This is why I suggested checking the crank pulley NOW.

The AAZ timing belt is so easy to do properly. The only special tools you need are the camshaft lock and the dial gauge to set the injection pump. A 13mm (IIRC) is the proper size for the injection pump pulley lock pin.

-J

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.