4.0 Crank walk - JeepForum.com
Reply
 
LinkBack Thread Tools
post #1 of 18 Old 04-12-2019, 05:50 AM Thread Starter
02Lightning
Registered User
2001 WJ 
 
Join Date: Dec 2005
Location: Dayton, OH.
Posts: 692
4.0 Crank walk

So Iíve been chasing a front belt squeal that I couldnít pinpoint until I replace my harmonic balancer and it got worse. It looks like my crank is walking maybe 3/16 of an inch and causing the belt to misalign. So my plan of attack on this is to pull the pan, inspect the thrust bearing, and hope that it has not worn into the block. My best case scenario is to just replace the main bearings, if the crank is bad then pull the motor and install a crank kit. But, if the block is bad, then I will be at a cross road if the jeep is even worth a long block. Has anyone had this problem? It has 160k on it and I bought it at 110k and religiously change the oil at 5k. Just wondering what the cause would be. Otherwise, the motor runs good with the exception of some lifter rattle at start up in cold weather.


2001 Jeep Grand Cherokee Laredo 4.0L NV242LD Transfer Case, 42RE, 160,000 miles
02Lightning is offline  
Sponsored Links
Advertisement
 
post #2 of 18 Old 04-12-2019, 10:01 AM
2oldjeeps
Registered User
2000 XJ Cherokee 
 
Join Date: Aug 2017
Posts: 955
?, not an xpert but hard to think the crank could move that much without oil problems, rods twisting and a lot of noise...double check, can you move it???


is it the pulley?

99wj,143,000 miles
00xj,177,000 miles
10hummer3,74,000 miles
98xj,130,000 miles
2oldjeeps is offline  
post #3 of 18 Old 04-12-2019, 11:52 AM Thread Starter
02Lightning
Registered User
2001 WJ 
 
Join Date: Dec 2005
Location: Dayton, OH.
Posts: 692
The harmonic balancer (and pulley is all one unit) is new, I just put it on because I thought it was separating. But, if I give is throttle from under the hood, I can see it walking away from the motor maybe 3/16".

2001 Jeep Grand Cherokee Laredo 4.0L NV242LD Transfer Case, 42RE, 160,000 miles
02Lightning is offline  
 
post #4 of 18 Old 04-12-2019, 02:03 PM
FanTech
Registered User
 
Join Date: Jul 2018
Posts: 134
Poor surface finish on the crank can cause failures to happen faster. You could also be experiencing high line pressures in your transmission. Is there any damage to the tranny lines/cooler? Do you have an auxilary cooler? The torque converter acts like a hydraulic ram that pushes the crank forward. Thrust bearings aren't capable of handling a lot of load.
FanTech is offline  
post #5 of 18 Old 04-12-2019, 03:17 PM Thread Starter
02Lightning
Registered User
2001 WJ 
 
Join Date: Dec 2005
Location: Dayton, OH.
Posts: 692
I put a cooler on it about a year ago and bypassed the internal cooler, i'll have to get under it and see if there is any damage.

2001 Jeep Grand Cherokee Laredo 4.0L NV242LD Transfer Case, 42RE, 160,000 miles
02Lightning is offline  
post #6 of 18 Old 04-12-2019, 03:43 PM
2oldjeeps
Registered User
2000 XJ Cherokee 
 
Join Date: Aug 2017
Posts: 955
gotta be the pulley not bottomed out when torqued.think about how many surfaces would have to wear to move that much without breakup!!
normal endplay is ? maybe .020 in.rods would bind or break.
did you torque the pulley bolt?

99wj,143,000 miles
00xj,177,000 miles
10hummer3,74,000 miles
98xj,130,000 miles
2oldjeeps is offline  
post #7 of 18 Old 04-12-2019, 04:06 PM Thread Starter
02Lightning
Registered User
2001 WJ 
 
Join Date: Dec 2005
Location: Dayton, OH.
Posts: 692
The old balancer walked out when I rev the motor, then after I replaced it, the new one it does the same. I replaced the seal, lubed the crank before installing the new balancer. Then torqued the center bolt to 80 ft. lbs., however I forgot the lube the bolt threads.

2001 Jeep Grand Cherokee Laredo 4.0L NV242LD Transfer Case, 42RE, 160,000 miles
02Lightning is offline  
post #8 of 18 Old 04-15-2019, 06:55 AM Thread Starter
02Lightning
Registered User
2001 WJ 
 
Join Date: Dec 2005
Location: Dayton, OH.
Posts: 692
Quote:
Originally Posted by FanTech View Post
Poor surface finish on the crank can cause failures to happen faster. You could also be experiencing high line pressures in your transmission. Is there any damage to the tranny lines/cooler? Do you have an auxilary cooler? The torque converter acts like a hydraulic ram that pushes the crank forward. Thrust bearings aren't capable of handling a lot of load.
What should the pressure be for my transmission?

2001 Jeep Grand Cherokee Laredo 4.0L NV242LD Transfer Case, 42RE, 160,000 miles
02Lightning is offline  
post #9 of 18 Old 04-15-2019, 09:31 AM
2oldjeeps
Registered User
2000 XJ Cherokee 
 
Join Date: Aug 2017
Posts: 955
????

