Hi all. I am in the middle of changing a leaky transmission electrical connector and when taking the plug out I noticed that the O ring on the socket itself is what had torn not the two on the replacement connector. I thought this was no big deal and bought a set of universal O rings. But after replacing it and trying to reinstall it, it appears the new O ring is too thick and it will not seat.

is there a specific O ring that I need to get? I’m at a standstill until I can figure this out

 

Why not replace the whole connector? This way you get the correct O-ring inside, outside and cross section dialmeters. You also get the correct O-ring material, this is most important. It is the O-rings that fail mostly so it is critical that you get the correct sizes and material, otherwise you’ll be doing it again eat soon. The material can withstand higher temperatures than the standard O-ring material.

1/8” section nominal O-rings are actually .070”
3/32” are .103, 1/8” are .139, 3/16” are .210, and 1/4” are .275.
What is a universal O-ring?

 

the first photo is what I bought first to replace. The the red O ring on the second photo is what was torn on mine that I was looking to replace. The third photo is the universal gasket kit that I bought.

luckily I was just able to find that FCP sells the entire part with the gasket for 15 bucks so I just purchased that

 

The O-ring kit you have is National SAE; It will not work. The O-rings on the electric connector are metric. I believe you need a 75 Viton size 3 x 38 and the smaller diameter is 2.5 x 32.5.
You could try www.usasealing.com to find what you need.

 

one box was SAE the other was metric. Neither worked. I ordered what I needed from FCP now though so I’m good…hopefully

 

I am sure that a special O-ring was not made for this application.
O-rings are made by the millions so it makes no sense to make a part that requires a special O-ring.

 

beats me man but I tried multiple sizes from that kit and that connector would not fit with them on it but if I tested it with no O ring it went in easy peasy🤷‍♂️