Greetings all, after changing the rubber seal between the upper and lower front cover of my '91 300SE, a piece of cake repair BTW, I degreased the engine and after the rinse down (engine cold, BTW) the smog pump sounds like a bearing is running dry. The noise decreases at highway speed or acceleration and is most noticeable at idle. It wasn't doing this before the seal change, oil leak seems to be gone whew. What have I done by cleaning the engine?? I checked around the threads but could not find much. Thanks in advance

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1991 300SE (my ride, 279,000 miles, looks almost new
1954 Cadillac (21 yo son's car, he bought when age 15)
1972 SeaBird 19 ft runabout (old but solid, slant six, Volvo sterndrive perfect condition, undergoing complete overhaul and refit)
1998 Toyota Rav4 (my sons daily driver when he is in the Continental US, PROUDLY serving in US Navy)