I recently had my M40 valvetrain overhauled, new cam, belt, followers, and
lifters. Basically, it needed to be done as it refused to rev over 5250 RPM
and was rattling like a skeleton in a biscuit tin. Unfortunately, I hadn't
time to do the work myself, so I entrusted it to an old family friend of my
GF who runs his own repair business.
I got the car back, it revs to around 6300 or so (never dared take my eyes
off the road to be more exact!) and is definitely much sharper, but anything
above idle speed and the dam thing still rattles. Not as much as it used to,
but it's there. So the question is, should it still do this? I don't think
it should, but before I go down there and start moaning, I would like some
sort of feedback of other peoples' experiences on this. TIA.