New Clutch Slipping

Redwolff64 · Oct 30, 2012

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 · Oct 30, 2012

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 · Oct 30, 2012

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 · Oct 31, 2012

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 · Oct 31, 2012

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 · Oct 31, 2012

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

Redwolff64 · Oct 31, 2012

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 · Oct 31, 2012

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 · Oct 31, 2012

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 · Oct 31, 2012

Redwolff64 said:
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 · Oct 31, 2012

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 · Oct 31, 2012

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 · Oct 31, 2012

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

Redwolff64 · Oct 31, 2012

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

horse sence · Oct 31, 2012

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 · Nov 1, 2012

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 · Nov 1, 2012

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

horse sence · Nov 1, 2012

coool ,been there done that

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