Most of the rod operated systems use the middle right tap, the top right is
smaller overall and has a smaller taper, earlier version methinks,
All shown right are BSP, left are UNF the bottom left from a MKVII I recall.
The rod is bifurcated and fits over the flat sections of the tap and held with a split pin, Would the MKV be different?
So apparently all Mark VII, VIII and IX had the remote control rod.
Funny they went away from it on Mark V after building 1025 cars, but then brought it back again on Mark VII.
I love it when I can learn something new.
Here is how it is shown in the Mark VIII SPC.
Yes split pin through rod and valve. The bottom tap was removed from a 73 XJ but is common to all saloons. If C 5755 is still quoted for the later 60s /`70s saloons then conformation,
if not then perhaps C5755 is the smaller (top) of the two.
Yes all on the left are block drains. Re the other thread on this subject I wrongly assumed
that all drain taps, be they block or rad, are BSP, the industry standard for these items,
but ,as Mike Spoelker correctly points out, the block drains are 1/2" UNF.
Why so !! manufacturing efficiency ? As is known the oil gallery bungs are 1/2" UNF, so
rather than another tap (BSP) on the transfer machine, or whatever, just use the 1/2"UNF.