Dear friends, I am new on this forum. I have recently purchased a 1997 Range Rover with the BMW 2.5 diesel engine (M51). Everything works and the car runs like a dream, apart from one problem. When the car has been standing overnight and I pull away and accelerate from a cold start, there is a tapping sound under the hood. This sound disappears after a few kilometers when the engine becomes warm. Any suggestions will be appreciated. Thanks.