Threads on the thermostat housing?

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KettleCarver

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Does anyone know the thread size and type on the thermostat housing where the temp sensor goes?

Thanks,

Marty
 
Stock is in the manifold and usually 3/8 NPT (5/8-18 tapered) in the US manifold, and the sensor is 5/8-18 as well, but a straight thread. I use a Dowty seal as the Smiths NPT sensors are NLA
Or heli-coil the manifold to a straight thread and use the same Dowty seal

That is not to say that the sensor is calibrated to your gauge.....................
 
Hoghead said:
Stock is in the manifold and usually 3/8 NPT (5/8-18 tapered) in the US manifold, and the sensor is 5/8-18 as well, but a straight thread. I use a Dowty seal as the Smiths NPT sensors are NLA
Or heli-coil the manifold to a straight thread and use the same Dowty seal

That is not to say that the sensor is calibrated to your gauge.....................
Click to expand...
Robert, I think stock on the Tiger was the special T piece for the heater hoses iirc.

It's an odd spot, and there are usually locations on the manifold and often many other ford applications used one on the thermostat housing.
 
My car has an Edlebrock F4B manifold. As I understand it, the heater hose is connected where the stock sensor is usually located. The sensor on my car is located in the thermostat housing.

I was doing the first start up on my freshly rebuilt engine. The temp gauge kept creeping up to 240-250 degrees, but the car was not boiling over. We used an infra-red gun to check the temp in the housing, intake and hoses, etc. The infra-red gun read 40-50 degrees cooler at the thermostat housing than the temp gauge in the dash. All of the gauges were recently rebuilt by Nossinger (sp??), in NY. The sender is new from Sunbeam Specialties.

I was thinking of screwing a temp gauge directly into the thermostat housing to see what the actual temperature is. That is why I need to know what the threads are in that port in the housing.

I would also welcome any ideas on how to get the sender and dash gauge to read accurately.
 
michael-king said:
Robert, I think stock on the Tiger was the special T piece for the heater hoses iirc.
Click to expand...
I believe that the Mk II Tigers had a "T" also, but it was not threaded for the temp sensor. On my F4B, I do not have nor need the "T" and my sensor is screwed into the top of the intake manifold.
 
MKI use 1224826 - Housing - Temperature Transmitter between the Carb spacer and the elbow fitting on the intake manifold

100_4198.jpg

Stock Tiger thermostat housings do not have a boss for the temp sender.

Mk II the temp sender was in the intake manifold

If your temp gage is reading wrong, the voltage stabilizer may need attention.

Ron Fraser
 
rfraser said:
MKI use 1224826 - Housing - Temperature Transmitter between the Carb spacer and the elbow fitting on the intake manifold

View attachment 19812
Stock Tiger thermostat housings do not have a boss for the temp sender.

Mk II the temp sender was in the intake manifold

If your temp gage is reading wrong, the voltage stabilizer may need attention.

Ron Fraser
Click to expand...
When the voltage stabilizer isn't working correctly, the fuel gauge is also affected and will read high as well. the T fitting on the engine pictured must have a ground wire attached in order for the sender to be able to "communicate" with the gauge.
Below is the location of the sender installed in an F4B intake, in this instance on my MK2 engine. You can just make it out between the distributor cap and the connector for the heater hose.

P4060842.JPG
 
rfraser said:
MKI use 1224826 - Housing - Temperature Transmitter between the Carb spacer and the elbow fitting on the intake manifold

View attachment 19812
Stock Tiger thermostat housings do not have a boss for the temp sender.

Mk II the temp sender was in the intake manifold

If your temp gage is reading wrong, the voltage stabilizer may need attention.

Ron Fraser
Click to expand...
Just to clarify then, that "T" fitting is a separate piece and not part of the intake manifold?
 
Austin Healer said:
When the voltage stabilizer isn't working correctly, the fuel gauge is also affected and will read high as well. the T fitting on the engine pictured must have a ground wire attached in order for the sender to be able to "communicate" with the gauge.
Below is the location of the sender installed in an F4B intake, in this instance on my MK2 engine. You can just make it out between the distributor cap and the connector for the heater hose.

View attachment 19813
Click to expand...
I checked the voltage stabilizer and improved the ground. My fuel gauge is not pinned and appears to be reading accurately. So I believe the stabilizer is ok.

Here is a picture of my set up. The only place I could reach with the ground wire (without cutting and splicing my new wire loom) was the screw on the distributor cap. The distributor has an aluminum housing. The temp gauge does change its reading as the car warms up, so the sender is getting a reading, just not an accurate one. Is it possible that the ground is not good enough and it is preventing the sender from reading accurately?

Sender.jpg
 
KettleCarver said:
Just to clarify then, that "T" fitting is a separate piece and not part of the intake manifold?
Click to expand...
KettleCarver said:
I checked the voltage stabilizer and improved the ground. My fuel gauge is not pinned and appears to be reading accurately. So I believe the stabilizer is ok.

Here is a picture of my set up. The only place I could reach with the ground wire (without cutting and splicing my new wire loom) was the screw on the distributor cap. The distributor has an aluminum housing. The temp gauge does change its reading as the car warms up, so the sender is getting a reading, just not an accurate one. Is it possible that the ground is not good enough and it is preventing the sender from reading accurately?

View attachment 19833
Click to expand...
The ground wouldn't be needed as the sender is self- grounded to the thermostat housing... the engine is grounded through the ground strap on the left side of the bellhousing to the disused (Alpine) transmission crossmember point.

Originally the temp sender was fit into a separate cast iron housing which was connected to the cooling system through the heater hoses (and carb preheat plate system.) As the fitting was full insulated by the rubber hoses and floating in space, it required a ground wire. There is a threaded hole for a 10-32 screw in the housing.

I have found through experience that the Alpine temp sensor will work in the Tiger and they are correctly calibrated to the gauge. (as the temp gauge is the same, Alpine or Tiger...)
 
pfreen said:
It's possible it is the wrong sender. Mine was wrong when I removed it from my Tiger.
This is an excellent reference.
http://mhartman.net/files/sunbeam/fuel & temp gauges.pdf
Click to expand...
I got a brand new sender from Sunbeam Specialties, I would hope they knew the right one to send me. That is not to say that a brand new part could not be defective.

Thanks for that reference, it looks very comprehensive. I will have to study it.
 
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