Hi Mike, Don't know if this helps but I had similar problem with an 2005 Jag v8. The timing chain rattled during warm up. Turned out to be the variable vale timing components (covered during warranty period). I mention this because I believe your engine was designed by Ford and made in the UK at their Wales production facility. This is the same plant that the Ford owned 05 Jag v8 came from. I know Ford liked to use its parts in Volvo and Jaguar cars during their ownership of these companies. Some thing to consider.
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