99wj,143,000 miles
00xj,177,000 miles
10hummer3,74,000 miles
98xj,130,000 miles
2oldjeeps is offline  
post #10 of 18 Old 04-15-2019, 10:07 AM
jtec
Registered User
2014 JK Wrangler 
 
Join Date: Oct 2017
Posts: 5,346
How are you checking end play, just observing the balancer travel*?
have you dropped pan yet for a visual?
Is this the original engine -
Was there any knocking, oil pressure issue, particles in oil.
Might be my reading comprehension problem BUT I am confused as to what is issue.

Your describing moving the flywheel and converter, starter clearance issues, CKP distance, rod to piston center of piston alignment, wrist pin issue, -

OK trans pressure that varies IIRC 0 to 300 and full pressure would cause hard shifts and a pressure governor code I believe.


*Spec end play (0.0015 to 0.0065 in.) your claim 3/16 (.187) - makes me think something is missing in description.

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
jtec is offline  
post #11 of 18 Old 04-15-2019, 12:13 PM
2oldjeeps
Registered User
2000 XJ Cherokee 
 
Join Date: Aug 2017
Posts: 955
so i looked at my "new to me" 4.7 and the pulley/balancer wobbles!!
just have it 2 weeks so new 2 me.
how much wobble is ok?

99wj,143,000 miles
00xj,177,000 miles
10hummer3,74,000 miles
98xj,130,000 miles
2oldjeeps is offline  
post #12 of 18 Old 04-15-2019, 01:44 PM Thread Starter
02Lightning
Registered User
2001 WJ 
 
Join Date: Dec 2005
Location: Dayton, OH.
Posts: 692
Quote:
Originally Posted by jtec View Post
How are you checking end play, just observing the balancer travel*?
have you dropped pan yet for a visual?
Is this the original engine -
Was there any knocking, oil pressure issue, particles in oil.
Might be my reading comprehension problem BUT I am confused as to what is issue.

Your describing moving the flywheel and converter, starter clearance issues, CKP distance, rod to piston center of piston alignment, wrist pin issue, -

OK trans pressure that varies IIRC 0 to 300 and full pressure would cause hard shifts and a pressure governor code I believe.


*Spec end play (0.0015 to 0.0065 in.) your claim 3/16 (.187) - makes me think something is missing in description.
I haven't put an indicator on it or anything. No oil pressure issues and nothing in the oil that I noticed last time I changed it, but wasn't looking either. The problem I'm having is belt squeal, and I happen to notice the belt walking off the tensioner as I gave it gas and making the squeal noise. I then look down and notice the balancer moving away from the motor as I gave it gas, so I changed it figuring that balancer was coming apart, but it made my belt squeal worse. New tensioner, water pump, alternator and idler, nothing fixed it. My plan was to put a rear main seal in it, so I will inspect when I get it apart. Any other ideas?

2001 Jeep Grand Cherokee Laredo 4.0L NV242LD Transfer Case, 42RE, 160,000 miles
02Lightning is offline  
post #13 of 18 Old 04-15-2019, 04:22 PM
2oldjeeps
Registered User
2000 XJ Cherokee 
 
Join Date: Aug 2017
Posts: 955
r m seal? is it leaking?
rms has nothing to do with movement!!

99wj,143,000 miles
00xj,177,000 miles
10hummer3,74,000 miles
98xj,130,000 miles
2oldjeeps is offline  
post #14 of 18 Old 04-15-2019, 07:41 PM Thread Starter
02Lightning
Registered User
2001 WJ 
 
Join Date: Dec 2005
Location: Dayton, OH.
Posts: 692
Quote:
Originally Posted by 2oldjeeps View Post
r m seal? is it leaking?
rms has nothing to do with movement!!
Yes, the rear main has been leaking for a while. I realize that would have nothing to do with the crank walking. The thrust bearing is what keeps it in place.

2001 Jeep Grand Cherokee Laredo 4.0L NV242LD Transfer Case, 42RE, 160,000 miles
02Lightning is offline  
post #15 of 18 Old 04-15-2019, 08:31 PM
2oldjeeps
Registered User
2000 XJ Cherokee 
 
Join Date: Aug 2017
Posts: 955
thrust bearing in back huh?
did you see this?




Quote:
Spec end play (0.0015 to 0.0065 in.) your claim 3/16 (.187) - makes me think something is missing in description.

99wj,143,000 miles
00xj,177,000 miles
10hummer3,74,000 miles
98xj,130,000 miles
2oldjeeps 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











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



Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
Jeep 4.0 I6 engine crank no start, no spark, no Fuel Ridettu21 Jeep CJ Forum 11 02-19-2019 03:39 PM
2003 4.0 intermittently will not crank brunnerj30 WJ Grand Cherokee Forum 12 02-18-2019 06:58 PM
99 4.0 crank sensor replacement method. frankjc WJ Grand Cherokee Forum 13 08-15-2018 03:27 PM
91 4.0 won't crank when engine cold without some starting fluid? JimE2 YJ Wrangler Technical Forum 4 03-10-2018 12:46 PM
2000 Jeep Grand Cherokee Laredo 4.0 inline 6 cylinder slow crank worthspending WJ Grand Cherokee Forum 3 11-25-2017 05:29 PM

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