Folks years ago somebody here posted a link to the site that deals with the problems of the 1991 through 1994 Mercedes Diesel engines (M603,M602). Just last week I rebuild the cylinder head of a 1992 300D Turbo Diesel, which was smoking pitch black clouds upon start up. Ended up being a valve guide that was completely lose, going up and down with the valve, allowing oil to drain into one of the cylinders. So I figured this week was time to do my own diesel, 1993 300SD, blue smoke in the morning only for the first 20 feet of driving, than clears up almost completely. The cylinder head is off as of last night, no obvious problem with the guides, no obvious cylinder ...1 ,2 , and 3 have more carbon built up on the pistons. I'm pretty sure that between changing the valve guides, seals, and the new head gasket that the smoke will go away..but better safe than sorry. I know there is the issue with bent connection rods, however this engine ran pretty smooth otherwise, the blue smoke in the morning is pretty much the only problem.
230K on the engine, please anybody, forward the link to the web site that deals with the issues on these Diesels (1993 M603) I wanna make sure that I don't miss anything while I'm fixing my own car :-). Martin. Autobahn Auto- posted
20 years ago