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No its mechanical indirect injection...Pre chamber swirl pots with glow plugs...
I wouldn't be able to afford a common rail rebuild let alone DIY...
The timing chains go at about 100k on some examples of the 4m40 but my engine has done double that, But you're right most timing chains last with the life of the engine..
But the bottom end is solid with decent oil pressure, So no reason not to try and fix it...
The tensioner might be at full range but it did retract and spring out fine...The engine did not run like this when I had the old head and ran the engine with the fuel bypass...
So yeah the chain or the tensioner / both might not have made the head swap transition as intact.
The top sprocket was held in place with zipties so no tooth was skipped.
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