Andy,
You do mean .012", i.e., twelve one-thousandths, don't you?
Bud Krueger
52TD
Andrew Moyce wrote:
> I got my engine back together with new tappets and one new pushrod.
> For those who have forgotten the drama it all started with a tapping
> noise at a rate about half the rpm, which was increasing in volume. I
> found that the tip of one of the pushrods had separated, acting like
> a metal golf tee riding free in the shaft of the rod, which was the
> apparent source of the noise. I also found significant pitting and
> wear in my tappets, especially those on the 1 and 4 cylinders, so I
> replaced them all. In discussion with Darryl, the engine rebuilder
> it looks like the tappets aren't rotating in their sockets so they
> wear in one place. He attributes this to crank design and there
> doesn't seem to be a remedy other than to change the tappets every
> 12,000 miles or so (mine had 18,000.)
> Anyway, got it all back together and adjusted the valves to .0013
> cold and it started right up. I wouldn't compare the sound to a BMW
> motorcycle, but the tapping is gone. After warm up I reset them
> to .0012.
> Took a test drive . . . about 20 miles and it ran just fine, though
> with a little gearbox noise under load, which in the past has meant
> that the timing is a little retarded.
> A few blocks from home it started hesitating and missing and we
> limped home. I haven't had time to investigate, other than to check
> that all the spark plug wires are in place. Next step, when I have
> time, will be to recheck the valve clearances, set the timing and
> check the carbs and ignition. I'll examine the spark plugs for
> abnormal soot or whatever. There is a nagging fear of a burnt valve
> or some major problem, but I guess I'll discover that as I go.
>
> Any suggestions?
>
> Andy Moyce
> 52 TD
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