of movement between the 2 layers of metal (circled in yellow) which form the specific clutch and brake pedal assembly mounting bracket shown in the illustration and photos."

I am going to ask my dealer to take a look at my car regarding this TSB.

Someone, get us this TSB.

[Ayyad]

Hello guys,
I recently got my 2013 gt 86 with 25000 km.
I started hearing a sound under the gear knob whenever I press the gas or lift off.
The dealer changed the throw out bearing & ordered a new drive shaft(delivery in 2 weeks)
after the car was released the sound got louder and i noticed that the 1st & 2nd gear shifted to the right!!
Anyone faced similar things before?

Thanks

[VenomRush]

hey guys! Just had my new clutch installed due to the symptoms of a bad throw out bearing. Symptoms included: "water through copper pipe sound" when clutch pushed in, loud high pitch squeaking at idle, and car would would shut off if i held the clutch while in neutral without revving above 1k rpm. I have 85k miles on my car, mostly highway with a ton of canyon driving. Noticed the first symptom sound mentioned around 83k, the 2nd symptom at 84k and finally the 3rd symptom at 85k. I feel i got extremely lucky i didnt get stranded anywhere since i use my car for work. I think this is definitely a faulty part and if you guys are still under warranty they should cover it with no cost. Heres the pic my mechanic sent me of my TOB, he also gave me back my old clutch and pressure plate because he said they were in great shape, including my flywheel.

[Tt3Sheppard]

At least the clutch and flywheel are good.

[mmmcambelsoup]

Originally Posted by VenomRush

hey guys! Just had my new clutch installed due to the symptoms of a bad throw out bearing. Symptoms included: "water through copper pipe sound" when clutch pushed in, loud high pitch squeaking at idle, and car would would shut off if i held the clutch while in neutral without revving above 1k rpm. I have 85k miles on my car, mostly highway with a ton of canyon driving. Noticed the first symptom sound mentioned around 83k, the 2nd symptom at 84k and finally the 3rd symptom at 85k. I feel i got extremely lucky i didnt get stranded anywhere since i use my car for work. I think this is definitely a faulty part and if you guys are still under warranty they should cover it with no cost. Heres the pic my mechanic sent me of my TOB, he also gave me back my old clutch and pressure plate because he said they were in great shape, including my flywheel.

What clutch kit did you end up replacing the oem with and was the TOB included? I see your exedy box, I've read people having issues with that setup. Any issues thus far? I believe my TOB is otw out. Thanks!

[VenomRush]

Originally Posted by mmmcambelsoup

What clutch kit did you end up replacing the oem with and was the TOB included? I see your exedy box, I've read people having issues with that setup. Any issues thus far? I believe my TOB is otw out. Thanks!

I got the stage 1 from ft86speedfactory. It did come with a TOB. Also forgot to mention the clips holding the original TOB to the fork were toast too. no issues yet, shifts feel buttery smooth and 1st isn't hard to get into anymore. Still in the process of breaking it in which will only take me a week. The pedal doesnt feel hard to push in as the instructions suggests, but i think thats because it was harder to push in with a jacked up TOB.

[Mr.Eightsix]

Did your new clutch kit come with the new clips for the TOB?