New Clutch Slipping

[Redwolff64]

I recently put a new pressure plate and clutch disk in my 1965. It has a I6 200 with an 8 1/2 inch flywheel that was resurfaced, since they aren't remade anymore. I also put in a hydraulic clutch, using an internal hydraulic throwout bearing. I know the bearing is adjusted correctly, but I still get spin. The RPMs and the speed stay consistent, but I can hear the spin. It is hooked up to a 1994 t5 with the correct adapter plates for it, including the one to use the 94 and older. I can also make it spin if I put it in neutral and floor it. I had a leaking valve cover, but it was replaced and has a new gasket, so it's not oil. Any other ideas? This is really frustrating me.

Thanks, Randall

 

[rbohm]

by "hear the spin" what do you mean? are you getting a rattling sound when the clutch is engaged, but goes away when you push the pedal down?

 

[horse sence]

does the motor rev with out the car speeding up when in gear ?that would mean it is slipping. did you install the disk correctly/right side up?

 

[zookeeper]

How do you know the internal bearing is right? It sure sounds to me like maybe the bearing may be too far into the pressure plate at rest. I have a cheap ($80) borescope that is great at snaking into tight places (like the bellhousing) to see that there something like the throwout bearing is adjusted right. I recommend trying to back off the adjustment a bit, but I know that's not easy or even possible with the trans in place.

 

[Redwolff64]

rbohm: Its not a rattling. Its a consistent sound. I believe it is slipping because I am getting the same sound as before I did the swap. The old clutch slipped like crazy. I hear it when the clutch is engaged. I hear it most when I give it just a little gas, but if I floor it, I can't hear it. That may just be because the engine is louder though.

Horse Sence: The rpms and the speed are consistent, I can't rev it. I know I installed it correctly. I even took the transmission off to double check when I was having problems.

Zookeeper: I actually have kept moving the throwout bearing back to see if it was to far forward. Right now, the bearing is far enough back that I have to turn the car off to put it into 1st gear, so I am pretty sure it is far enough back.

I appreciate all your guy's help on this. I don't want to drive it until this gets figured out.

 

[horse sence]

check and see if the fly wheel is rubbing the backing plate behind it. the backing plate may be bent and rubbing

 

[Redwolff64]

Actually, that makes sense. When I took the plate off, there was a spot that looked like it had been heated. That very well could have been the sound I was hearing before and after the swap. Thats why I come here. People who know the uncommon fixes. I will check that and get back to you. Thanks.

 

[horse sence]

does the thruogh out fork have a return spring to keep it off of the bearing?
if not it may be constantly ridding on the through out bearing

 

[Redwolff64]

There isn't a fork. The throwout bearing is an internal hydraulic. It just rides on the input shaft, on a threaded piece.

 

[horse sence]

There isn't a fork. The throwout bearing is an internal hydraulic. It just rides on the input shaft, on a threaded piece.

thats right, you did say hydraulic so you can eliminate that

 

[rbohm]

its possible that the pressure plate itself is not fully engaging the pressure plate. the 8 1/2" clutch system is finicky in that manner being as it is recessed. did you replace the pressure plate? if not then the springs are probably quite weak at this point.

 

[Redwolff64]

I did replace the pressure plate. What Horse Sence said makes sense. I haven't gotten into the shop yet to check the plate behind the flywheel though. Is that a necessary piece? I know it is a little beat up and not perfectly flat anymore, but I can't find a new one for the I6 anywhere. If I take it off, is there any risk of something getting messed up? I was basing my belief that it was rubbing on the fact that I was hearing the same sound after the swap as before, so it would make sense that is was one of the parts that didn't get changed.

 

[rbohm]

if you are talking about the block plate, those are available from national parts depot, and a few other suppliers new.

 

[Redwolff64]

NPD doesn't have them for the I6. Just the V8s.

 

[horse sence]

did you notice a shinny or scraped spot on the block plate somthing that looked like it may have been rubbing?
the plate does need to be there it helps center the starter.

 

[Redwolff64]

When I took the flywheel off to be resurfaced, I did notice a hot spot on there that had been discolored from heat. I will be taking the flywheel off today to check it and see if that is the problem.

 

[Redwolff64]

Horse Sence was right. It was the plate. Thanks to him and all that helped.

 

[horse sence]

coool ,been there done that