Oil Pressure Switch

Mektek

Well-Known Member
The used oil pressure switch installed a year and a half ago started to leak. I decided to go with a new one.
Local part stores had it for $47 - fleabay had a PS310 switch for less than five bucks:yes:
The only catch is that I have to wait two weeks for a package from Hong Kong.

Just an FYI for a economical solution to this common problem. There is a thin plastic membrane between the oil pressure and the electrical switch. And easy point of failure.
 

Mounce

Well-Known Member
Wow that's cheap, let us know how that works in the long run. I'd definitely keep an eye on it in case it starts to leak too.
 

Reprise

Lifetime VIP Supporter
I think at that price, I might've gotten TWO. Even if the first one breaks (at some point) -- you're $ ahead!
 

Aaramill

Member
Watch a couple YouTube videos so you know what sockets, adjusters, etc you need.

I did it with:
deep socket/oil pressure switch socket
Extension
socket Adapter that has an adjustable joint



Switch is a dummy switch anyway. The oil pressure reading on the dash isn’t real unless you have an SS. The switch sends a different signal when under something like 12 psi? If I remember right.

Switches get sticky or stuck.
On our 2 4.2’s, it’s been leaving them outside in the cold later in life...150-200k mi.

The little mesh filter piece beside it is important too. I think they added it in 04, but I think you can add it with an earlier model.
 

Mooseman

Moderator
The little mesh filter piece beside it is important too. I think they added it in 04, but I think you can add it with an earlier model.
Are you confusing this with the one in the DOD V8's? The 4.2 doesn't have one.
 

C-ya

Well-Known Member
Switch is a dummy switch anyway. The oil pressure reading on the dash isn’t real unless you have an SS.

The little mesh filter piece beside it is important too. I think they added it in 04, but I think you can add it with an earlier model.
The 5.3 V8 has a true pressure reading switch. The 5.3 motors have a screen under the switch to keep crud out of the switch, and in the case of DOD engines, out of the collapsible lifters.
 
OP
OP
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Mektek

Well-Known Member
While I was doing an oil change yesterday I installed the ps310. Looks just like the original and seems a good replacement. I wrapped a piece of sheet metal inside a 30mm socket and did not use the special socket. To keep these old trucks on the road we have to save a buck everywhere we can.
 

Berns

Well-Known Member
Just throwing it out there....

I have the tite reach set that I got as a gift and when I needed to switch mine out on my 4.2 it was a breeze.

I was struggling trying to get the switch out in the tight space so I kept trying different ratchets to see which one would work without backing out and hitting the body and having no room to slide the ratchet off the socket. While searching for another ratchet in my tool box I looked up and I noticed that I had hung up the set and decided to try the 3/8 extender. In less than 5 min, took the switch out and put one in. This was after 15-20 min struggling to get the switch out and fighting with the limited space and my big hands.

I have only used them a couple of times but the extenders are great for these types of jobs.
 

Berns

Well-Known Member
Sure is a knuckle saver. Has gotten me out of a few snags. I have not tried with impact even though it states it is impact rated.
 

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