james750 Posted November 26, 2008 Share Posted November 26, 2008 Back in the accident 3 weeks ago all of the front bumper bolts sheared off inside the holes. Ive tried eazy outs, but they won't work (break off inside bolts) I took care of the front 2 bolts by breaking off the welded nuts. but the bolt in the back is whats troubling me. I need to install a new bumper and want to use all of the bolts with this bumper, but what should I do to get to the nut on the other side or to extract the bolt? If the nut does break off what are my options for a new bolt. From what I saw there wasn't any access to the nut? What do u guys think I should do? Thanks, James Link to comment Share on other sites More sharing options...
hogelectra Posted November 26, 2008 Share Posted November 26, 2008 The nut is it a regular nut or a nutsert/rivetnut? Everywhere I turn my MJ has nutserts/rivetnuts - I just bought a bynch myself for repair work. Link to comment Share on other sites More sharing options...
Pete M Posted November 26, 2008 Share Posted November 26, 2008 Meh,, the stock bumper bolts are only there to keep the stock bumper from falling off on the freeway. I'd probably just skip it. Or better yet, buy/make a better one. :yes: Link to comment Share on other sites More sharing options...
project88mj Posted November 26, 2008 Share Posted November 26, 2008 to get to old ones do as i did and take your time with a cutting torch and build a new bumper to put on there Link to comment Share on other sites More sharing options...
james750 Posted November 26, 2008 Author Share Posted November 26, 2008 I think it is a nut. It is the JCR prerunner bumper that is going on and I did get the unibody tie in brackets but with these brackets it relies on the bumper with the 3 stock mounting bolts on the bracket welded to the bumper and then the tie in brackets extend from the front three bolts back to the frame tie in points. I Just don't know if it is necessary to have the 3rd bolt in order for this to work properly. The bumper will be seeing a winch (mounted to 2" reciever) and will get extensive use out of the d rings. Is this even something to be concerned about or should I just leave it with the 2 front nuts/bolts? Do I need to use grade 8 bolts in the front? What grade were the stock mounting bolts? I want something that will hold for the needed pulling and pushing but also want the bolts to shear off again if another idiot crashes into me. That saved the frame from damage in this last accident. Sorry about having so many questions, just not sure what I need to do to mount this bumper properly. Link to comment Share on other sites More sharing options...
jbhill Posted November 26, 2008 Share Posted November 26, 2008 i would assume the factorys were metric grade 10.9 which is stronger then grade 8. you could punch out the factory nut and drill a hole to the inside rail and run a long bolt through it. Link to comment Share on other sites More sharing options...
james750 Posted November 29, 2008 Author Share Posted November 29, 2008 Is this something I should even worry about? IDK if that 3rd bolt in the back is crucial to holding the new bumper on during towing/pulling/winching, or if I just have 2 on each side holding it onto the front crossmember and frame tie in brackets will work just fine? :hmm: Link to comment Share on other sites More sharing options...
Pete M Posted November 29, 2008 Share Posted November 29, 2008 For what it's worth, I don't use those front 3 holes at all. I use 3 grade 8 bolts (1/2" or bigger) per side and none of the factory bumper spots. Link to comment Share on other sites More sharing options...
james750 Posted November 29, 2008 Author Share Posted November 29, 2008 I'd like to do that, but with this bumper the bracket that is on it only has the 3 front holes on it and it uses frame tie in brackets to make it work. Here is the bumper: http://www.jcroffroad.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=1XJFPRE&Category_Code=XJB These are the tie in brackets: http://www.jcroffroad.com/xjuniframe.html I would just weld the tie in brackets onto the bumper, but I have no welder/welding skills and it voids the warranty to modify the bumper or brackets. Link to comment Share on other sites More sharing options...
Pete M Posted November 29, 2008 Share Posted November 29, 2008 Looks like the frame tie-in brackets have a whole bunch of holes in them. I'd personally prefer the tie ins be welded to the bumper than worry about the warranty, but I understand your concern. I think you should be fine with the JCR tie ins. Are you sure JCR would void the warranty on a JRC bumper if you welded the JCR brackets to them? I didn't see anything about that on the site, but admittedly I didn't look all that hard.. Link to comment Share on other sites More sharing options...
Eagle Posted November 29, 2008 Share Posted November 29, 2008 Is this something I should even worry about? IDK if that 3rd bolt in the back is crucial to holding the new bumper on during towing/pulling/winching, or if I just have 2 on each side holding it onto the front crossmember and frame tie in brackets will work just fine? :hmm: It certainly is something to worry about. If you look at the factory tow hook brackets (which are the same brackets used with the old factory "Hidden Winch" option), I believe they used all the original bumper mounting bolts plus added two or three more on each side. And the hidden winch was only a 5,000 or 6,000 pound winch. Drill out the bolts if you can, or grind off the old nuts and tack weld new ones in their place. Link to comment Share on other sites More sharing options...
james750 Posted November 29, 2008 Author Share Posted November 29, 2008 How do I access the old nut? I thought it was enclosed in the frame rail and out of reach? Link to comment Share on other sites More sharing options...
james750 Posted November 29, 2008 Author Share Posted November 29, 2008 Any modifications made to any of these products will void the warranty. That is on the warranty page of the website. Link to comment Share on other sites More sharing options...
Pete M Posted November 29, 2008 Share Posted November 29, 2008 Have you asked them about it? It might fly since it's all their stuff. Link to comment Share on other sites More sharing options...
james750 Posted November 30, 2008 Author Share Posted November 30, 2008 ok, spent all day on this now, and it payed off. i was able to drill it out and use a screw extractor thing I found at carquest (not a like a normal easy out, but it is a square shape with little cutters on the ends) and I use that to cut out the remaining wall of the screw so that the remaining screw was cut into 4 pieces. Then I used a flat blade screwdriver and a hammer to tap out the 4 pieces of screw. It worked on both sides and the nut in the frame rail is still usable. :banana: Link to comment Share on other sites More sharing options...
Eagle Posted November 30, 2008 Share Posted November 30, 2008 Excellent! "I love it when a plan comes together" (Colonel Hannibal Smith, "The A-Team") Link to comment Share on other sites More sharing options...
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