Still trying to find
Join Date: Jun 2011
Location: United Kingdom
Inside the Twin Spark Thermostat
Decided to open an old thermostat i had lying around to use as a purpose made cooling system flush housing when i will flush the system in the future.
Firstly i used a junior hacksaw and cut around the circumference of where the plastic outlet pipe is crimped into the thermostat aluminium body.
a few love taps and the thermostat popped out of the casing along with the plastic outlet tube.
The thermostat is sprung loaded onto the plastic outlet tube to create the seal, you will notice that the brass cork stop like object (the thermostat itself) has a pin shaft that is inserted into the thermostat, in the plastic outlet tube is a shaft stop in which the other end of the pin rests. As the items are assembled, there is no movement in the shaft in between the thermostat and the shaft stop inside the plastic tube.
As the coolant gets up to temperature (88 degC), the wax (or compound) inside the brass thermostat expands and forces the shaft to extend outwards (EDIT: as the temperature rises, the thermostat gradually opens until it is fully open at 88degC), this opens the liquid tight seal in between the thermostat and the plastic outlet housing, against the spring tension the force of the shaft being pushed out by the expanding wax inside the thermostat, it overcomes the spring tension as it gradually gets hotter.
thank you for reading.
please leave any comment or corrections to this post.
Last edited by Chris_gta; 28-08-13 at 17:48.