mikespike

Hey folks. Can anyone tell me the best way to get this oil pressure switch out? Lubed it with wd40 overnight and now just trying to figure out what size it is, can't get my 1 inch socket on there since it's too short and bottoms out on the ratchet drive, and I can't get a wrench on it due to space constraints with the radiator and shroud being there... overall it doesn't look like a proper hex nut, it has these weird ridges to it and such. Any help is greatly appreciated.

1970cs

Oil pressure switch socket. I have one that I bought for ag applications, but It worked on my Oldsmobile also.

BillK

Most of them are 1-1/16 " My socket does both 1" and 1-1/16" . Any auto parts store should have them. Get a deep socket if you can. Mine is a KD 2569

BackInTheGame

Douse that bad boy with PB-Blaster, and tap it lightly to help the PB seep down into the threads. Wait a day or two, and do it again. WD-40 is not a lubricant, nor a rust solvent. WD stands for Water Displacement. About all its good for is temprarily coating something against the elements. Key word here is "temporarily."

mikespike

Oh yeah I just used Liquid Wrench its a penetrating oil, just said WD40 incase Liquid Wrench isnt available in the US which is where I imagine most of the folks on here live, I'm in Canada so idk if ALL of our brands line up.

oldcutlass

I gently use a channel lock pliers.

Vintage Chief

I mix then use Acetone & ATF in a 1:1 ratio

mikespike

Both great ideas.