The EGR fitting was too rusty to reuse, and its threads stripped when I removed it from the manifold. So since I don't have & can't find a tap that fits it, I had to make the new fitting a thread-chaser. I ran the old fitting in several times to break up the rust in the manifold threads, then the new one, before installing it & the EGR pipe with Nickel anti-seize.
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Owner caption March 2020 · Photo 104 of 157