I did the job and ended up dropping a valve stem down into the engine. I panicked and was so close to removing the head....the valve was on the passenger side and so all I did was take off the exhaust manifold and the valve stem was right there. Plus I could see all the pistons. Thats just an FYI incase you do lose one, don't panic. Removing the exhaust manifold is easy.

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1990 190E 3.0L