NV-249 engaging question - JeepForum.com

 
LinkBack Thread Tools
post #1 of 6 Old 03-21-2013, 06:24 PM Thread Starter
Maine1994ZJ
Registered User
1993 ZJ 
 
Join Date: Feb 2013
Location: Phippsburg, Maine
Posts: 845
NV-249 engaging question

Hey, all!! I'm going to check out another ZJ for my wife to DD. It has a 4.0, 42RE, and NV-249. All with 229K miles.

My question is: If it's working properly, how long should it take the viscous coupling to engage the front axle when the rear axle spins?

I'm planning to run it through some snow to test it out and I was hoping to be armed with knowledge.

Any help is most definitely appreciated!!!!!


'93 V8 ZJ Mountain Goat Edition.
'95 V8 ZJ Limited, '97 4.0L ZJ TSi
'96 4.0L 2wd XJ, '88 4.2L YJ
Maine1994ZJ is offline  
Sponsored Links
Advertisement
 
post #2 of 6 Old 03-21-2013, 07:05 PM
zarnold
Member
1998 ZJ 
 
Join Date: Oct 2012
Location: Park Ridge
Posts: 360
Quote:
Originally Posted by Maine1994ZJ
Hey, all!! I'm going to check out another ZJ for my wife to DD. It has a 4.0, 42RE, and NV-249. All with 229K miles.

My question is: If it's working properly, how long should it take the viscous coupling to engage the front axle when the rear axle spins?

I'm planning to run it through some snow to test it out and I was hoping to be armed with knowledge.

Any help is most definitely appreciated!!!!!
If it's working correctly, the transfer will be instantaneous. Not sure how you will test that, but I'm sure somebody will know.

What you need to test is the VC itself. To do that first get to operating temp (e.g. drive for 20 minutes or so). Then in a parking lot drive in figure 8's. If you can idle through the 8's your probably OK; if it binds, jumps, hops or you have to give it gas to push it through the 8's your VC is probably already done, or on the way out.
zarnold is offline  
post #3 of 6 Old 03-21-2013, 07:37 PM Thread Starter
Maine1994ZJ
Registered User
1993 ZJ 
 
Join Date: Feb 2013
Location: Phippsburg, Maine
Posts: 845
Quote:
Originally Posted by zarnold View Post
Not sure how you will test that
I was planning on backing it up a snowbank in 4HI to test it. That SHOULD work... In theory anyway

Will definitely do the figure 8s!! Thanks for the tip!!

'93 V8 ZJ Mountain Goat Edition.
'95 V8 ZJ Limited, '97 4.0L ZJ TSi
'96 4.0L 2wd XJ, '88 4.2L YJ
Maine1994ZJ is offline  
post #4 of 6 Old 03-22-2013, 10:28 AM
ratmonkey
R.I.P.
 
ratmonkey's Avatar
1997 ZJ 
 
Join Date: Dec 2006
Posts: 19,793
At that mileage if it hasn't been replaced its guaranteed to be bad. The 93-95 units don't last 100k and the 96-98 units are toast by 150k.

'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

ratmonkey is offline  
post #5 of 6 Old 03-23-2013, 06:10 PM
RTLee
Registered User
1995 ZJ 
 
Join Date: Feb 2012
Location: St. Joseph
Posts: 17
Before you buy:
1: vehicle off, put in drive with emergency brake on.
2: jack up RF wheel.
3: use torque wrench set to 90lbs. Try to turn the wheel (using wrench). If wrench clicks, viscous coupler is bad.
4: walk away if wrench clicks.

Otherwise it's a TC swap or VC replacement. Each is pricey in their own way.

Good luck!!

Edit: source is Identifix and Chrysler service manual. This is how I found out my TC was bad.

Last edited by RTLee; 03-23-2013 at 06:12 PM. Reason: Sources quoted...
RTLee is offline  
post #6 of 6 Old 03-23-2013, 07:17 PM Thread Starter
Maine1994ZJ
Registered User
1993 ZJ 
 
Join Date: Feb 2013
Location: Phippsburg, Maine
Posts: 845
Thanks guys. I went to see it. Long story, short The woman selling it was a TOTAL PSYCHO!!! I'm traumatized now...
20 minutes of my life I will NEVER get back

'93 V8 ZJ Mountain Goat Edition.
'95 V8 ZJ Limited, '97 4.0L ZJ TSi
'96 4.0L 2wd XJ, '88 4.2L YJ
Maine1994ZJ is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome