psfred,
I will do another valve adjust as soon as I can get my wrenches back from another MB owner. I never thought about the fact that carbon would build up on the seats. It makes good sense that another adjustment would need to be done, especially if one has no idea how long it has been since the last adjustment.

On the Ford diesel- mine is an IDI from early 1994. No computer controls and has a mechanical injector pump. The engine is the kind of engine I can work on if I want to.

kweimer,
Thanks for the injector information. Have you ever heard of the seat needing to be"reamed" before reinstalling an injector? I think I have heard of a specific tool that prepares the seat for the new injector. I may be completely wrong.

Thanks again for the posts,
Doug Vazquez

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1980 Mercedes 300 SD, 215,000miles
2001 F-350 Powerstroke turbodiesel, Crewcab, 4x4, 81,000 miles
1993 Chevy Suburban, 185,000 miles