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-   -   NP 231 TC Leak. Arrgh! (http://www.wranglerforum.com/f218/np-231-tc-leak-arrgh-241183.html)

Fredzo 05-07-2013 09:27 PM

NP 231 TC Leak. Arrgh!
 
I just installed a Q9000 winch on my '89 Sahara, and had to go to the grocery store for the wifey. Got a block down the road, and the rear driveshaft straps broke, releasing my rear shaft at about 2500 RPM! What a coinkydink!

Anyhoo, we used my wife's 2005 Liberty to pull the old gal home.

I pulled the driveshaft and replaced both Spicer U-joints with Chink crap, and re-installed, worrying about a possible driveshaft seal leak, but that didn't happen.

What I have is a slow seep from the bottom of the "rear retainer" that mounts to the TC, ahead of the extension housing.

It looks like the short, but voilent, thrashing of the driveshaft caused some motion on the retainer housing, allowing a tiny-diameter O-ring to slip out, causing the leak, or "seep". It loses about 1/2 pint a day, and I haven't driven the jeep, except to move it from my shop to the bay where I park it.

Any ideas on what should be done? The seal isn't leaking, but, obviously should be replaced while I'm in there, but can I get by with some silicon to stop the seep for a couple of weeks? I have a trail ride that I'd like to make next week.

TIA,
Fred

Fredzo 05-07-2013 10:49 PM

Bump. Help!

jokerchief462 05-07-2013 11:03 PM

1 Attachment(s)
OK what tiny o-ring??? You have a rear seal for the slip yoke if it is stock and the speedo housing has an o-ring, and then you have case seams one for the tail housing and one for the case halves. So a little more description or picture would help. I just can't picture the rear retainer that mounts to the transfer case ahead of the extension housing. Let me know from the diagram of the NP-231 what you or where you are leaking.

Fredzo 05-08-2013 12:29 AM

Quote:

Originally Posted by jokerchief462 (Post 3731630)
OK what tiny o-ring??? You have a rear seal for the slip yoke if it is stock and the speedo housing has an o-ring, and then you have case seams one for the tail housing and one for the case halves. So a little more description or picture would help. I just can't picture the rear retainer that mounts to the transfer case ahead of the extension housing. Let me know from the diagram of the NP-231 what you or where you are leaking.

Same pic as wyou have, but about a 1/16" 0-ring sticking out of the front of p/n 35 on the dwg, where it attches to p/n 32. Same as factory. Bolts are tite; never had a problem until I dropped the rear driveshaft due to a bad srtap bolt.

Mucha gracias, and thanks from a Viet Nam Vet!

And there were strings of about a 1/16 o-ring (or RTV), dangling from the tested tight hardware against the "rear retainer", Part #35, from where it set against the rear case, Part # 32 ' of the transfer case.

Again, it's just a seep, but I haven't strained the driveshaft seal yet.

Also., I put about 1/8 mile on the whole thing before I got out of traffic.

Thanx for your help!

Biggest question is why does it leak around the rear retainer? Did I knock it loose, or break it. Don't see leaks anywhere. Magnaflux?, or replace.

I stuck some RTV around it, up to the fill thingie, and it doesn't leak RIGHT NOW, but what's the next step to make it right?

Fredzo 05-08-2013 01:02 AM

Belay my last! In your breakdown, It was p/n 42 to 34 that is leaking. I'm using the Idiot's Guide instead of my MoPar.

Sorry!

jokerchief462 05-08-2013 10:04 AM

I am betting you knocked it loose enough to leak and it is all RTV. You need to drop the driveshaft, drain the T-Case and remove the tailcone. Clean the area and look for any damage from the driveshaft incident. Clean everything up and reassemble if it is all good. Usually when the driveshaft separates they wipe out the tailcone and end up being replaced. So check it out before you go wheeling you could ultimately burn up the T-Case while your out without enough oil if the leak is bad enough. It should only take an hour to get everything done if it is not damaged.

Fredzo 05-08-2013 02:24 PM

Oops! I was wrong. The seep is between the rear case (34) and the rear retainer (42). I slapped some RTV on there and it slowed it down to almost nothing.

No leaks from the rear of the extension housing.

Tyler92yj 05-08-2013 05:47 PM

kind of off topic but what size is the fill and drain plug on np231

Fredzo 05-09-2013 12:27 PM

Quote:

Originally Posted by Tyler92yj (Post 3734519)
kind of off topic but what size is the fill and drain plug on np231

I use a 10" Crescent, but it's about an inch.

Fredzo 05-09-2013 05:50 PM

Update: Just took it to the local Jeep Guru, and he's replacing the goop between the TC housing and the whatever it is, replacing the rear end yoke, replacing the front U-joint on the rear driveshaft, and balancing the shaft for $275 including P&L!

Barely leaking after I squirted it with RTV, but don't want to take a chance of it failing.

Besides I HATE drips on my bay floor!

:dance::dance::dance:


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