Hi Mark,
This is a long shot but worth checking if all else fails.
The hydraulic timing chain tensioner on these engines relys on oil pressure to work And it is possable if the engine is stalled in gear for the crank to turn backwards enough to snatch on the chain tensioner causing a momentary slackness which allows the chain to jump on the distributor pump sprocket.
It will jump one or two teeth, enough to stop it running.
I have only heard of this happening twice on an Iveco 4x4 usually caused by starting the engine in gear and dumping the clutch before it's got up momentum resulting in a stall.
I have not heard of the cam sprocket jumping so your valve gear will be OK. It's just a case or removing the chain covers and refitting the chain to the correct timing.
I have fitted a manual tensioner to mine to overcome this but I think if your careful with your clutch the standard set up is just fine.
I hope this helps
Best of luck,
Andy
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