Im led to believe to take the sump off in the CRD you need the gearbox out, had an oil leak from my timing cover years ago probly one of the first CRDs to have this and Emerald Nissan struggled with fixing it had the car for 2 weeks or more had the gearbox out multiple times trying to locate the leak.Thanks all, so far it's only done it once to this week so I'm putting it down to the cold weather and not being run much for two weeks.
Last two days it has been good and no leak seen.
Will keep an eye on it.
Spoke to two mechanics today.
One said the engine would have to come out, flywheel off, head off and sandwich plate off then start the rebuild with a new gasket.
Second one said don't need to pull the engine out, just strip the front off and new gasket. Then reassemble. I asked about taking the sump off and can you remove the sumo without taking out the gearbox and he said you can on a common rail, but I'm reading this is not the case?
I'll keep an eye on it for now..