I have a 200 tdi disco with 100k on the clock that was given to me i have started to explore the old girl and find i have very little adjustment left on the tappets, after the shock on price for a recon lump i have also been advised that all she needs is a set of valve stem caps as this is a common fault for people to leave out when rebuilding the top end are these caps a short turm fix or is the a genuine fact any one had this experiance ???