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Old January 10th, 2019, 15:44
MickeyS MickeyS is offline
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Join Date: Apr 2018
Location: Pasadena
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Speedo gear leaking

231 case is leaking from the bottom of the speedo gear housing. did some searches and it seems people have this issue. some say there are two o rings. Where exactly do the two o rings go? there is one recessed in the housing that i see, and i see on multiple youtube videos, but i don't see two.

anyway, I replaced that oring and reinstalled. It's still leaking. what am i doing wrong? if i were to add RTV, where exactly should I seal?
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Old January 10th, 2019, 17:10
lazyxj's Avatar
lazyxj lazyxj is offline
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Join Date: Mar 2004
Location: Los Angeles
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Re: Speedo gear leaking

Having the same problem in the past, after replacing the o-ring, I used RTV silicone sparingly to seal the speedometer sender. It has stayed leak free for years.
Both XJs are still Real XJs
01 Sport, 4.6L Russ Pottenger 4.6, AW4, 4" lift, 33 X 10.50 KM2, 4.56-8.25 TruTrac, D-30-E-Locker with alloy shafts, Hidden M8000 winch, Vanco front and ZJ rear disc brakes, Frame stiffeners, Lots of armor, Towing baseplate.
1997 Country, Mostly stock, 2" lift, Engine mods, NP242, Towing baseplate
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Old January 10th, 2019, 22:44
MickeyS MickeyS is offline
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Join Date: Apr 2018
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Re: Speedo gear leaking

It seems to happen to people for some reason. So where exactly did you seal, between the t case lip and the speedo gear housing? Iím confused by people who say there are two orings.
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Old January 11th, 2019, 04:07
md21722 md21722 is offline
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Location: Colorado Springs
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Re: Speedo gear leaking

If you remove the speedo gear (held down with a fork and a 13 mm nut) there is an o-ring on it. Then if you remove the sensor from what you just pulled out, there is a 2nd o-ring. If you go down to NAPA and look at a speedo sensor, it becomes obvious where the 2nd o-ring goes.... The speedo sensor is actually 3 separate parts... the gear, the housing, and the sensor. The 2nd o-ring seals the sensor to the housing. The large o-ring that usually leaks is Mopar 6035709. I prefer using the Mopar part. I have had Crown owns leak shortly after install.
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