914World.com > Stock oil temp sender testing

saigon71

Sep 25 2018, 11:57 AM

I'm bench testing a stock oil temp sending unit from a taco plate. It shows resistance of 2800 ohms at room temp and 160 ohms in boiling water.

The only reference I found to the resistance range on this is from McMark on this thread:

http://www.914world.com/bbs2/lofiversion/i...php?t97987.html

Where he says:

"These senders operate in a range of 3000 to 1000 ohms (pretty sure on this, my sample measures 2500 at room temp)."

Mine drops well below 1000 ohms when hot...is it still good?

dr914@autoatlanta.com

Sep 25 2018, 12:02 PM

considering that grounding the lead for the gauge pegs the needle, 160 seems to be a good number for the 212 degree temp

QUOTE(saigon71 @ Sep 25 2018, 10:57 AM)

I'm bench testing a stock oil temp sending unit from a taco plate. It shows resistance of 2800 ohms at room temp and 160 ohms in boiling water.

The only reference I found to the resistance range on this is from McMark on this thread:

http://www.914world.com/bbs2/lofiversion/i...php?t97987.html

Where he says:

"These senders operate in a range of 3000 to 1000 ohms (pretty sure on this, my sample measures 2500 at room temp)."

Mine drops well below 1000 ohms when hot...is it still good?

Dave_Darling

Sep 25 2018, 06:41 PM

The sender is an NTC thermistor, much like the CHT sensor and the intake air temp sensor. The resistance sounds at least in a reasonable range. I don't know exact values, but it should get close-ish to zero as the temperature gets hot.

--DD