Personally I've always used cold as it's stable, if set hot it's cooling
down all the while, although I've no idea what practical difference that
makes. It does help the hands if doing it in the winter, but then I do mine
in warmer weather anyway. It also depends on whether you are simply
checking them, or having to adjust them, the latter can take significantly
longer hence the cooling will be greater.
One time when you should definitely *not* do it hot is if you remove the
plugs to make turning the engine easier and have an alloy head, as that can
bugger the threads.
PaulH.
----- Original Message -----
> The specification page on my Haynes manual gives two numbers for the valve
> clearance: 0.015" cold and 0.013" hot. On my '80 B, I have been setting
> the
> valves hot for the past 20 years/70k miles. How much difference would it
> actually make if I set the cold?
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