This plug is not any of the oil drain plugs. It is a unique plug in the pan that screws flush into the pan with no exterior head. My owner's manual calls it a Hex Plug. I saw it once referred to on here as the Crank Plug. Does anyone know the thread size of this plug? Please let me know. Thanks!

 

What did you do?

 

The plug is for an oil temp gage. I'm not sure of the tread size though, but the crank plug is in the bottom of the crank case not the oil bag.

 

It is a 3/8 NPT (male)

 

I'm trying to make my own 'total oil change' system and I need a fitting for that hole to attach a tube to so I can suck one quart of oil up into the engine and pump out approximately 1 quart of contaminated oil before filling the case with fresh oil. So the fitting screws into that hole and the fitting has a barb on the other end that you can clamp a hose onto. That's all.

It looks like this. I needed to know what size the thread is.

 

thank you!!