Need help! Clutch Fork Problems

[darylP]

Hello all. Have not been on this forum for a longtime. But in need of your knowledge. My 92's clutch stopped releasing. After removing the Trans I found that the lower PIN that retains the Throwout bearing to the fork had broken. This part is no longer being made. Is there a source for a replacement for these pins? I have been thinking of pulling the pins and seeing if I can thread the fork for some type of bolt that will hold the Throwout to the fork. I really need to get this car running again. But have not been able to locate a source for the pins. Any info would be helpful.. Daryl

 

[shomtx95]

i think you may have another problem, all these pins do is hold the bearing on the fork so it dosent fall of when you install the tranny. I think you can use zipties. How does the fingers on you pressure plate look??

 

[93rev2sev]

what he said.

that little plastic pin would be badazz if it had that kina powah.

 

[darylP]

Due to the lower pin breaking the pressure plate fingers are shot. I have a new clutch kit from ShoNut. But need the pins to be able to reinstall the trans. And yes the pins attach the bearing to the fork so it will travel back and forth the the fork fingers.

 

[darylP]

what he said.

that little plastic pin would be badazz if it had that kina powah.

Maybe I need to take a closer look. But I thought the pins attached the bearing to the fork so that the bearing will move when the fork is moved. I must be wrong. So what pulls the bearing back off the pressure plate when the fork is moved back?

 

[darylP]

So is there a source for the plastic pins?

 

[darylP]

This Clutch set was installed by a dealer's shop after I purchased the car from them 5 years ago. I'm thinking now that the quil on the tranny might be worn and allowed the bearing to tip and wearout the pressure plate fingers and to break the pin. The kit from Shonut has the sleeve that goes over the quil. So that might have been what happened.

 

[SHObill]

the fork has two arms that push the TObearing into the fingers to release the clutch. If one of the forks broke that would be an issue. What usually always fails on these MTX's are the ball bearings in the TObearing bind & then wear the fingers so you then do not get full disengagement. The clutch job we just finished last night had NO QUILL SLEEVE & a rev'B' TObearing that the seal had gone on & there was no grease left & the ball bearings were bound up causing 3-4 PP fingers to be worn through. we also found that the bushing that installs in the tranny case that the clutch cable runs through was also missing! Which would also add to the 'non clutch release issue' the car had when we bought it. A new clutch cable was installed to attempt to get the clutch to release but they forgot/lost the bushing!

 

[darylP]

I just got back from looking over the car. There is a quill sleeve installed. With the replacement bearing on the sleeve there is still some rocking motion in the bearing. I also noticed that the fork shaft has some play in it so would think a new set of bushings would help there. When this clutch stopped working there was no bearing noise. It just would not release.

 

[93rev2sev]

If you've got the trans out, take a picture of the clutch assembly and post it.

 

[darylP]

Maybe I'm just looking at a bearing lockup.








But without any of the normal bearing noises.. This is the third clutch for this car since we have owned it. I know they are bad on clutchs and it always seems to be the throwout that goes bad. Maybe on my car it's the shaft bushings that are taking the bearings out.

 

[SHObill]

That PP & TObearing look just like the ones we pulled from the 89 we just bought.

--see, the TObearing has no seal &/or grease left in it!

--Yea, ours also had no weird noises to suggest the condition of the parts we pulled.

 

[darylP]

That PP & TObearing look just like the ones we pulled from the 89 we just bought.

--see, the TObearing has no seal &/or grease left in it!

Yeah it's dry.. And all the other bearings I have has a black seal.. Maybe i'm just over looking the norm. And thought that the missing pin caused the fingers to wear on one side... and it was just the bearing locking up.

 

[SHObill]

Yeah it's dry.. And all the other bearings I have has a black seal.. Maybe i'm just over looking the norm. And thought that the missing pin caused the fingers to wear on one side... and it was just the bearing locking up.

Typical MTX TObearing failure!

 

[93rev2sev]

What usually happens (the last few clutches I've done were all the same)...

The fingers eventually get worn through. This happens naturally but normally takes a very long time...longer than most clutches last. But, when the TOB starts to get gritty and begins slipping on the clutch fingers, wear is accelerated dramatically. "End game" for TOB/pressure plate fingers usually goes like this:

One or two of them break and now when you press the clutch, those broken finger tips tear the seal on the TOB to shreds since they're too short to reach the bearing surface. You might not even notice this event and the clutch may continue working great for a while. One-by-one though, adjacent finger tips get worn through and more damage to the TOB occurs with each shift until eventually, a bunch of the fingers are broken and the clutch stops disengaging.

 

[93rev2sev]

yeah...that.

 

[93rev2sev]

There's supposed to be a bolt holding your fork to the shaft...???

 

[darylP]

There's supposed to be a bolt holding your fork to the shaft...???

Yup pulled the bolt was going to remove the shaft and look at the bushings.

 

[93rev2sev]

Those PP fingers seem to have been cut off prematurely.

 

[93rev2sev]

That would have to be the fault of the pressure plate.