924Board.org

[Bockscar]

Ok guys, I have a question.

I recently bought a new throwout bearing guide tube/sleeve to replace my old one. There's a problem though.. The outer diameter of the two tubes don't match up. The difference is extremely small, but the new guide tube has wiggle room inside the throwout bearing.

Old guide tube: 34mm exactly
New guide tube: 33.4
Throwout Bearing ID: 34.05

Is this a problem? How the heck could this have happened?
_________________
Brian
'79 924 - Restoration In Progress
'81 924 Turbo w/EFI - Scrapped

[Bockscar]

Given the small number of views, It's likely that few people actually know the OD of the guide tube. I tend to think that the difference isn't a problem, but my partner disagrees. I'm also not a clutch guy so, I may not know what I'm talking about.

There is a small degree of play when the bearing is full seated on the guide tube, and especially when it is first sliding onto the guide tube. When engaging the clutch at high engine speed, wouldn't the play cause the whole assembly to wiggle out of control? Or would the clutch fork keep it stable? It's hard to believe that less than a millimeter is enough to cause issues but, it's hard to argue with the amount of play.
_________________
Brian
'79 924 - Restoration In Progress
'81 924 Turbo w/EFI - Scrapped

[Grenadiers]

I'll bite. I don't have factory algorithms, or CAD drawings, nor have I measured tolerances for every part on the car, but my guess, is, don't worry about it~! The several tubers I've come across in assembly and dissassembly stages, all had some wear on the tubes. The release bearing is sorta 'fixed' on the pressure plate. The clutch forks I've come across all have had wear on their tines, from shit moving around, like from the sorta fixed release bearing.
Just coat the tube with moly grease, and you should be ok.
_________________
'83 944 Track car.
'88 924S Track car.
'89 944 Turbo
2004 Winnebago Vectra monster RV
2012 Jeep Wrangler
2014 Kia Soul
2001 Ford F350 powerstroke

[Bockscar]