IMHO Timing Chain and Chain Tensioner if you haven't already replaced these items. Having BT 300K+ in my old W123, I was sure it was indestructible until that fateful day, sitting at a red light, the light turned green, I hit the pedal, the car moved 20 or so feet and died. What??? Diesels don't quit unless their out of fuel... Had to hop out and push it across the intersection. Opening the oil cap confirmed my horror, timing chain piled up around the cam sprocket. I think I was around 320K when it let go.
I guess I got lucky, I only lost the cam and cam towers, no bent valves. Got those broken parts used from PGAuto as a matched set. The mechanic that put it all back together said he though the Chain Tensioner was the component to fail. He also said the bottom end crank and bearings looked like new.
Just my .02
Mark
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1987 300DT 127K
1987 300TDT 283K (Sold)
1999 528iTa 75K
1991 300D 2.5T 214K - Dead Tranny
1984 300DT 375K (Sold)
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