How much TOB travel req'd to disengage OE clutch?
 

I am looking for technical detail. OE clutch. Once the TOB contacts the clutch fingers, how much linear travel or movement is required to disengage the clutch?


MY14

Answered!!
I reached out to Exedy. About 8mm.

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Interesting but I have absolutely no idea what to do with this information.

I'll splain it
 

(maybe more info than you expected!)


Well, I have a Hydraulic Release Bearing. (a Tilton cylinder) The bearing froze up and destroyed the cylinder. I resurfaced my flywheel and installed a new OE Exedy clutch. I needed to be sure that my new TOB had the proper clearance between it and the clutch fingers. The Tilton cylinder has a total movement of .7" .

I measured the distance from the bellhousing/trans mounting surface (at engine block) to the clutch fingers and also to the TOB surface (fully retracted) I needed to alter the latter measurement to provide the clearance I wanted. I wanted to know how far the TOB needed to travel to fully disengage the clutch. That's the 8mm that Exedy told me. (I suppose I didn't need this number for sure, but it's nice to know.)Turns out that the cylinder has plenty of movement to allow the clearance I wanted. Tilton suggested .170" to .230" of clearance. I went with the minimum of .170" and added .200" to allow for clutch wear.
I ended up machining my HRB base to get this clearance. (Still waiting on my machinist, though.)