Wilf,
How far are you from Simon? He sounds as if he is really getting frustrated and you know how these things can do that. Then someone else comes along that hasn't listened to it and gotten stuck on a certain train of thought and they quickly point out something obvious that you are overlooking. I have had this happen to me several times and then I felt like a fool for not noticing what the real problem was.
Ron
Simon,
Don't give up yet. That comes when you replace the engine with a brand new one and still have the knock.
