Happened to my 83sd.
Only difference is I had a 3 piece camshaft then

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1983 300sd 150,000 miles on her (wifes)
1997 dodge ram 2500 cummins turbo diesel 550rwhp with a set of twins ready to go on.
2005 Audi A6 2.7T Sline Quattro
1998 30' Four Winds