I have just noticed unusual noise in my 350 SDL, and on troubleshooting noticed what I think is abnormal play by holding fan blade assembly and flexing it against shaft ... looks like it is the shaft from the fan blade assembly to the viscous coupling ... does you E have this sort of a set up, too?
With 130K on it, I guess I do need to replace the pump, too ... how about the thermostat? Since it is all apart, guess it makes sense to replace?
I'm in Fairfax Station ... have been through ASC several times and have never been exactly overwhelmed by anything ... lots of talk ... greatest line was from their lead used car salesman who stated that "among the MB dealers in the area they were the Nordstrom dealership."
1991 350 SDL (200K and she ain't bent, yet)
former 2002 E320 4Matic Wagon - good car
former 1985 300 CD - great car
former 1981 300 TD - good car
former 1972 280 SEL - not so good car
a couple of those diesel Rabbits ...40-45 mpg