Any idea what these plastic petcock looking things are on my thermostat housing? Should I cap them? They look like a point of failure.
Any idea what these plastic petcock looking things are on my thermostat housing? Should I cap them? They look like a point of failure.
- Thread starter Landlover12
- Start date
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They're temperature controlled vacuum switches - the coolant temps opens and closes the valves for the vacuum.
Mostly used for the emissions control stuff which appears to be since removed, although the charcoal canister is usually nice to keep.
Mostly used for the emissions control stuff which appears to be since removed, although the charcoal canister is usually nice to keep.
i think there called :
Bimetal Vacuum Switching Valve...it's basically a valve that
opens and closes at a set coolant temperature. When the engine warms up, it opens up and purges the
vapors stored in the charcoal canister into the intake, where they get burned in the combustion chamber.
www.supraforums.com
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OR .............
This is what happens when uppers and lowers come to the Rising Sun Mechanical THERMOSTAT HOUSING HOSPITAL .....
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Miracles do Happen ......
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Bimetal Vacuum Switching Valve...it's basically a valve that
opens and closes at a set coolant temperature. When the engine warms up, it opens up and purges the
vapors stored in the charcoal canister into the intake, where they get burned in the combustion chamber.
What is BVSV?
I broke off the 2 vacuum lines from the BVSV during my headgasket saga: http://www.playerviolin.com/misc/bvsv.jpg what does BVSV stand for? and where can I get one -- is it a dealer item? (if it's expensive I'll just fix this one) Thanks! Fred
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/
.
OR .............
This is what happens when uppers and lowers come to the Rising Sun Mechanical THERMOSTAT HOUSING HOSPITAL .....
/
Miracles do Happen ......
.
Last edited:
- Thread starter
- #4
Anyone have photos of a how this is hooked up properly? Any point in me putting the emissions control stuff back in? Also. What is it?
Bear
SILVER Star
You're blessed if your state doesn't require the emissions spaghetti falderal that goes with those vacuum switches !
- Thread starter
- #7
1978
- Thread starter
- #8
1978
Take a look at this and decide if you really want to go down that road...
Post in thread '78' 40 vacuum diagram??' 78' 40 vacuum diagram?? - https://forum.ih8mud.com/threads/78-40-vacuum-diagram.533002/post-7100635
Post in thread '78' 40 vacuum diagram??' 78' 40 vacuum diagram?? - https://forum.ih8mud.com/threads/78-40-vacuum-diagram.533002/post-7100635
You can easily connect up the charcoal can using the VCV and brown BVSV. That is how my 3FE is set up in my 40 to vent the fuel tank. The 2f I think also vented the carb float bowl to the charcoal can but that requires the outer vent control valve and emissions computer. No float bowl on the 3FE.
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