You change it according to the manufactures recommendations which will be at a certain mileage.
chain.
Check the cambelt timing marks are properly aligned. Make sure you've used the right set of marks on each cam, they're different on the exhaust and inlet cams.
MOST LIKLY YOUR THERMOSTAT NEEDS CHANGING.
yes
The basic engine itself is the same L-series used in the 600, however you will need to use the 600's gearbox (because of different ratios) and diesel pump and injectors. Other than that, it should be a straight swap.
A land rover defender 110 TD5 diesel should do about 28.2 MPG on a combined cycle.
Let me guess it's a range rover 2.5 1994-2002 so it's a diesel sport edition
Yes, i believe the rover 75CDT and CDTI diesel engine (called M47R) is the very same as the BMW E46 320 diesel engine (called M47). This BMW engine was also used in the BMW E39 520 diesel car This information is available on WIKIPEDIA. Regards Tommy
on the back inside the pipe it self
Chain
Turbo Diesel 6 cyclinder
Adjust the diesel pump and diaphragm