[Fot] opinion - SOLVED...maybe

[Phil Gott]

This brings to mind a lesson learned the hard way. Diaphragm pressure plates need to be mated with the correct configuration throwout bearing.  The fingers on the plate want to roll on the throwout bearing. If the fingers are straight, the bearing needs to have a curved surface. If the fingers are curved, then a flat faced throwout bearing will work. If a flat faced bearing is used with flat fingers, there could be a very sudden movement and engagement as the fingers transition across the face of the bearing from the inside to outside edge.
Depending on the set up and initial orientation of all parts, this may or may not happen in any particular case.
I did not raise the issue when Nick first asked for opinions, as the Duke of Oil’s problem happened all of a sudden.
Phil

Sent from my iPhone

> On Apr 22, 2020, at 9:42 PM, Ponostyle via Fot <fot at autox.team.net> wrote:
> 
> I switched to a radial bearing to solve a similar issue with Peyote. For a while I was using a quartermaster dual plate rally clutch and it was like a switch with the standard throwout bearing. I fiddled with several things to try to make it work more progressively, but the only thing that really helped was ditching the standard setup and going radial. Unfortunately they take some fiddling since it’s easier to overstroke the clutch and break it, but once you get that sorted it’s much more controllable. 
> 
>> On Apr 22, 2020, at 5:38 PM, Nick Black via Fot <fot at autox.team.net> wrote:
>> 
>> The crank is good and the thrust washers were perfect (the engine is out for a refresh).
>> The diff has been run for years so I assume everything was happy in it until this clutch fiasco broke it.
>> 
>> As an olde partner of mine used to say "I've been uptown and downtown, seen Tobacco Road twice and thought I seen it all...but I ain't never seen this"
>> 
>> Everything I have looked at was well within spec and looked good and I was pretty sure nothing had been "fixed" so far. As depression had set in I sat and contemplated everything and a good thing too as I noticed what I thought was an optical illusion. It appeared as the throwout bearing sleeve (the nose cone on the trans) was pointed down! It was difficult to measure, but at the end closest to the pplate it was pointed down about 100 thou toward the ground.It "looked" like the gap twixt input shaft and the inside of the sleeve was about 1/8" at the top and about 1/4" gap at the bottom!!!
>> 
>> The sleeve appears to be straight, the input bearing flush to the case and the sleeve tight to the case. So, how would the sleeve not be parallel to the input shaft?  I even reseated the input bearing to be sure it was tight to the case and not "cocked". This trans case does not show any cracks and has been on the car for 20 years without any issues.
>> 
>> Don't know how this could occur or if it would cause this issue but its not right. Looks like I need to get another case out of the shed and exchange pieces.
>> 
>> 
>> I do some of my best work while it looks like I'm just sittin there in NorCal
>> Nick
>> 
>> PS If we ever get back on track this year, we'll see if we caught it and I'll let you know.
>> Thanks for thinking about this
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