tcslr Posted July 30, 2013 Share Posted July 30, 2013 The thermocouple is not reading in my Chrysler. Clearly, I see how to remove it from the block. Short of unscrewing the entire gauge from the dash, how is the lead removed? see the attached photo. I tried to loosen it with my fingers but it only moves a small amount. I don't want to jam or break anything.And any good suggestions for someone to repair? Thank you. Tom Link to comment Share on other sites More sharing options...
F&J Posted July 30, 2013 Share Posted July 30, 2013 It is not meant to be removed. A new gauge from the car maker would have come assembled that way. There are gauge restoration places that can repair these.Try google for temprature gauge restoration, etc Link to comment Share on other sites More sharing options...
28 Chrysler Posted August 1, 2013 Share Posted August 1, 2013 There is a way to repair the temp gauge, (it is not easy)1. You will need to buy a new aftermarket gauge that will fit your engine.2. Put the bulb into something like dry ice.3. Cut both tubes close to the gauge and solder the new tube on while the bulb is still subject to extreme cold.The hardest part is not plugging the tube with solder. Link to comment Share on other sites More sharing options...
hddennis Posted August 1, 2013 Share Posted August 1, 2013 There is a way to repair the temp gauge, (it is not easy)1. You will need to buy a new aftermarket gauge that will fit your engine.2. Put the bulb into something like dry ice.3. Cut both tubes close to the gauge and solder the new tube on while the bulb is still subject to extreme cold.The hardest part is not plugging the tube with solder. Tom, here's the restoration of a gauge step by step: 1933 Plymouth Temperature Gauge Repair Howard Dennis Link to comment Share on other sites More sharing options...
joe_padavano Posted August 3, 2013 Share Posted August 3, 2013 The thermocouple is not reading in my Chrysler. To clarify, that isn't a theromcouple. A thermocouple is a semiconductor that changes voltage with temperature. This is a mechanical bulb style gauge that uses a working fluid like ammonia or alcohol in a sealed tube. Heat expands the working fluid, moving the gauge. The link above provides excellent information on how this works and possible repair. Link to comment Share on other sites More sharing options...
Friartuck Posted August 4, 2013 Share Posted August 4, 2013 (edited) I tried to repair my gauge as described above and failed. I then sent it out to Roy Martin, The Temp Gauge Guy in VT, cost was about $100 in 2008:Vermont Automobile Enthusiasts (Classic and Antique Car Club) Articles Edited August 4, 2013 by Friartuck (see edit history) Link to comment Share on other sites More sharing options...
tcslr Posted August 8, 2013 Author Share Posted August 8, 2013 Thanks to all. I looked into the repair. the capillary tube was a .065OD and the smallest ID I found was .08. I cosidered using foil shim. I attempted to find out what fluid was in the new sacrifical unit - no avail.The folks in the technical departmetn ( of the potential replacement unit) mentioned Williamson Instruments in AR. So - I'm trying that out.Anxious to see how it turns out. Thanks, Tom Link to comment Share on other sites More sharing options...
Beltfed Posted August 11, 2013 Share Posted August 11, 2013 Joe-padavano, Not to be a nitpicker, but a thermocouple is not a semiconductor. They are made by joining two dissimilar metals together. They produce an EMF, but almost no current with temperature. You might be thinking of a thermistors. Link to comment Share on other sites More sharing options...
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