Temperature Sending Unit

1970-1655

Member
Anything special about a 50 series diesel temperature sending unit? Or would one from an automotive parts house work? Has 1 wire, 1/4 pipe threads (I think). I would have to go out to the cold shop to make sure. It also is screwed into a reducer bushing so thread size is flexible.

Mine reads cold until it runs about 10 minutes, then pegs to the hot side. Radiator does not feel too hot. New gage and wire to the sensor.
 
The sender SHOULD match the gauge, but if you found one that "screwed in" and was not calibrated to your gauge, you might be able to tell if the engine is overheating or not. At the very worst, your gauge might read differently than what the actual temp is.
 
I can't remember now which tractor I replaced one on. I used one from a mid to late 60s Oldsmobile. It looked identical. Can't say if registered exact,but the Oliver gauges don't have an actual temp number on them anyway,just a general idea.
 
Sounds like it is a SWITCH rather than a sensor. Like for an idiot light instead of a gauge. Also senders work by varying the ground so you have to be careful with sealant &/or anti sieze to make sure the sensor gets a good ground.
 
I have a temperature gauge exactly like it came from the factory. The old one went bad so I bought a NOS one. It did not come with wiring or sending unit. I ran new wires so that would be good. The sender I now have might be an automotive part. Don't remember if dad replaced it any time in the past century. It worked like it should until the gauge went bad. I did not worry about it for several years because the tractor never got used hard enough to overheat.
 

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