Ditto - tensioner is easily replaced while you have it out for the H2O pump replacement. They don't cost that much, so you're better off replacing while you're in there already.

__________________
08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280

I am continuing the monitoring of water drips.
So far so good. If it was the O-ring, maybe it had a bad hair day and resumed its duty.

I know that is pipe dream material so everybody's tips will serve me well if and when I end up having the pump replaced with all the other stuff.

Car (1998 300SE) has about 136K miles on it......

Update feb 5-08 had mechanic replace water pump.

__________________
1979 300D 220 K miles
1995 C280 109 K miles
1992 Cadillac Eldorado Touring Coupe 57K miles SOLD
********************
1979 240D 140Kmiles (bought for parents) *SOLD.
SAN FRANCISCO/(*San Diego)
1989 300SE 148 K miles *SOLD