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Flex!
That is indeed a difficult bolt to access -- so difficult that when the dealer did the trap cat recall on my '87 300D (they replaced the turbo as part of the recall -- it was damaged) the mechanic didn't put that lower bolt back! It eventually caused a leak and damaged the o-ring. I fixed it myself, no longer trusting them. Anyway, I used a number of socket adapters to create a curved tool that would reach the hidden bolt.
As the pictures show, I used a 3/8" ratchet, extension, and swivel to a 3/8" to 1/4" wobble adapter and finally a 1/4" deep socket. I had to put the socket on the bolt with one hand and then thread the extensions through the space and plug it into the socket -- I couldn't get the entire assembly into place when it was all put together. A PITA but it finally worked.
Jeremy
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"Buster" in the '95
Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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