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Unread 01-15-2012, 03:44 PM   #1
zyal8r
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249 Viscous Coupler Replacement Question

I've spent a lot of time reading threads on how to replace the viscous coupler, carefully studied this page: http://www.masoncomputing.com/np249/ and several posts here on the forum. Ran in to what I think is a snag. It appears to me that the snap ring inside the access panel has a tab broken off. Pretty sure this will necessitate taking the case completely out, but I wondered if you guys might take a look and confirm what I'm thinking - this is as good of a picture as we could take with the case still in the Jeep. I've circled the one tab we can see. We were able to move it back and forth, which I suspect we would not be able to do if there were had been two tabs visible.



BTW Jeep is a 5.9 with ~170k miles.

Thanks for any input.

Mike

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Unread 01-15-2012, 04:09 PM   #2
Timo_90xj
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The two tabs should be almost side-by-side, with just a little gap between them. If you were able to rotate the snap ring and only saw one tab, then the other is most likely broken.

Can't remember if you must disassemble the tranfer case if that happened, or if you can even do it easily. For some reason I got a blurry picture in my head that the snap ring needs to come off before you can even pull the tailhousing or the rear half out.. I could be wrong though.
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Unread 01-15-2012, 04:20 PM   #3
PolkaPower
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You are not going to get the tail housing off without that snap ring off. I only see one end of the snap ring in that pic. The snap ring on the tail shaft looks like this. There should be a pointer fingers width between the two ends of the ring while it's on the shaft.
snapring.jpg  
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Unread 01-15-2012, 04:28 PM   #4
Candymancan
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Have you tried spinning the tab to the right ? Because you can actually spin that thing in both directions. I bet thats what happend
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Unread 01-15-2012, 04:31 PM   #5
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It's possible that that is the bottom tab and the other one is in the darkness.
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Unread 01-15-2012, 06:39 PM   #6
KJK
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Quote:
Originally Posted by PolkaPower View Post
You are not going to get the tail housing off without that snap ring off. I only see one end of the snap ring in that pic. The snap ring on the tail shaft looks like this. There should be a pointer fingers width between the two ends of the ring while it's on the shaft.
That is not what the factory snap ring looks like. It has 2 tabs that you use a flat nosed snap ring spreader on.
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Unread 01-15-2012, 06:50 PM   #7
PolkaPower
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Quote:
Originally Posted by KJK View Post
That is not what the factory snap ring looks like. It has 2 tabs that you use a flat nosed snap ring spreader on.
I would say that it's similar looking, in the ball park as opposed to the snap ring that holds the oil pump on. I couldn't find a pic of it earlier. But here it is.
1013111144.jpg  
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Unread 01-15-2012, 07:05 PM   #8
MN59ZJ
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Either way, the case needs to come apart, because a piece of metal is flying around the inside of your t-case. It's bound to cause major damage if left in there.
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Unread 01-15-2012, 09:15 PM   #9
zyal8r
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Thanks for all the replies! Got a better picture - 2nd tab definitely looks broken to me. Question is, where the heck is it, and how have I gone 170k miles without something blowing up... And even better I guess I need to find a new one. Not having much luck searching the 'net thus far.



Thanks,
Mike
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Unread 01-15-2012, 10:18 PM   #10
PolkaPower
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That sucks. You can kind of see it in the first pic but wasn't sure. Post how you got it out. I am interested.
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Unread 01-15-2012, 11:29 PM   #11
MN59ZJ
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If you're lucky, it sank to the low point of the case near the drain hole. There is a magnet there that could have captured it. I had a 231 suck a broken lock ring through all the main gears, ending up at the input planetaries. Made horrible grinding noises. The problem is, there's no way to know without cracking it open & looking.
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Unread 01-15-2012, 11:33 PM   #12
tower93zj
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just swap in a np231 and be done with it
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Unread 01-15-2012, 11:59 PM   #13
PolkaPower
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True you have many options now. In all honesty I like the 249 but if I had to drop the case I would be swapping it for sure.
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Unread 01-16-2012, 07:37 AM   #14
zyal8r
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Well, I do like the 249, and though I have enjoyed 2WD mode without the front driveshaft, I always liked the stability of the full-time 4WD when the VC was working. I already have the VC, too. I have not yet found a source for a new retaining ring, anyone have any suggestions? I think if we can take it out it shouldn't be too bad. Worse case I suppose if we can't find a new ring, this one works if we can get it off and then back on.

Mike
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Unread 01-16-2012, 08:10 AM   #15
PolkaPower
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Wost comes to worst you could always try a junk yard. I found a 249 opened up the other day.
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