Geoffman72

Well I have my tranny out trying to diagnose a knocking in the clutch.
It only happens at idle, or up to 1/4 throttle in gear and it will go away if I press the clutch in about 1/4 of the way. It also sometimes knocks rather deeply on startup.

I just pulled the tranny, and found theres about 1/2cm of space between where the Throwout bearing and clutch fork meet. So basically in the C shaped area of the TO bearing, it looks like it needs to be bent inwards perhaps.

This is all I can find that could make a knock like this. Any suggestions?

TIA,
Geoff

DaleClark

iTrader: (55)

There is some play where the clutch fork and TO bearing meet - there has to be for the clutch fork to move it back and forth.

Does the throwout bearing spin smoothly, not make any noise, etc?

Also, inspect the pilot bearing, though I don't think that's it.

Dale

SoloIIdrift

I dont know the anwser to your question, but free Bump, since I know I dont want to benchpress the tranny again

Geoffman72

I checked the pilot bearing. To the best of my knowledge, its fine. The seal looks semi crushed, but im not sure that would make too much of a difference.

I forgot to mention, the other day I wound it up high, and above 5,500 it started making the rattling at a fast rate, almost a buzzing. Then something hung because the engine bucked.

Whenever it does this, you can also feel it in the clutch pedal.
I'm completely clueless on what it could be.

I installed an RB 12lb flywheel and ACT clutch back in May, and its been fine until about mid July when the noise started.
The flywheel and clutch seem tight. I dont think its coming from the tranny itself. im stuck

jimmyv13

Are the PP bolts tight?

Geoffman72

They seem to be. I was going to check them with a torque wrench just to rule that out when I go back outside

Nick86

iTrader: (1)

Did you replace the TO bearing? Did you, um no offence, put it on the right way? If the release fork isn't in the little clip things, it could be a problem. Sorry.

Have you checked the main tranni shaft? Putting in and taking out a transmission is hard, and it is pretty easy to bend the shaft. If you're sure it's ok, I'd look at the PP bolts as well.
How did you tighten the main flywheeel bolt to its 300+ lb spec? Are you sure it was tight enough? Did you use loctite? Check and make sure it hasn't come loose, 'cause that would be a serious problem. Good Luck!

3engineRex

does it do it in all gears?

Geoffman72

TO bearing is the one ACT sent me with my clutch.

I havent checked into if the input shaft is bent, but I did this work in May and didnt have the noise until mid July. If it was bent, it would have been immediately known.

I didnt even tighten the bolt all the way to 300ft/lbs. I did the best my wrench would do (275) then put a little unmeasured force on with just a breaker bar.
If THAT came loose I think I would have more than just a knocking noise.

I'm about to check the PP bolts actually, but they do seem tight at first glance.

Heres the question though. RB claims 14ft/lbs is enough for the PP bolts, is this true?

jimmyv13

Did you fix it??

Geoffman72

yep, flywheel nut was backing off

Nick86

iTrader: (1)

D'oh is right! You have to put some serous threadlock on that bitch for it to stay. I dunno about everyone else, but I used some industrial "perminant" loctite.

Glad to hear you caught it before it got REALLY serious!
Nick