1976 Carburetor Thermal Sensor

[devo]

This is a May of 1976 carb.

The thermal sensor is new to me and I plan to delete it when I rebuild this carb. If you have experience with this year carb did you leave the sensor in place or delete it? Are the delete options a threaded plug or bolt of some sort?
The sensor is in the throttle body assembly, noticeable by the white wire.

 

[charliemeyer007]

Do the PinHead vids cover this? IMHO the early pollution controls are way more trouble than they are worth.
You take an engine that got 25 mpg and choke it down to 12 mpg and its now cleaner, only in the gubernment delusion thinking. You can borrow your way to prosperity, but sooner or later you run out of other people's money.

 

[mattressking]

Here it is straight from the manual. If you are desmogged you can eliminate. The sensor in question is 'carburetor flange temperature'. It along with all others including all other emissions equipment must be intact for it to function as designed with EGR.

 

[devo]

I dig the straight from the manual read. I don't have that. Thanks @mattressking .
So if you are refurbishing this carb do you leave the sensor or delete it with a plug, what’s the best practice?

 

[Grayscale]

Leave the sensor in place. No plug required. I wonder why someone cut the harness wire instead of pulling the connector at the sensor, but these things happen.

 

[77mustard40]

Mine's been unconnected for 14 plus years, here it is from the last rebuild a month or so ago... Edit: carb date Dec 24, 1975

 

[devo]

Great info, thanks.

I don’t know why the the harness was cut? This old Toyota mechanic has 5 carbs from 1975-1977. Only one of them has the harness intact, the others were cut?

 

[mattressking]

I’d leave it if all the wiring was intact. If no wiring intact, remove. The thermoswitch only reads base temp of carb body - there isn’t any opening behind it so no plug required.

 

[devo]

The wiring is not needed. I guess once I start messing with this thing I’ll figure some stuff out.

Right now I’m looking at the vacuum lines in @77mustard40 photo. My 2F is general market and does not have the vacuum piece in the intake manifold . I’ll have to pull vacuumed from some where else.
Is the top vacuum line for the power valve? What is the lower vacuum line for?

 

[77mustard40]

The wiring is not needed. I guess once I start messing with this thing I’ll figure some stuff out.

Right now I’m looking at the vacuum lines in @77mustard40 photo. My 2F is general market and does not have the vacuum piece in the intake manifold . I’ll have to pull vacuumed from some where else.
Is the top vacuum line for the power valve? What is the lower vacuum line for?

Top is the vac for the PV on the early 75-76 carbs, the large port from the base of the carb on the DS is blocked off on my application. There's a name for that manifold piece on the top/front of my intake but I'm having a senior moment and can't recall it... I've see them in the Classified's before

 

[Grayscale]

The manual calls it a 'gas filter' - the small double-barb (or tripple for '75) vacuum source in the manifold (gas as in air, not gasoline). The valve cover side at the base is the ported vacuum. The diaphragm on the driver's side is for the choke and goes to the gas filter in 77mustard40's pic.

The big non-vacuum tube on the driver's side is an EGR inlet (mine would collect a large quantity of fuel that would get stuck from turbulence and gravity in this passage).

 

[77mustard40]

“Gas Filter”… that’s the name I was looking for

 

[devo]

Thanks @Grayscale.

 

[devo]

I don’t think that my general market intake has an option for a gas filter? The 1FZ-FE intake has a gas filter. I wonder if it would work on a 2F?

 

[Grayscale]

You might have one of these?

OEM Carburetor Insulator for '81+ Land Cruiser FJ40 FJ60

OEM carburetor heat insulator for '81 to 87 Toyota Land Cruiser FJ40, FJ60, BJ60, HJ60. Part # 21912-61035.

www.cityracerllc.com

 

[devo]

I do have one of those and it is blocking access to my gas filter threaded port. I also have a hole saw to remedy that!

What I don’t have is a gas filter.

 

[Grayscale]

That 1981+ carb insulator has a source for manifold vacuum? It is that barb on the driver's side. Maybe you can tap into that source with a tee?

 

[devo]

Yes that barb is there, it is of larger diameter than the other vacuum ports. I actually used it at one time. T-ing off of it for vac lines to the carb. Then realized I was applying vac to some wrong places so I capped it and went back to using the ported vacuum on the carb.
The gas filter was easy to find. Toyota has them and available from 1 to 3 barbs. I like the idea of using the gas filter over the large barb on the drivers side, it’s a much cleaner look.

My next challenge may be the choke. My 1981 has the barrel adapter end on the choke cable. The ‘76 carb I think uses a set screw of types? I’ll be looking into that.

 

[Grayscale]

The choke cables both terminate as solid wire. They probably convert fine, but, if the carb has no captive barrel (like the non-USA carbs), you'll want to get a Dorman 'cable end' / 'cable stop' from the auto store.

 

[Pighead]

I needed a manifold vacuum source for the in-dash gauge, had a couple of those old "gas filters" in the junk box. They had some wire mesh or steel wool inside that seemed to affect the vacuum reading. I reamed them out with power tools, etc.