Speedometer sensor leaks?

Eddie Greenlee

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When attaching the speedometer sensor the top of the SYE, do you just tighten the bolt down or do you put a sealer on it and then tighten the bolt down ?
mom Chasing down a leak and it looks like it’s coming from the sensor

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When attaching the speedometer sensor the top of the SYE, do you just tighten the bolt down or do you put a sealer on it and then tighten the bolt down ?
mom Chasing down a leak and it looks like it’s coming from the sensor

View attachment 258471
I didn't use any sealant. I just torqued it to the recommended spec according to JB conversions(SYE kit manufacturer). Haven't had any issues with it so far.
 
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Well the sensor had a good O ring so I just tightened it back down.
so I moved on to the super short SYE from teraflex and changed out the output shaft seal. I’ll drive it tomorrow and see it that stops the leak.
 
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Well I put a new output / yoke seal in the teraflex super short SYE and buttoned everything back up. Waited well over 25 hours and took it for a test drive. When I got back oil was all over the rear of the transfer case and skid plate.
So I cleaned everything up, then took the rear drive shaft , skid and transmission mount off and supported the t-case. The weep hole under the trans and transfer case was dry as a bone ( thank goodness). Anyway, I started the Jeep , put it in Drive , reved it up to 2000 rpms and the oil started coming out of the speed sensor.
so I guess the O ring is bad. I’ll replace the Oring and let y’all know.
 
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is there a reliable source for the o-ring? AFAIK my JB SS SYE uses the factory mopar sensor, and the o-ring is 5093612AA which shows to be discontinued everywhere I've looked. Mine is leaking so I'd like to have a replacement on hand rather than risk tearing it up upon removal and having to run around town finding something that matches.
 
i found a post on ROF that it's 3/4 ID x 1/16 cross section and those are out there, but I'm not enough of a materials guy to know whether I should look for Viton, silicone, nitrile or what. I came across something saying EPDM isn't great for oil resistance so that's probably out. Obviously need something good for the temperature range and resilience.
 
Well the O ring was intact but had a small flat place in it. That was the problem !!
I replaced an no more leak. 😁

I had a similar problem with mine. The o ring was out of position and flattened. I replaced the o ring with one of similar size and added a small amount of RTV per advice from the wizard.
 
I found an assortment pack of o rings for oil filter relocation at the AUTOZONE and just used the closest one with a little RTV . Working fine
 
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i found a post on ROF that it's 3/4 ID x 1/16 cross section and those are out there, but I'm not enough of a materials guy to know whether I should look for Viton, silicone, nitrile or what. I came across something saying EPDM isn't great for oil resistance so that's probably out. Obviously need something good for the temperature range and resilience.

Looks like viton and silicone have the best temperature ranges. The existing ring is black which means it's not likely silicone but it didn't work out too well so I'm up for trying something new.