Ok. So the threads were screwed up on the sending unit. I tried to fix and rethread but only made it worse. Anyone know if there are other units that will work on this 317 lyb? It has a 1/2" npt thread. Or can I use an adapter for a unit with a 1/8" thread to get it to fit into the half inch hole?

Brad
Sierra Vista Arizona
1954 Lincoln Capri

½” NPT sounds too big for an oil sending unit hole in the block.  I do not have a LYB block sitting here to look at, but I would think the threaded oil pressure hole on the LYB would be ¼” NPT like those on the Ford Y.  As a FYI, a NPT hole is not measured across the top of the threaded hole but rather on the size of the hole within the pipe that goes into that threaded hole.  A ¼” NPT hole will be approximately ½” as measured across the top of the hole.

Lorena, Texas (South of Waco)

I've seen a lot of sending units with 1/8" threads, unless that's the electrical connection size. I assume all units are basically the same and as long as it screws into the block it should work. Am I correct? If so, I have options without having to find an elusive lyb part. And is an adapter a viable solution if the sizes are different?

Brad
Sierra Vista Arizona
1954 Lincoln Capri

____________________________

Just like it but mine has a rivet. Does that make a difference?

Brad
Sierra Vista Arizona
1954 Lincoln Capri

Is that one for sale?

Brad
Sierra Vista Arizona
1954 Lincoln Capri

I'm seeing a lot of sendors online that say thread 1/8 npt. Anyone know what that is referring to? It can't be 1/8". Pictures show what looks to be a similar size to the lincoln one. Just trying to find a suitable replacement

Brad
Sierra Vista Arizona
1954 Lincoln Capri

The sensor you have is almost certainly 1/8” NPT. Most oil pretty switches are. If it’s a light, it’s a switch. If it’s a gauge, it’s more sensitive. Most old cars would have either a mechanical oil pressure or just a light. I’m guessing yours is a light. Those operate at 5-10lbs pressure in my experience.

So if you measure the outside diameter, and it .4, just under 1/2”, it’s 1/8” NPT.

Picked up from the internet.

“The dimensions for a 1/8 inch National Pipe Thread (NPT) are:
Outside diameter: 0.405 in
Handtight engagement: 0.1615 in

NPT threads are tapered, so the nominal diameter is the diameter in the middle of the threaded portion. The outside diameter of an NPT fitting is usually about 1/4 in larger than the fitting's name. “




miker
55 bird, 32 cabrio F code
Kent, WA
Tucson, AZ

So would another sensor work on my car, if it's designed for a gauge, since that's what's in my car? If the threads are the tight size? Oh, BTW, Hi Mike
And will a regular tap and die work on npt? That's what I used to try to fix the threads.

Brad
Sierra Vista Arizona
1954 Lincoln Capri

Trying to retap a nipple that short can be a challenge, and I don’t know if they make a thread “chaser” for those.

Yes, if it’s a gauge, likely it’s pretty special. If you can’t find one, try the instrument repair guys. Also, I don’t know what Lincoln used, but Ford used the King Seeley gauges. I’ve had some luck looking on the Jeep Willy’s sites for info on those. Maybe one of the Lincoln guys will chime in.

I see you guys are at least in the low 90’s, when Tucson cools off I’ll come back.

miker
55 bird, 32 cabrio F code
Kent, WA
Tucson, AZ