What is this for?

[jvazquez53]

This, whatever it is, is located in the bottom part of the thermostat bowl, is disconnected and there is no thermostat. I am thinking that I'm going to to remove it and use the hole for a temperature sending unit (an extra one).

 

[effjay60]

that is a bi-metal vacuum control valve I be thinks. Obviously you are desmoged. there is two from the factory. One is for the evap system? and the other for heat riser?? I dunno, I retained the evap one after my desmog and did like you said and ditched the other in favor of a mechanical temp probe.

 

[Butt Ugly Chuck]

That's the remains of a Bimetal Vacuum Switching Valve (BVSV). In stock configuration, it has a vacuum source from the advancer port of the carb. It is supposed to remained closed till the engine warms up some (fsm says 111 degrees F). When it opens, it allows vacuum from the advancer port to the main vacuum advance diaphram of the distrubutor.

There's another BVSV underneath and behind that one that controls vacuum to the choke opener.

Hope that helps,
Butt

Edit: Sorry, posted in too big a hurry. The BVSV's have multiple purposes: advance system on distributor as above, controls flow of evaporated fuel into intake manifold as effjay60 eludes to, control of EGR vacuum, and the choke opener, maybe even more if I dig deeper into the FSM. I gotta go to work now though. Sorry for the rushed post!

Later,
Butt

 

[Joe_E]

I think the bigger question is what the H is that picture of ?!
Looks like you ran over an I.E.D.

 

[jvazquez53]

Good! It will be removed and replaced with a H2O sending unit, since I don't have a T-stat, that will be a perfect place.

 

[MarcoPolo]

How about the housing for the t-stat? Am I seeing the bolt there because of a piece broken off?

 

[jvazquez53]

How about the housing for the t-stat? Am I seeing the bolt there because of a piece broken off?

No leaks... a little amount of epoxy filler and problem solved.