My son has a 2001 Land Rover discovery with the 4.0 L engine and it's sitting at my shop with a blown cylinder liner. Apparently the engine is aluminum with steel liners and after about 65-70,000 miles the liners, after many heat and cool cycles, will start moving up and down till the seal blows and coolant inters the cylinder causing a overheating problem. The fix is to pull the engine have all the block bores re sized and new steel liners pressed in. Then the heads have to be counter bored to accept a new sealing cap to keep the new liners from moving. Very pricey so I hope they have a better engine design now