2nd Gen Non-Engine/Transmission Broke my yellow EGT wire--need answers PLZ

[Sky]

I was putting on my exhaust blanket and putting my EGT probe back in to the manifold and tightening it down and I broke the yellow wire about a inch above the steel braided line and needless to say my gauge doesn't work anymore. Can this be soderd (spelling?) back together? How can I fix this? Or do I have to get new wireing?



Mike

 

[Extreme1]

The manufacturers of stuff I've used on sleds recommend using crimp connectors. I don't know the details why though.

 

[WestTN]

answer plz

This is a thermocouple wire. You can crimp both ends in the same end of a butt splice without introducing dissimilar metyals errors or any other any problems. Since it is that close to the manifold I would remove the plastic outer layer of the splice first. It wasn't meant for those high manifold temperatures.

 

[illflem]

Originally posted by Extreme1

The manufacturers of stuff I've used on sleds recommend using crimp connectors. I don't know the details why though.

The reason for crimp over solder is that unless the solder joint is sealed airtight the wire can corrode and break right at the joint due to the solder resin. Just regular heat shrink tubing won't cut it, it has to be the type that also contains a sealent.

 

[HEMI®Dart]

I think Sky read the same thing I did once. Some EGT gauge manufactures say if the wire is broken, replace the entire length wire. Something to do the the accuracy of the gauge if the wire is shortened? My Autometer EGT gauge directions said not to cut the yellow wire, even if it is too long.

 

[Peter Campbell]

As long as the two or more intermediate juctions are at the same temperature it should not affect the reading ( rule of intermediate metals). for example: in the consantin to solder junction the solder to copper junction the coper to solder junction and the solder to constantin junction. All those junctions are in the crimp on butt splice. Of course the resistance should be the same- that is not normally a problem. Soldering the two broken ends together would work also- constantin to solder- solder to constantin. Not that the metal is constantin- there are four or so alloys commonly used. The resistance and accuracy can be affected. It will be more succeptible to corrosion and inaccuracies building in. Dont change the resistance- and it should still be accurate. Plan on anothe probe in a while - sooner the more you are worried about accuracy.

 

[RustyJC]

Most of the thermocouples used for these temperature ranges are Type K - chromel/alumel.



Rusty

 

[Peter Campbell]

I thought there was another common pair. But did not remember the name. Thanks.

 

[C Schomer]

I usually twist the ends together tightly, then solder. The ends MUST have a good mechanical connection - the solder just keeps them that way. If you use one end of a butt connector - make sure the wires get smashed together and not spread apart. Craig