The radiator and intercooler etc etc all stay in place - you don't disturb any of the engines "sytems" or loose any oil / coolant
The washer bottle, electrical,and mechanical fans, the fan shroud, airbox, "fan belt" and harmonic damper need to come off to give you access to the two piece plastic timing cover.
YOu need to unplug the air mass sensor and temperature sensor on the airbox, the washer bottle pump and the electric fan ( which is buried in the shroud )
Once the shroud and fans are off there's actually heaps of space ( about the same as the standard petrol engined installation ) to work.
A mirror on a stick is usefull for viewing the alignment of the common rail high pressure pump and crank timing marks without too much head twisting - but not essential. I didn't use one, but would have if it was handy.
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It seemed like a good idea at the time........
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