Thanks for the replies. Yes I am probably being paranoid, age tends to do that I guess. being stuck on the side of the road at our age is not something to look forward too. Anyway there is a lot of rattle at start up and still there at idle, Ford dealer tells me this is an interference engine so if the chain goes so does a lot of other stuff. There's a cost to peace of mind and I'm willing to bear it. I just want to pull my little Aliner hassle free and enjoy the road for awhile longer.
Thanks again.
P.S. I dought I'll live long enough to see 370000 on it.