Hi.
I don't think it is seized, but probably needs to see the Doctor.
Since buying the Disco I have had nothing but trouble. Engine overheated and seized 500km after buying it. (More than likely my fault) Bought a second hand engine that was problematic from the word go. As I was due back at work the next day, we had to drive it 800 km's. There was diesel getting into the sump, and I had to change the oil every 100km's, and no guts whatsoever. When I got back home I have stripped it. It appears that they used the wrong size head gasket, and all piston crowns were badly marked where the valves were hitting them. The injectors were also hitting the points in the combustion chamber, so I am guessing that the injectors are all stuffed, and that is how the diesel was getting into the block.
It all turned pear shaped when the cam shaft bolt snapped and the cam stopped turning. How it made it that far is still a testament to the resilience of a 300 tdi.
So I am busy rebuilding it now, but as I live a 30 minute flight from anything resembling a spares shop, and things not quite going to plan, it is tough going.
Just discovered that the pistons that I imported are the standard size, but way too small.
Back to the drawing board....
Cheers
Drew