THERMOSTAT REPLACEMENT /
MODIFICATION
This
modification allows one to replace the original thermostat with a modern type.
The
thermostat sleeves dimensions and structure are as
follows:
Material:-������� Brass.
Outside
sleeve:-
1⅝" long, x 2-5/16" external diameter, (or such that is
a snug fit into your thermostat housing).� Internal diameter,��
1-15/16" one end, and 2-1/8", plus .010" the other end.
The step should be situated about ⅝" from the narrow� end.
Internal
sleeve:-
1"
long, minus the thickness of the thermostat body flange, x 2-1/8"
diameter, minus .005" (or slightly greater) to allow a snug clearance fit
into the outer sleeve, x
1-5/16"I.D.
Both
sleeves when fitted together with the thermostat in place must be the same
length so that when they are fitted into the thermostat housing the ends are
flush with the face of the thermostat housing.�
It can be a bit fiddly to get to this stage but it must be done,
otherwise you will have a loose sleeve flopping about in there.
When
you have both sleeves the same length with the thermostat in place carefully
drill a hole through both sleeves, 7/32" in diameter, directly under the
bolt (3/16"W.) that locates the original type thermostat in place, so that
when the 3/16" bolt is screwed into place it locates both sleeves into
position and stops them moving about.
DO
NOT DRILL ANY HOLE THAT WILL FIT OVER THE BYPASS.� Make sure your thermostat has a relief hole
in the body flange.� If it doesn't, drill
a 3/16" hole in the flange, being careful not to interfere with the
thermostat flange, and make sure it is not obstructed by the sleeves.
See
technical drawing below
Ken
Gardiner