NAXJA Forums -::- North American XJ Association  

Go Back   NAXJA Forums -::- North American XJ Association > NAXJA Unibody Jeep Technical Forums > Jeep Cherokee XJ (1984 - 2001) > OEM Tech Discussion
HOME Member FAQ Sponsor Info Rules Bylaws E-Mail

OEM Tech Discussion Forum for OEM (Original Equipment) or stock XJs and MJs.

Reply
 
Thread Tools Display Modes
  #16  
Old June 19th, 2010, 16:51
kastein kastein is offline
NAXJA Forum User
 
Join Date: Jul 2009
Location: Central MA - keep going till the road turns to dirt, then listen for banjos
Posts: 14,009
Re: leaf spring bolt size PLEASE

I'm pretty sure they're the same part number and thus the same exact part, but I don't have my parts catalog on hand to prove it.
Reply With Quote
  #17  
Old June 19th, 2010, 17:16
5-90's Avatar
5-90 5-90 is offline
NAXJA Forum User
 
Join Date: Mar 2003
Location: Hammerspace
Posts: 18,799
Re: leaf spring bolt size PLEASE

Quote:
Originally Posted by xjnewbi View Post
Hey Kastein, thanks for the OEM part numbers and the website. You did originally say WJ but I automatically thought ZJ b/c my wife drives one so I could use hers as a donor - she would love that!

ehall - thanks for that info too - I noticed on 5-90s site that he lists the LCA bolt at 110mm and you had previously said that the OEM is 120mm. Lots of good info and advice here, THANKS everybody
The only information on the chart I'd consider "hard" would be the stuff I've measured myself - RENIX-era engines, at the moment. Anything else would be "reports from the field," and measuring techniques can differ (some people try to measure the flange and include it in the screw length. Some people eliminate the dog point on piloted screws. ...)

I suppose I should put up a "how to measure a screw" guide to get some consistency, but I've been working on other things (not the least of which is a fastener primer. I know BillAVista did one, but I want to recall that some sections could be expanded and some simply explained more thoroughly.) Therefore, that's probably where I'll end up putting information on how fasteners get measured as well.
Reply With Quote
  #18  
Old June 22nd, 2010, 18:52
xjnewbi xjnewbi is offline
NAXJA Forum User
 
Join Date: Oct 2007
Location: Jersey Shore
Posts: 222
Re: leaf spring bolt size PLEASE

Finally got some time to start working on this after work today. Got my LCA bolts from teamcherokee and they will work just fine. Jacked up the truck and unbolted the leaf spring - to my dismay, I find that the frame side leaf spring bolt has sheared right at the inside mounting bracket. Unable to get the remaining portion of bolt out, I opted to follow what others have already done - cut open the bottom of the mounting bracket to access the weld nut. Several smacks later with cold chisel and 3lb sledge, finally popped the weld nut and residual bolt off.

Here is my current problem - the access hole that I cut in the bottom of the spring mounting bracket is too small to get the weld nut and residual bolt out. The OEM bolt is so long that, after it threads through the weld nut, it extends into a hole in the unibody. My advice for anyone doing this, is to sawzaw the bolt at the back end of the weld nut THEN pop the weld nut off. This way you will have 2 smaller peices that will easily fit through the access hole that you cut. I will have to cut a larger access hole or tack weld a small bolt to the broken OEM so I can clamp it with vice grips and use a sawzaw to cut the bolt (then bust/grind the tack weld)

I can't seem to do anything the easy way
Reply With Quote
  #19  
Old June 22nd, 2010, 19:31
5-90's Avatar
5-90 5-90 is offline
NAXJA Forum User
 
Join Date: Mar 2003
Location: Hammerspace
Posts: 18,799
Re: leaf spring bolt size PLEASE

Quote:
Originally Posted by xjnewbi View Post
I don't think this will help much, but my stock bolt is a hex flange head with "ABC 9.8" stamped in it. Threads start 2 5/8" from the flange (and extend into the area that sheared off) Remainder of bolt is still in the bracket and captive nut so I can't see it at the moment.
"ABC" is a maker's mark. "9.8" is the Property Class (SAE does it with hash marks, plus two.) Read the Property Class as:

9.8 = 9x100MPa Ultimate Tensile Strength (UTS,) or 900MPa tension to fail. 8 = 80% yield load to a 0.2% permanent set, so you'd see a 0.2% permanent deformation at 720MPa. (1MPa = 0.1450377ksi, or thousand pounds per square inch. Therefore, 900MPa = 130.53393ksi or 130,533.92psi and 720MPa = 104.427144ksi or 104,427.144psi loading.)

