You'd have to have a healthy belt *really* dang tight to cause its failure that quickly. It may have been about to go and the extra tension finished it off.

If this is a 123 we're talking about... why didn't it have two on it?

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'82 300CD
"Pearl", the very first turbo diesel 123 coupe
Totaled 11/23/18, rebuild in progress.
'85 300TD, "Artemis".
'78 300D euro, "Ol' Red", mostly retired.
'85 300D, "Gandalf".