I am going on the assumption that this is an interference engine. I cannot imagine in my wildest dreams that any diesel could not be interference since the combustion chamber must be so small.
If it is, I think it is foolish not to change the timing belt near the recommended intervals. The consequences of breakage is just to severe. It's just not worth the gamble.
I always thought it to be ironic to see the non interference belted engines such as the old Ford 4 cylinder had the easiest to change belts. It's the ones with dire consequences upon failure that are always the most difficult to change.
My $0.02,
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