I have a 1990 190E 2.6L and when I start the engine I hear a weird noise.....hard to explain sort of like a low "clum-clum-clum" noise coming from the engine. I have a leaky valve cover gasket for sure that I need to replace, so while I have that of I would like to know if anyone has any idea of what it could be under there making that noise and what I need to do to resolve it. Thank you for your help in advance.

Unfortunately, noises and vibrations are BY FAR the most difficult things to diagnose over the internet.

Try localize the area of the noise.

Well I know that its coming from the crankcase where I pour in my oil. Just not sure what it could be.

Belt?

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra

No, coming from inside the valve body. I just took off the valve cover, cleaning it up a bit. I need to order a new gasket and distributor cap