If it has the 19j Turbo diesel engine fitted, it aint a defender its a 90 or a 110.
Defenders are post '93
Rot. Chassis rot from inside out. Front bit seems to last due to oil leaks.
Crossmembers all rot, not just rear. Body mounts rot. outriggers rot. Tank riggers rot. Fuel tanks rot.
Spring mounts rot. Front shock towers rot.
Bulkheads rot for fun, corners, posts and footwells.
The hotspots in the cylinder head come loose and wreck the block/ pistons. The heads crack across the valves. The injctor pipes crack. The piston crowns crack. The piston crowns melt.
The front diff wears faster then the rear. The hub drive fanges wear for fun. Especially if the little rubber oil cap rots or cracks.
The UJ's on both props wear. The cv joints wear, the swivel bearings wear, the swivels go out of lash causing violent steering judder above 50 mph
These models are fitted with the LT77 gearbox. Mainshaft and layshaft bearings are weak. the wrong grade of EP90 rots the synchro hubs (low sulfur gl5 ep 90 is needed i think -its been ages since i owned one , sorry)The splines on the rear output shaft fail due to lack of lubrication. Transfer boxes are tough but selectors can seize if ot used often.
Why would you buy one if you dont know what your doing with them, i can strip & rebuild them in my sleep, but i'll never own another.