Slick 60's

Have a 64 f100 long bed came with a tired 223. Switched over a year or so ago to a used 292, got the proper bell housing and clutch assembly (I think?). Kept the 3sp manual from the six and all has gone fine driving and shifting. Except the engine I got was worn out. So, I got another used 292, this one, much better shape. So when dropping in the newer 292 in I still plan to run the bell and trans BUT I am replacing the clutch Pressure plate and throw-out bearing.
so here's my dilemma. Bought a new disc and pressure plate and throughout bearing, same numbers and even compared them to what I took out. Match, except the hubs of the older disc has been rubbing on the input shaft sleeve. With out any issue. I installed all the new stuff AND…clutch pedal went almost straight to the floor? barely engaging. Thought maybe I had flipped the disc, NO, not it. Took parts back to clutch shop an they were stumped (been in biz 50 years). But they did notice that the old disc had been rubbing on the input shaft and recommended they machine down the hub about 1/8th inch for more clearance and that also might fix my other problem.
So I have reinstalled the new modified parts and am planning to stab the trans back in tonite.
The shop and I was stumped but they very helpful and hopefully this will fix it.
Has anyone had this issue occur and have a solution otherwise. I've checked the adjustment rod and it is all the way out now and has a return spring.
Any ideas or comment are appreciated, Thanks

You need to have someone push the clutch in while you are under the truck to see what the moving parts are doing. 3 finger (Long) clutches have an adjustment for the release lever height. It may be adjusted with the levers closer to the plate than the old one. If you switch from Long to diaphragm, you definitely have to make the rod longer, but I am guessing that you didn't do that and stayed with the original style clutch.

Dan

check it our before the trans goes in so you can see everything better. For this to happen, either the clutch has moved closer to the engine or there is something off in the linkage/throw out bearing. Did you use the same flywheel as before?

When you say the "clutch pedal went almost straight to the floor? barely engaging," do you mean it went to the floor with no resistance, as in it's not even pushing on the pressure plate or there is resistance but the clutch does not disengage?

suspense...

Dan

Well, I thought I had it figured out and fixed this morning. It turns out the fingers of the new pressure plate were hitting the hub of the clutch disc. And they were also coming in contact with the input shaft collar. My thoughts were, trim or grind down the finger slightly, or trim the input shaft collar shorter by about 1/4 to 3/8th of an inch. Took it back to the shop and conferred with them and they agreed. And even put the collar in the lathe and machined it. also put in a new seal, no charge!
Reassembled all back together and everything slipped back together great. Had proper pedal travel and all felt right.
However, I pushed in the clutch pedal and started it up, everything fine so far…let out the clutch easy and it shuddered and died. Tried again and got it moving but really bucking/shuddering? Something wrong? Crawled under it to inspect and it looks like the collar has been dented or scored from just that quick attempt. I may throw in the towel and take it to a shop but really hate to. I don't see what could have been that different in these new parts except the very slight difference in the finger length. We compared old with new on the bench. Stumped.
I have also considered the flywheel needing a shim or runout check but this doesn't seem likely to me. It is a resurfaced flywheel on a different crank, now.

charliemccraney wrote:When you say the "clutch pedal went almost straight to the floor? barely engaging," do you mean it went to the floor with no resistance, as in it's not even pushing on the pressure plate or there is resistance but the clutch does not disengage?

Yes Charlie- I pushed the pedal down with no resistance only with resistance the last inch or two,not enough to move much linkage

A pressure plate for a smaller input shaft will have the contact points of the 3 fingers on a smaller diameter than a large input pressure plate. The flywheel bolt pattern will be the same so it will mount to the flywheel just fine.
The correct plate will have the fingers move pretty close to the collar, so one for a small input shaft may very well damage the collar when they are moved.
The overall height of the pressure plate may be different as well, which could be why you are out of adjustment and have no resistance when pushing in the clutch - the pressure plate is too thin.

Before you take it apart, observe the movement of all components to see if it is something obvious. Once it is apart, compare every detail of old to new. Lastly, inspect every bit of the linkage system for problems. Do those three things and I guarantee you will find the problem.

That makes sense about the diameter of the pressure plate fingers, although I don't have my original to compare right now. I may have already screwed the pooch by shortening the collar. I did resolve the pedal issue and I THOUGHT the clutch issue.
I've checked the linkage over several time and nothing seems wrong there. I may have a hard time finding another input shaft collar?