The unthreaded portion of the screw is called the "grip" - and is present because screws are typically threaded to 3d, where d is the nominal diameter of the screw (screw will be threaded to roughly 42m/m from the tip. This does not usually count dog points, and is often rounded up to the next 1/8" - SAE - or 5m/m - ISO.)

I'm willing to be that the screw will have a dog or "pilot" point on it when you get the rest of it extracted - this is common on OEM screws (which is why I don't get rid of them when I find them - unless they've failed.) Aftermarket screws are not typically made with dog points - they're usually special order items (long screws can be had fully-threaded, you have to order them as well. Fastenal should be able to supply you with screws of either variety.)
Reply With Quote
  #20  
Old June 22nd, 2010, 19:40
xjnewbi xjnewbi is offline
NAXJA Forum User
 
Join Date: Oct 2007
Location: Jersey Shore
Posts: 222
Smile Re: leaf spring bolt size PLEASE

Quote:
Originally Posted by 5-90 View Post
"ABC" is a maker's mark. "9.8" is the Property Class (SAE does it with hash marks, plus two.) Read the Property Class as:

9.8 = 9x100MPa Ultimate Tensile Strength (UTS,) or 900MPa tension to fail. 8 = 80% yield load to a 0.2% permanent set, so you'd see a 0.2% permanent deformation at 720MPa. (1MPa = 0.1450377ksi, or thousand pounds per square inch. Therefore, 900MPa = 130.53393ksi or 130,533.92psi and 720MPa = 104.427144ksi or 104,427.144psi loading.)

The unthreaded portion of the screw is called the "grip" - and is present because screws are typically threaded to 3d, where d is the nominal diameter of the screw (screw will be threaded to roughly 42m/m from the tip. This does not usually count dog points, and is often rounded up to the next 1/8" - SAE - or 5m/m - ISO.)
I don't know about anybody else, but I'm pretty friggin impressed!! I'm glad somebody knows what all that means - I've been schooled
Reply With Quote
  #21  
Old June 22nd, 2010, 20:06
5-90's Avatar
5-90 5-90 is offline
NAXJA Forum User
 
Join Date: Mar 2003
Location: Hammerspace
Posts: 18,799
Re: leaf spring bolt size PLEASE

Quote:
Originally Posted by xjnewbi View Post
I don't know about anybody else, but I'm pretty friggin impressed!! I'm glad somebody knows what all that means - I've been schooled
One of these days, I need to write that fastener primer I've been thinking of. I know BillAVista did one over at Pirate, but I think some things could have been explained a bit better, and he could have gone more into the "Hows and Whys" of it all as well (nothin' personal Bill - you've done damned good work as it is!)

All I can say for now is to keep an eye on my Tech section - I can't schedule the updates (since my wife has been getting parts replaced of late, that's taken a good deal of my time...) but they're in the pipe!
Reply With Quote
  #22  
Old June 26th, 2010, 14:47
xjnewbi xjnewbi is offline
NAXJA Forum User
 
Join Date: Oct 2007
Location: Jersey Shore
Posts: 222
Re: leaf spring bolt size PLEASE

OK - update: finally got the bolt cut and extracted (with the nut) from inside the mounting bracket pocket. A little fighting with the spring to get the new bolt in, taped the new nut to a 21mm wrench and slipped it into the pocket, tightened everything down.

