Anyone care to guess what might cause this? There is a 240D for sale in my region that has sheared all 6 (!) bolts on the crank pulley. The seller claims he has no idea why they sheared, just that a shop told him that's what happened. Seized water pump? I wonder what else might be damaged?

Thanks in advance!

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1992 300D 2.5T
1980 Euro 300D (sadly, sold)
1998 Jetta TDI, 132K "Rudy"
1974 Triumph TR6
1999 Saab 9-5 wagon (wife's)