i dont think there is but is there anyway to differentiate between a center case gasket leak, pv linkage leak or crank seal leak (worst comes to worst well just pulloff the right case cover to check the crank seal)? just did a bottom end on a 01 cr250. performed a pressure test and found air exiting tranny vent tube. we used regular valvoline "moly fortified" grease (pretty much just ngli #2 wheel bearing grease) for the pv cavaties. brand new crank seals of course that were greased up before install. everything seems fine and no leaks anywhere outside the cases where the halves meet. so if its a center case gasket it must be leaking internally. so like i said, is there any tricks to help differentiate between the 3 on where the leak is coming from?