Thanks to everyone who contributed info on this thread. Just FYI, this is the part list that I used:

M14-2.0x110mm class 10.9 flange head nipple tip bolt. I purchased this through teamcherokee.com, set of 2 bolts for $11 with shipping. They are listed on their site as LCA bolts. I should mention that stock leaf spring mounting bolts are 120mm long but the 110mm has more than enough thread (good 3/4" of bolt threaded through the nut)

6102251-AA hex nut F 17015030 from my local Chrysler dealership - $5.89 for a friggin nut!!
Reply With Quote
  #23  
Old March 30th, 2011, 18:28
ehall's Avatar
ehall ehall is offline
NAXJA Member
 
Join Date: Dec 2007
Location: Southern Maryland
Posts: 8,902
Re: leaf spring bolt size PLEASE

This thread has the most info so I'm adding this pic here. Top is an LCA bolt, bottom is a leaf bolt from a 91. They look quite different but they are only 1cm different in length (the nipple on the end of the leaf bolt adds to the illusion).



Also notice the deeper shoulder on the LCA bolt.
__________________
.
my '91 beater rebuild
Reply With Quote
  #24  
Old March 30th, 2011, 19:35
5-90's Avatar
5-90 5-90 is offline
NAXJA Forum User
 
Join Date: Mar 2003
Location: Hammerspace
Posts: 18,799
Re: leaf spring bolt size PLEASE

Quote:
Originally Posted by xjnewbi View Post
I don't think this will help much, but my stock bolt is a hex flange head with "ABC 9.8" stamped in it. Threads start 2 5/8" from the flange (and extend into the area that sheared off) Remainder of bolt is still in the bracket and captive nut so I can't see it at the moment.
"ABC" is a manufacturer's mark, "9.8" is the ISO Property Class of the bolt. Ergo, it's metric - which means that the use of ISO hardware does go back to 1987 - maybe even 1984. It would make sense - since the early 1980's were the transitional time for US automakers to start using ISO hardware in the body assembly anyhow (engines took a while longer - they probably didn't want to change the tooling overmuch...)
Reply With Quote
  #25  
Old March 30th, 2011, 20:57
kastein kastein is offline
NAXJA Forum User
 
Join Date: Jul 2009
Location: Central MA - keep going till the road turns to dirt, then listen for banjos
Posts: 14,009
Re: leaf spring bolt size PLEASE

Now I'm too curious... ehall posted a pic of LCA and spring bolts from his 91 XJ. But I know for a fact that the LCA bolts from my 91 MJ look just like every other LCA and spring bolt I've ever seen. Time to investigate further.

(if a part number is new for that year, I've bolded it, so you can follow the changes more easily)

84-86:
LCA bolt - 3420 1334
LCA nut - 1150 2814
spring bolt - 3420 1392
spring nut - 1150 2814

87-90:
LCA bolt - 3420 1392 note: now the same as the spring bolts from previous split
LCA nut - 1150 2814
spring bolt - 3420 2118 note: entirely new part
spring nut - 1150 2814

91-96:
LCA bolt - 3420 2118 note: now the same as the spring bolts from previous split
LCA nut - 1150 2814
spring bolt - 3420 2118
spring nut - 1150 2814

97-99:
LCA bolt - 3420 1334 wtf?! back to the 84-86 part number!
LCA nut - 1150 2814
spring bolt - 3420 2118
spring nut - 1150 2814

00:
LCA bolt - 3420 1334
LCA nut - 0650 3672
spring bolt - 3420 2118
spring nut - 1150 2814

01:
LCA bolt - 3420 1334
LCA nut - 0650 3672
spring bolt - 3420 2118
spring nut - 0650 3672 note: same nuts as used on LCA bolts previous split

As usual when dealing with Chrysler I'm left saying "uh... but... um... WHY?!" It appears they simply changed random bolts back and forth from different lengths to other lengths over the entire production run. Some of these parts, like the nuts, are exactly the same, others, like the bolts (1334 vs 2118) differ in length by 10mm. I have no idea why ehall ended up with 110mm LCA bolts and 120mm leaf bolts, the 110mm bolts supposedly hadn't been used since '86 and weren't going to be used again till '97. And my '98 has 120mm bolts in all locations, while the listings show 110mm LCA bolts... I can only conclude that the factory was on crack (likely) and/or the Chrysler official OEM book of lies is nearly as bad as the Haynes book of lies (also likely.)
Reply With Quote
  #26  
Old March 30th, 2011, 21:29
ehall's Avatar
ehall ehall is offline
NAXJA Member
 
Join Date: Dec 2007
Location: Southern Maryland
Posts: 8,902
Re: leaf spring bolt size PLEASE

Oh I forgot, mine was hit sideways and the rearend was knocked off. The axle and springs were all replaced before I got it.

