broke leaf spring center pin - Pirate4x4.Com : 4x4 and Off-Road Forum
 
Pirate4x4.Com : 4x4 and Off-Road Forum  

Go Back   Pirate4x4.Com : 4x4 and Off-Road Forum > Brand Specific Tech > Jeep - Non Hardcore
Notices

Reply
 
Share LinkBack Thread Tools Display Modes
Old 04-07-2008, 10:40 PM   #1 (permalink)
Registered User
 
Join Date: Apr 2008
Member # 112037
Location: San Diego
Posts: 41
broke leaf spring center pin

I have a procomp 4" SUA lift. Going down a dirt road aproching the trail head I broke the center pin in one of the rear spring packs. A new spring pack is out of the budget right now and kinda a waste because I plan on doing a SOA conversion in a few months. How to I repair the broken spring pack? It has all the leafs, just need a new center pin.Thanks
Strepz is offline   Reply With Quote Quick reply to this message
Old 04-07-2008, 10:44 PM   #2 (permalink)
Registered User
 
Join Date: Mar 2003
Member # 17632
Location: West Sacramento, CA
Posts: 8,361
Go to the 4x4 shop or speed shop for that matter and buy replacement center bolts. Make sure you torque your u-bolts to prevent this in the future.
Travis..
__________________
18 Ram 2500 4x4 Big C and a 6 speed
73 Dodge W100, 400 4spd, stepside project
crashnzuk is offline   Reply With Quote Quick reply to this message
Sponsored Links
Old 04-07-2008, 10:55 PM   #3 (permalink)
Registered User
 
Join Date: Apr 2008
Member # 112037
Location: San Diego
Posts: 41
what torque value should I use? I had them pretty tight before.
Strepz is offline   Reply With Quote Quick reply to this message
 
Old 04-08-2008, 06:51 AM   #4 (permalink)
Registered User
 
Join Date: Mar 2001
Member # 3511
Location: MN
Posts: 11,672
Or just take a grade 8 bolt that fits the spring pack hole and grind the head round.
__________________
Chuck P
A man can do all things if he will
oldjeep is offline   Reply With Quote Quick reply to this message
Old 04-08-2008, 08:06 AM   #5 (permalink)
Registered User
 
hitech_hick's Avatar
 
Join Date: Dec 2005
Member # 62866
Location: Madison, WI
Posts: 358
How exactly does one go about breaking a centering pin while driving? Definitely need to torque your u-bolts down to spec.



hick
__________________
'97 XJ, D30, Ford 8.8, 35's
'94 Mazda B4000, D35 TTB, Ford 8.8, 35's
hitech_hick is offline   Reply With Quote Quick reply to this message
Old 04-08-2008, 08:36 AM   #6 (permalink)
Registered User
 
Join Date: Jun 2003
Member # 20092
Location: Porker, CO
Posts: 4,695
Quote:
Originally Posted by Strepz View Post
what torque value should I use? I had them pretty tight before.
A lot. torque them down until you see visible deformation of the plate, and then check them again after the next trip.

If the ubolts are too loose, the axle will walk around and snap the head off the bolt.

Also throw a spare in your tool box for the next time it happens on the trail.
__________________
'94 Toyota Land Cruiser FJZ80 - Vortec L33 5.3l, 4L60e, elocked, 3" OME lift, 315 KM2s, Warn 8074.
rock-rod is offline   Reply With Quote Quick reply to this message
Old 04-08-2008, 06:57 PM   #7 (permalink)
Registered User
 
Join Date: Mar 2003
Member # 17632
Location: West Sacramento, CA
Posts: 8,361
Don't just tighten them, use a torque wrench. Do not use an impact either, use a torque wrench. Find out what the spec is from a service manual.
Travis..
__________________
18 Ram 2500 4x4 Big C and a 6 speed
73 Dodge W100, 400 4spd, stepside project
crashnzuk is offline   Reply With Quote Quick reply to this message
Old 04-09-2008, 12:33 AM   #8 (permalink)
Registered User
 
Join Date: Oct 2004
Member # 37427
Location: Houston, TX
Posts: 272
If you've got a lot of free time on your hands you can slightly oversize your center pin holes in each individual leaf and run the larger diameter 3/4 ton center pins. After a couple hours with a round file(good luck drilling spring steel) and upgrading to the larger center pins, I never had another problem.

