Bob,
I will check this. This was also mentioned with great detail on the Birkin fourm on Yahoo. My bell housing is mounted to the engine with dowels though. I do think I have a pilot bearing issue though. When I first installed the new T-9 the clutch would not release 100%, I drove it and then was fine. I purchased a new pilot bearing from Summit Racing that the ID was way too large for my pilot shaft. I ordered it for the ZX3, the T-9 shaft could be smaller. The next Pilot bearing I ordered from http://www.merkurmidwest.com and the ID is correct. I also ordered seals and T-9 gaskets from them. I will need to wait till pull the engine & T-9 out before I know if the pilot OD is correct and install it.
I plan on doing the R&R after I get all the things listed to check. I hate to do any job like this twice, let alone 4 times!
My first T-9 was dry for at least 6,000 miles. About the same time it started leaking I got a grind on the 1/2 up shift at high RPM and a fast shift. On a down shift there is no grind at all. I developed both problems on the second T-9 within 100 miles, the leak could have been sooner. It could have happened on the first drive as it was over 100 miles.
FYI I installed an 1/8" pipe drain plug and a fill port on the top L of the top cover. I can also check the fluid level with my engine dip stick now.
Gary