FWIW the LCA bolt in that pic came from the junkyard.
__________________
.
my '91 beater rebuild
Reply With Quote
  #27  
Old April 3rd, 2017, 10:46
aequitas12 aequitas12 is offline
NAXJA Forum User
 
Join Date: Apr 2017
Location: columbus ohio
Posts: 3
Re: leaf spring bolt size PLEASE

I know this is an old thread but was relevant to me as i just snapped one putting on my lift kit, for ease of ordering this bolt is part number 34202118 and you should be able to order it from any chrysler dealer. i paid @7 bucks and got 4 because i really did not want to reuse the other rusted factory bolts.
Reply With Quote
  #28  
Old April 22nd, 2017, 13:55
Whaler Whaler is offline
NAXJA Forum User
 
Join Date: Oct 2014
Location: Nantucket, MA
Posts: 10
Re: leaf spring bolt size PLEASE

Quote:
Originally Posted by xjnewbi View Post
I found an OEM replacement on teamcherokee.com - as kastein mentioned, the same bolt as the LCA mounting bolt. The bolts look identical - sold in pairs $7 and $4 ship/handle. Pricey for 2 bolts but it will cost me more in gas to get to my nearest junkyard to wrestle a rusted to hell bolt out. I'll let you know how it works when they come in.
I love . Seven years later and you just saved me $35 and lead me to teamcherokee.com, which is a great resource. Thanks!
Reply With Quote
  #29  
Old April 22nd, 2017, 14:26
Anak's Avatar
Anak Anak is offline
Mostly Harmless
 
Join Date: Sep 2013
Location: SoCal
Posts: 2,173
Re: leaf spring bolt size PLEASE

Be cautious about Team Cherokee.

Experiences with them in the recent past have not been encouraging.


http://www.naxja.org/forum/showthrea...=team+cherokee

No first hand experience myself, but I have seen enough to make me wary. You can do a search for more reviews of them and see if the picture has been improving of late. Or not.
__________________
Project "Scope Creep": 1996 4wd 4.0L, AX15
Reply With Quote
  #30  
Old May 1st, 2017, 16:53
kastein kastein is offline
NAXJA Forum User
 
Join Date: Jul 2009
Location: Central MA - keep going till the road turns to dirt, then listen for banjos
Posts: 14,009
Re: leaf spring bolt size PLEASE

Quote:
Originally Posted by Anak View Post
Be cautious about Team Cherokee.

Experiences with them in the recent past have not been encouraging.


http://www.naxja.org/forum/showthrea...=team+cherokee

No first hand experience myself, but I have seen enough to make me wary. You can do a search for more reviews of them and see if the picture has been improving of late. Or not.
Agreed. A few years ago I told one of my friends they were alright to buy from and they proceeded to sell him poorly fitting, poorly manufactured rugged ridge junk as "new old stock" (that's how it was listed on their site.) The rubber dry rotted and cracked within a year and they told him to take a hike when he called to complain.

I recommend buying from literally anyone other than TC/TGW as a result.
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
How do i get a leaf spring bolt out, 92XJR3D Modified Tech Discussion 6 January 25th, 2013 12:11
Leaf spring bolt size cjsxj87 OEM Tech Discussion 3 December 29th, 2009 11:56
Leaf spring bolt? Harlee&Tahoe OEM Tech Discussion 2 June 22nd, 2007 13:22
leaf spring bolt and spring clamp replacement? cjben Modified Tech Discussion 6 December 27th, 2006 14:06
Leaf Spring Bolt Size? xj92 Modified Tech Discussion 4 July 15th, 2004 10:11


All times are GMT -7. The time now is 03:28.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
NAXJA and NAXJA logo's Copyright NAXJA. All content/images Copyright NAXJA 1999-2014