Thanks WEE.

Nobody in northern CA seems to know anything about
the purge so I had to order it
from San Diego.

Meantime, I got on with #2 and adjusted the
valves. Interestingly, 3 of the 4
exhaust valves were right on target - 0.3mm. The
4th was 0.2 mm. One of the
inlet valves was 0.1mm. The other 3 inlets had no
clearance at all. - Phew!  However,
they had not been adjusted for about 10 years -
yeah, I know :-(

Now I have the IP problem again - the peeing
manual pump (MP).
I had to remove the complete fuel pump (FP) to
replace the MP*. About a pint of oil drained out
and getting the connection on the IP cleaned up
and the gasket scraped off was an unpleasant 2
hours of work. I disconnected the output fuel line
just at the fuel pump and the inlet fuel line
right after the inline filter, and then removed
the FP.
Removing the old MP and replacing it was then very
easy.

I then had a look into the fuel-out line of the
pump. It has a dinky little delivery valve
under a collar -  the manual calls it a holder.
This holder is a tube of about 1/2" diameter and
1/2" tall.   A gap of about 1/4" wide is cut along
the length of this collar. I'm curious to know the
reason for this construction. When the pipe
connection from the outlet line is threaded down
into place it goes down outside this collar. The
gap in the collar could be facing any direction -
for example, it could be facing the inlet port of
the incoming fuel or facing in the opposite
direction. There seems to be no way to hold it
facing the inlet port, which seems to be the most
logical direction for it to face.
Enlightenment here would be appreciated.

*This was a typical example of manufacturers
minimizing the materials and crowding
the componments so close together that, for
maintenance or repair, the time and cost are far
higher. One small change at the base of that FP
would allow a wrench to reach the MP, so it could
be replaced in a matter of a few minutes. Does any
manufacturer pay attention to maintenance and
repair tasks?

TIA