Hello all,

I am really liking the forum. I am new but everyone is offering kind words. I recently posted about a IP but I have put that idea on the back burner for now because I have discovered an issue that I would like to get around to first so here goes:

I recently purchased a 1991 Mercedes Benz 300D 2.5 Turbo. I bought it because of the condition of the car and the hundreds (literally) of service records. This turbo diesel Mercedes has 331,298 miles on it which is kind of worrying me about the problem.

The engine (OM602) works just fine but I am having issues on this horrible banging noise (almost feels and sounds like I'm being rear ended pretty hard) downshifting and even upshifting. I have looked for a while tonight and have discovered the Bowden cable adjustment method and the vacuum modulator (I have yet to spot this). On the other hand, I have leakage it looks like coming from the transmission dropping off bolts from the oil pan and other places, although it's not much leakage at all it still concerns me.

I am worried the tranny is failing due to the hard shifting and the transmission (yes the discharge is red fluid) from the bolts from the transmission ( it doesn't look as if it is leaking from the housing unit internal on the transmission so I am hoping it's not anything worse than a seal leak.

But I have discovered a video that describes how to adjust the Bowden cable but unfortunately on my OM602 the adjustment but is not present at all that I can see. I was reading through and someone had implied that the OM602 engines have to be adjusted at the throttle linkage. Is this true? And if so, how would I go about doing that procedure. Thanks in advance.

STÜDZCUSTOMZ