I picked up a cap from a independent shop that carrys MBZ parts today it is a 100 the one that was on it had a black alum sticker covering the whole cap and was marked 140 peeling the sticker back and it says 120 I am thinking this is the presure of the cap maybe it is located on one of the little round handles.I think it is the egr valve located on the very top and feeds in to the intake runner must be okay to disconect I know a lot of the TDI guys do it. Okay I did not relize this engine could rev that high I am used to my truck and never take it over 3000 most of the time its 2800.Thats about what it looked like for rpm at sixty five.

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89 Ford F3504x4CC 7.3 IDI turboed Intercooler and running on wvo now powered by a 1997 Cumins
87 300SDL on bio and wvo killed by chevy truck 5-24-06
1999 E300TD black with gray int.