Here's something interesting I found concerning EHA's.

"According to the web page maintained by Mercedes owner in Japan, he has disassembled several broken EHA's and found that there are two valve settings, one is 6 and 1/2 turns back from the end, and another is 5 and 3/4 turns. Just try both before buying new one."

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1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible