Carburetor Spacer Ports....
- Thread starter echodelta
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Not sure what that port is. Normally that would be the input for the carb heater, but there's no exit port on the other side. If you blow into it with a hose, does air escape anywhere else?
How is your hash pipe (temp sensor body) connected?
-Kevin
How is your hash pipe (temp sensor body) connected?
-Kevin
Carb Spacer Plate
If one of the ports is open to the intake chamber, the other one probably is too. Would not make sense to have a water inlet without a water outlet, but this is the first one like this I have seen.
They both are probably for vacuum take offs. One could be used for vacuum powered brakes and the other for the positive crankcase valve (PCV), which pulls fumes from top of the head and burns them in the engine.
If one of the ports is open to the intake chamber, the other one probably is too. Would not make sense to have a water inlet without a water outlet, but this is the first one like this I have seen.
They both are probably for vacuum take offs. One could be used for vacuum powered brakes and the other for the positive crankcase valve (PCV), which pulls fumes from top of the head and burns them in the engine.
Do Not Leave Vacuum Ports Open
If these are vacuum ports, do not leave either open to the atmosphere. If you are not hooking up your brake booster or PCV, find something to plug the two nipples. Otherwise, it would be a very large vacuum leak to your engine and your engine would not run correctly.
If these are vacuum ports, do not leave either open to the atmosphere. If you are not hooking up your brake booster or PCV, find something to plug the two nipples. Otherwise, it would be a very large vacuum leak to your engine and your engine would not run correctly.
J D Johnson
Silver forum user
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No reason at all. I'll bet that open "port" is a water nipple and its mate (on the opposite upper corner) is either corroded, or broken off.
Is There Something on the Other Side?
J.D. is right, if there used to be a nipple on the other (unseen) side of the carb spacer plate. Is there anything on the other side of the plate - on the side away from the two nipples shown? If there is, then the uncapped nipple would be for water as would the other (missing?) nipple.
Looking at the photo closer, there is a hose by the green cap on the one nipple. Is that the vacuum hose going to the brake booster? If so, then it would make sense to connect it up to the nipple with the green cap.
One caveat - if there was a water nipple that corroded away, it is possible (not likely) that the water jacket inside the plate has corrosion, too. If any of that corrosion made it all the through on the bottom of the plate, it could be a vacuum leak for the engine. If it were me, I would plug off it AND where the missing nipple is, just in case. It does not hurt anything to plug it off if you are not using it and might save you headaches down the road when you are trying to find the source of a future vacuum leak to the engine.
If you see no signs of corrosion inside the spacer plate and the missing nipple was just broken off, then there is no reason to plug off the water ports.
J.D. is right, if there used to be a nipple on the other (unseen) side of the carb spacer plate. Is there anything on the other side of the plate - on the side away from the two nipples shown? If there is, then the uncapped nipple would be for water as would the other (missing?) nipple.
Looking at the photo closer, there is a hose by the green cap on the one nipple. Is that the vacuum hose going to the brake booster? If so, then it would make sense to connect it up to the nipple with the green cap.
One caveat - if there was a water nipple that corroded away, it is possible (not likely) that the water jacket inside the plate has corrosion, too. If any of that corrosion made it all the through on the bottom of the plate, it could be a vacuum leak for the engine. If it were me, I would plug off it AND where the missing nipple is, just in case. It does not hurt anything to plug it off if you are not using it and might save you headaches down the road when you are trying to find the source of a future vacuum leak to the engine.
If you see no signs of corrosion inside the spacer plate and the missing nipple was just broken off, then there is no reason to plug off the water ports.
New Photo
Here's a new view with the big picture.
I was wrong on my first post, there is a port on the forward side
of the carb spacer, not worn out or anything, just a flat hole,
plus the two ports on the firewall side, one open, one with the green cap.
The car seems to run fine with this exact configuration.
I had the carb rebuilt and this is what I saw. Should I do anything? Thanks!
Here's a new view with the big picture.
I was wrong on my first post, there is a port on the forward side
of the carb spacer, not worn out or anything, just a flat hole,
plus the two ports on the firewall side, one open, one with the green cap.
The car seems to run fine with this exact configuration.
I had the carb rebuilt and this is what I saw. Should I do anything? Thanks!
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Ding,ding,ding! JD wins a prize for the correct answer. There was an outlet port for the carb heat that looks like it was removed. The removed outlet would go to your hash-pipe (temp sender). It appears that the T that feeds the heater core bypasses the spacer completely. I cant really understand the reasoning for heating up the base anyway - other than to help boil the fuel in your float bowl on a hot day.
I don't think you need to do anything other than re-install with a new base gasket. Make sure to put a fresh cap on the vacuum port too if you aren't using it.
Cheers, -Kevin
I don't think you need to do anything other than re-install with a new base gasket. Make sure to put a fresh cap on the vacuum port too if you aren't using it.
Cheers, -Kevin