My 1985 300D-T came with a tapped hole...
...in the exhaust manifold. See the pictures I posted in the following thread:
Where's the boost???
If yours does not have such a thing (unique to California version w/trap ox?), you will have to do the drill/tap thing. Some posters here have suggested that coating the drill and tap with heavy grease will trap the chips and keep them out of the manifold but I would be leery of trusting in such a scheme. The only other alternative would be to pull the manifold.
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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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