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Posted by D. Sherman on Sunday, January 27, 2008 at 00:31:46 :
In Reply to: Re: Military vs civilian temp sender posted by Vaughn on Saturday, January 26, 2008 at 20:06:06 :
The sender was definitely military, with original military packaging, the NSN as I mentioned, and rubber military wiring connector on it. I looked up the NSN info and it states the voltage as 24 volts. I don't know that the "12-V" stamped on the sender body really means "12 volt". It could be something else. I asked the guy if they're all the same for all M-series trucks and he said yes, except for the difference between metal-shell and rubber-shell connectors. If this one with the 1/2" pipe thread fits my big trucks, I'll keep it as a spare.
What you say makes sense about my pipe adapter idea causing a hot spot, and about not drilling out the head. A 1/2 pipe fitting actually takes about a 3/4" dia hole, once it's tapped, which might even be so big that it would make the head crack. I will try to find the right one.
As for the seals, they were rubber seals (inner front Rockwell axle seals), packed in cosmoline with a cure date of 1950-something. They were a rather crude design, compared to modern seals. They felt hard to the touch when I put them in, and they leaked immediately. I did put sealer around the outside of them when installing them in the carrier, and around the carrier when installing it in the axle tube. I'm sure they were simply too old. Memphis should stop selling them and throw them out. Now that I found a modern equivalent that I can get from a regular bearing house, that's what I'll go with as needed in the future. Plus, the modern one rides at a slightly different spot on the shaft, which is good for cases where the shaft is getting scored.
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