I've got an apt with an old cast iron sink and the classic kitchen faucet coming out of the wall above it. Chrome fixture, hot and cold joining together in a spout that spins side to side. Had a serious continuous drip. Figured it was washers and seats. Took it apart. Sure enough, washers were shot and seats were worn out. Replaced seats and washers. Put it back together and turned on water. Still had a steady continuous stream with the faucets off. I've taken it apart about 5 times, checking that seats are tight and washers are correct and in position. No difference. I still have a continuous steady stream of water about an eighth or a sixteenth of an inch wide. Anybody have any idea what is going on? Could that much water be getting by the seats? Seats looked to be identical replacements although on old faucets it is hard to tell. The were 9/16 but threaded into the 18,20,22,and 24 threads per inch holes in the test board. I think the replacements were the 18 threads per inch. Could the water be getting by the threads?
Washers seem to be working. Open the taps and water flows. Close the taps and water shuts off promptly except for this continuous flow which seems totally unaffected by how much torque I put on the taps. It's almost as if there is a separate supply of water causing the stream, independent of what is going thru the seats and by the washers.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
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1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13