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Unread 03-23-2009, 12:41 PM   #1
planedog
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How to seal NP231 yoke?

I couldn't find the "seal washer" to seal the fron output yoke on the 231 so I tried black RTV but it didn't work. How have you folks been sealing the splines through the yoke? Thanks

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Unread 03-23-2009, 02:10 PM   #2
Jkanly
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http://www.jeep4x4center.com/jeep-tr...-231-parts.htm

you need number 11. I don't think you can do it any other way.

the seal is $8 at advance autoparts iirc
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Unread 03-23-2009, 02:16 PM   #3
jdarg
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IIRC there's a little rubber seal with the spine pattern around it that fits inside the yoke. It sites between the yoke and the big nut. The quadratec diagram does not show it.
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Unread 03-23-2009, 02:17 PM   #4
planedog
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Thanks, Jkanly. I guess I should have been more specific. When I took this 231 apart there was a rubber washer of sorts under the nut that holds the front output yoke on. I was unable to find this seal washer, tries RTV, and now the splines are leaking a lot. What I am trying to figure out is how to seal those splines? Thanks.
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Unread 03-23-2009, 03:03 PM   #5
ctm
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RTV will work if you clean off the splines on the shaft and the yoke with brake cleaner, then let it dry and put on the RTV. Let the RTV set up for 5-10 minutes before you assemble. FWIW I've never seen that crazy washer on any other yoke. By the way I use Dynatex RTV , I found it much better than the permatex autozone stuff.
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Unread 03-24-2009, 08:38 AM   #6
planedog
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Thanks, I picked up some 3M gray RTV yesterday that is supposed to do the trick. When I put it back together I just put some black RTV under the nut, where the washer was, and it leaks like a seive!
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Unread 03-27-2009, 09:05 AM   #7
planedog
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To answer my own question, and to help others who might be interested, the way you can seal the fron yoke on a NP231 is to use grey RTV. I used black when I assembled the case and when I took it apart it was still not set up. I guess the transmission fluid reacts with the black for some reason. I sealed it with 3M grey RTV making sure that there was plenty of it on the splines of the yoke and under the nut, immediately put fluid in and have no leak at all as of now, 2 days later.
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Unread 03-27-2009, 09:36 PM   #8
azgurney
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It got the yoke sealing washer from the Jeep dealer. It is only a few dollars.
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Unread 06-06-2011, 04:15 PM   #9
NHfireLJ
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Found the parts at extreme terrain.com

Front Output Seal for NP231 Transfer Case 4338893

Yoke Washer Front Rubber For 1987-07 NP231, NP242, NV241, NV249 4210973
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Unread 06-06-2011, 05:46 PM   #10
ErikJordan
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Use the splined washer and the sealant. Have all parts clean, dry and free of oil. Torque to spec.
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