I am curious as to the proper method of advancing the cam timing on the m103 engine. The fsm seems pretty ambiguous to me. It shows to line everything up to TDC, then remove the cam sprocket, I'm assuming flip the sprocket over so that the front of the sprocket (side facing the radiator) now faces the windshield...and thats as far as I get. I see it says to mount it so that the locating pin lines up with the sprocket, but should the cam be turned so that the journal in the cam shaft is slightly before the TDC mark on the head while the crankshaft remains stationary? And if so, by how much? I have a spare complete m103 that I've been trying to mock up this cam advance, but following these vague instructions and trying to interpret it the best I can, I cannot get the same results consecutively, so something that I'm doing is wrong.

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1990 190E 3.0L