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Unread 04-29-2013, 07:21 PM   #1
travisschroer
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np249 vc rebuild

OK so here is the deal this is my first jeep and I love it. I used to be huge into VW and may be able to bring something new to the jeep table. I have rebuilt VW synchro vicious coiplers . The fluid is the same 100000 fluid here is the link

http://www.silikon-profis.de/index.p...d=bdlyharfaxme

Now I'm looking for A np249 vc and does anyone know if they are filled 85% like the VW?

So I know the 249 has a bad rap but it seems its all the vc that fails and I'd we can make a repair kit for 100? bucks I think it would be a viable option.

Anyone have any input?

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Unread 04-29-2013, 08:00 PM   #2
bigb229
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Most folks throw the 249 in the parts pile when it goes bad and swap a 231 or 242 in.
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Unread 04-29-2013, 09:19 PM   #3
Timo_90xj
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Quote:
Originally Posted by bigb229 View Post
Most folks throw the 249 in the parts pile when it goes bad and swap a 231 or 242 in.
Most do this because they want rwd and 4hi, and don't want to spend the couple hundred bucks on a new vc unit. If only there was a bolt-on tc like the Mitsubishi's super select (rwd, viscous-coupled awd, 4hi locked and 4lo locked) for Jeeps..

VCs can be rebuilt (silicon fluid drained and refilled) and it's fairly common in the VW Syncro world. However, there isn't much data available for the Jeep VCs on the amounts and fill levels. It would be a lot cheaper though, compared to complete high quality replacement vc units.
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1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...

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1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***

***Under construction***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***
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Unread 04-30-2013, 07:00 AM   #4
travisschroer
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Quote:
Originally Posted by Timo_90xj View Post
Most do this because they want rwd and 4hi, and don't want to spend the couple hundred bucks on a new vc unit. If only there was a bolt-on tc like the Mitsubishi's super select (rwd, viscous-coupled awd, 4hi locked and 4lo locked) for Jeeps..

VCs can be rebuilt (silicon fluid drained and refilled) and it's fairly common in the VW Syncro world. However, there isn't much data available for the Jeep VCs on the amounts and fill levels. It would be a lot cheaper though, compared to complete high quality replacement vc units.
This is what I was thinking I'd like to find out how much is in it And at least make it an option for is to rebuild them. Question is does anyone have a rebuilt unit they can weight on a digital scale for me. I figure if we know the rebuilt weight k can find a used one and soak it on acetone and drain it and make IP the difference in silicone fluid. I figure this should either work or get us close at least.

And I will have to look into the super select mechanism maybe be Able to steal some technology from it
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Unread 04-30-2013, 08:05 AM   #5
Timo_90xj
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I was seriously considering finding a way to use a viscous coupler in place of the 242s 4-full time planetary gear unit. There just isn't enough room for it That way I would've had a system similar to what some of the Mitsubishi Montero has (Pajero in the non-spanish speaking countries ).

I have a used, sealed VC unit but it doesn't really help a lot..
__________________
1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...

http://www.jeepforum.com/forum/f13/d...s-etc-1222317/


1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***

***Under construction***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***
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Unread 04-30-2013, 02:19 PM   #6
ratmonkey
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there's absolutely no data on what fluid is used(we know they're different between the early and late models) fluid fill amounts, and repair techniques. they're welded closed so no easy job repairing them.
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Unread 04-30-2013, 03:24 PM   #7
PolkaPower
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I have read that the fluid is put in under pressure as well.
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Unread 04-30-2013, 09:00 PM   #8
travisschroer
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Quote:
Originally Posted by ratmonkey View Post
there's absolutely no data on what fluid is used(we know they're different between the early and late models) fluid fill amounts, and repair techniques. they're welded closed so no easy job repairing them.
For the life of me I can't find the thread now but someone had found out it was 100,000 in the 96 to 98 and 80,000 in the 93 to 95 I believe he actually got a hold of a Chrysler engineer to find out. And are the not like the vw one where they have 1 or 2 screws that access the fluid reservoir. The vws had 2 and I'd soak them in acetone and put I believe 287g of fluid back in an all was good.

Sorry I know I'm beating a dead/dying horse
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Unread 04-30-2013, 10:18 PM   #9
PolkaPower
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Here is an old PDF article about it. It doesn't say that the fluid is put in under pressure but it does say that it is non serviceable. Doesn't give exact amounts for the fluid but it does say that it is so viscous that if some spills out you can not get it back in which leads me to think that it has to be filled under pressure.

http://www.google.com/url?sa=t&rct=j...45921128,d.dmQ
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