Also, when you're torquing you're U-bolts, make sure your spring plates aren't just bending. I've seen inadequate spring plates made out of 1/4" flat mild steel that just bend without achieving the appropriate clamping force.
__________________
2013 Powerstroke
1997 FJ80
MITman is offline   Reply With Quote Quick reply to this message
Old 04-09-2008, 06:36 AM   #9 (permalink)
Registered User
 
hitech_hick's Avatar
 
Join Date: Dec 2005
Member # 62866
Location: Madison, WI
Posts: 358
Quote:
Originally Posted by MITman View Post
If you've got a lot of free time on your hands you can slightly oversize your center pin holes in each individual leaf and run the larger diameter 3/4 ton center pins. After a couple hours with a round file(good luck drilling spring steel) and upgrading to the larger center pins, I never had another problem.

Also, when you're torquing you're U-bolts, make sure your spring plates aren't just bending. I've seen inadequate spring plates made out of 1/4" flat mild steel that just bend without achieving the appropriate clamping force.
You can drill spring steel, I would just recommend a drill press, lots of cutting fluid, and going as slow as possible. I used some grade 8 bolts last time that I rounded the heads off using a grinder, worked great...


hick
__________________
'97 XJ, D30, Ford 8.8, 35's
'94 Mazda B4000, D35 TTB, Ford 8.8, 35's
hitech_hick is offline   Reply With Quote Quick reply to this message
Old 04-09-2008, 08:26 AM   #10 (permalink)
Registered User
 
Join Date: Oct 2007
Member # 101942
Location: Between the Hedges.....
Posts: 2,199
check and tighten your suspension bolts b4 every ride,i usually go over everything that can or could need tightening b4 each trip
xjemily is offline   Reply With Quote Quick reply to this message
Old 04-09-2008, 12:19 PM   #11 (permalink)
Registered User
 
Join Date: Nov 2005
Member # 57166
Location: puyallup Wa
Posts: 570
Quote:
Originally Posted by oldjeep View Post
Or just take a grade 8 bolt that fits the spring pack hole and grind the head round.
lol.. buddy broke one at the trail head and didn't have a spare. we took a hammer and beat the hex on a bolt until it was round using my rear bumper as an anvil. then we went wheeling!
__________________
87 pathfinder
HPD44 wristed radius arm, yukons, super joints, detroit
True hi9 spooled 4 link 5.38's
WH variable rate coils on all 4.
87 pathy is offline   Reply With Quote Quick reply to this message
Old 04-09-2008, 01:51 PM   #12 (permalink)
Registered User
 
Join Date: Dec 2006
Member # 83869
Location: Alta CA
Posts: 36
Send a message via MSN to zuch95701
Quote:
Originally Posted by xjemily View Post
check and tighten your suspension bolts b4 every ride,i usually go over everything that can or could need tightening b4 each trip
just daily driving my xj i still have to tighten those u bolts ever mounth or so

fyi the tork speck is 85ftlbs
zuch95701 is offline   Reply With Quote Quick reply to this message
Old 04-09-2008, 02:06 PM   #13 (permalink)
Registered User
 
doodah's Avatar
 
Join Date: Jan 2005
Member # 41941
Posts: 104
I used grade 8 cap screws (I think that is what they are called) that I got from Lowe's. They are round and have an allen head, plus they are just a little bigger (head wise) than the original pins were.
doodah is offline   Reply With Quote Quick reply to this message
Old 04-09-2008, 09:50 PM   #14 (permalink)
Registered User
 
Join Date: Mar 2006
Member # 69326
Location: Central CA
Posts: 59
Quote:
Originally Posted by doodah View Post
I used grade 8 cap screws (I think that is what they are called) that I got from Lowe's. They are round and have an allen head, plus they are just a little bigger (head wise) than the original pins were.
Had the same problem with a RE 4" kit. I used the same bolts as doodah. As far as U bolts, I replaced the old and cinched down with a breaker bar until tight. After a day of wheeling went back under the Jeep and ciched again with breaker bar. Don't tighten the U bolts to breaking point, but get them TIGHT.

I think the main problem they broke was the first time it happened I didn't have the U bolts tight enough. I listened onlined and cranked to 80-100 lbs with a torque wrench. Don't do this, just get the U bolts good and tight and you're good to go. Especially with pinon adjustment plates. Mine were steel and @ 8 degrees.
2oldtosk8 is offline   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Pirate4x4.Com : 4x4 and Off-Road Forum 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 email address for yourself.

** A VERIFICATION EMAIL IS SENT TO THIS ADDRESS TO COMPLETE REGISTRATION!! **

Email Address:
Insurance
Please select your insurance company (Optional)

Log-in


Thread Tools
Display Modes

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 On
Pingbacks are On
Refbacks are On



All times are GMT -7. The time now is 01:21 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.0 ©2011, Crawlability, Inc.
User Alert System provided by Advanced User Tagging (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.