Original
part that has threaded port for thermo-vacuum advance
switch.
The
110-36 now comes with the hole plugged, for use if you
have or are recurving your distributor or replacing it
with a non USA spec unit. If you remove or disconnect the
safety valve on top of your original water outlet, it is
imperative that you recurve or replace your distributor.
See ELEC FIRING page.
This part has been redesigned to be heavier and more
resistant to cracking. A zillion of these were broken
during the cars' lives. Partly a design problem, it is
still possible to break these. Breakage is caused usually
by the thermostat slipping down out of its recess in the
thermostat housing just before you tighten the bottom
bolt. Then it is like breaking a stick over your knee.
(SNAP...). Use a little grease to help stick the
thermostat in place until you can get the water outlet
safely tightened down.
Note:
If want to keep your old distributor and thermo vacuum
valve, you will have to remove the hex plug, but removing
it will probably require drilling the plug out. Nissan
used an extremely soft metal plug (but not brass so it
wouldn't seize) with a non standard sized hex drive, and
somehow managed to apply about 5 times the necessary
torque! Would have been nice if they had just included a
loose plug with the unit for the purchaser to install but
that would have made too much sense. We made a snug
fitting drive to remove one of these and the plug just
rounded off internally.
You're
on your own if housing breaks while you are trying to
remove plug. In my younger days I would have just removed
these one way or another myself, now I'd rather go play
soccer with my dog.