Nick Manning Posted March 16, 2009 Report Share Posted March 16, 2009 I have had a look on the forum and various things about doing a helicoil, but i'm still clueless and not entirely sure if it will work with issue.My problem is on the non drive side 4 blot mount the bottom thread has been damaged. Recently when taking the bolt out it pulled some of the thread out of the top, the rest of the thread is fine, but I have had to run a longer bolt to be able bite whats left of the thread.Would a helicoil work on this and would it be recommended? Ifso, does anyone have a clue of what I need to do it and where to get it. Previous times when I worked for Halfords I just used a tap and die set and put a larger bolt in which sufficed. But I would like to try and keep it the same and not make it bigger. Quote Link to comment Share on other sites More sharing options...
forteh Posted March 16, 2009 Report Share Posted March 16, 2009 In one word. Yes You can buy a helicoil kit for about 15 quid which will contain about 20 inserts so you can do it at home for free; alternatively take the frame to a friendly local engineers and they may be able to put one in for the price of a couple of beers.Most decent tool/bearing shops should be able to get you a kit if they dont stock them, you will need a drill and preferably some oil to use as a tapping lubricant. Quote Link to comment Share on other sites More sharing options...
Nick Manning Posted March 16, 2009 Author Report Share Posted March 16, 2009 So like cutting lube?I assume its fairly simple/easy to do. I noticed that tarty can do this, but its the hassle of sending my frame up to them and back, it's £4.89 for them to do it, but then probably about another £20 in postage. Quote Link to comment Share on other sites More sharing options...
Luke Rainbird Posted March 16, 2009 Report Share Posted March 16, 2009 Helicoiling is just tapping a larger thread (like you've done before) then dropping an insert into it to restore the original size thread again. If you've tapped threads before helicoiling is a breeze, if you haven't it's still easy!You can grab yourself a kit for about £15 as has been said, or pop by a nearby garage/engineering firm and 99% of them should be able to help for next to nothing, it's a 2 minute job I borrowed a kit of Jon Mack a while back, as did Mr Pearson. I stocked it full of inserts before sending it back, so drop him a line perhaps and you could get it done for the price of posting the kit (about a pound each way!) Quote Link to comment Share on other sites More sharing options...
weirdoku Posted March 16, 2009 Report Share Posted March 16, 2009 Depending on how much thread you pulled out, it would be better to use a slightly longer bolt if possible. The thread inserts are only about 5mm long, so if you were to helicoil the mount you would only be able to put 5mm of new thread in, unless you can get longer thread inserts (which I'm not sure if you can). I have helicoiled 1 bolt hole on my old frame and all 4 on my friends frame, all which I only tapped to about 5mm deep as they all the holes had some thread left at the bottom. Helicoiling is easy, just follow the instructions and you'll be fine. Quote Link to comment Share on other sites More sharing options...
Nick Manning Posted March 16, 2009 Author Report Share Posted March 16, 2009 (edited) I read somewhere that Rich had used Jon's. Yeah I re-threaded one before but only to a larger size, but sounds fairly simple. Might try the local garage, or give Jon a pm, though I wouldn't mind purchasing a kit, has it seems pretty handle to have about. Any idea where I might be able to get one from Luke? Also what is the sizing I need, as I've looked on ebay and found quite a few but they all mention sizes.Well my thread is only damaged at the top, the rest of it down to the bottom is screwing fine. Edited March 16, 2009 by Nick Manning Quote Link to comment Share on other sites More sharing options...
weirdoku Posted March 16, 2009 Report Share Posted March 16, 2009 The size you'll need is M5x0.8. Quote Link to comment Share on other sites More sharing options...
Nick Manning Posted March 16, 2009 Author Report Share Posted March 16, 2009 (edited) Cheers.Would this be suitable? Ebay Edited March 16, 2009 by Nick Manning Quote Link to comment Share on other sites More sharing options...
Luke Rainbird Posted March 16, 2009 Report Share Posted March 16, 2009 eBay generally have a few about, I'll have a look in a minute for you.Standard maggie mounts are M5x0.8mm thread, and the kits are generally classified by the internal thread (ie. what you want to match the bolt), occasionally they'll be something like "M5 x 1D" or similar, meaning that they're an M5 thread, and the insert is 1 diameter long (about 5mm, in this case)edit; beaten to it!A 'coiled thread in alu is stronger than the original tapped thread, as a rule. Steel inserts are less likely to strip, so 5mm or so is plenty enough to hold a magura in place. If you were worried about there not being enough, and had room, you could always drop another insert on the top to double the thread area, though make sure you leave room to remove the tang or you'll have issuesedit 2; Nick, that's spot on Quote Link to comment Share on other sites More sharing options...
Nick Manning Posted March 16, 2009 Author Report Share Posted March 16, 2009 (edited) Tang? lol You've confused me again. Cool Edited March 16, 2009 by Nick Manning Quote Link to comment Share on other sites More sharing options...
weirdoku Posted March 16, 2009 Report Share Posted March 16, 2009 You probably need to buy a tap wrench seperately to use the tap if you haven't already got one, that's the only thing missing from the kits. Quote Link to comment Share on other sites More sharing options...
Luke Rainbird Posted March 16, 2009 Report Share Posted March 16, 2009 Tang? lol You've confused me again. CoolIf you look at the bottom of the insert, there's a bit of the coil which goes flat across the bottom. That's the tang. It's used to give something to grab hold of to screw in the insert, then snapped off once done so as not to get in the way of the bolt Quote Link to comment Share on other sites More sharing options...
Nick Manning Posted March 16, 2009 Author Report Share Posted March 16, 2009 You probably need to buy a tap wrench seperately to use the tap if you haven't already got one, that's the only thing missing from the kits.like this?If you look at the bottom of the insert, there's a bit of the coil which goes flat across the bottom. That's the tang. It's used to give something to grab hold of to screw in the insert, then snapped off once done so as not to get in the way of the bolt I see, makes sense. Quote Link to comment Share on other sites More sharing options...
weirdoku Posted March 16, 2009 Report Share Posted March 16, 2009 like this?Yes but this one seems better, I have one myself.Link Quote Link to comment Share on other sites More sharing options...
Nick Manning Posted March 16, 2009 Author Report Share Posted March 16, 2009 Yes but this one seems better, I have one myself.LinkCan't argue with that, lol.Thanks for all the help eeryone.It's all be wathced in my ebay, so when pay day comes ths week I wont forget what I wanted, lol. Quote Link to comment Share on other sites More sharing options...
weirdoku Posted March 16, 2009 Report Share Posted March 16, 2009 Be in portsmouth anytime soon? I have the kit if you want to burrow it. Quote Link to comment Share on other sites More sharing options...
Nick Manning Posted March 16, 2009 Author Report Share Posted March 16, 2009 Could perhaps pop down on Saturday, was gonna go shopping with the gf, so wouldn't actually be riding. Quote Link to comment Share on other sites More sharing options...
forteh Posted March 16, 2009 Report Share Posted March 16, 2009 If you dont have a tap wrench you can always use a small open ended spanner Quote Link to comment Share on other sites More sharing options...
weirdoku Posted March 16, 2009 Report Share Posted March 16, 2009 I'm always out riding on weekends anyway unless it's bad weather, if you do come down gimme a pm with what time and where you want to meet up etc. Quote Link to comment Share on other sites More sharing options...
Nick Manning Posted March 16, 2009 Author Report Share Posted March 16, 2009 I'm always out riding on weekends anyway unless it's bad weather, if you do come down gimme a pm with what time and where you want to meet up etc.ok cool, well I'l see what the plans are for the weekend and I'l let you know if I do come over that way. Quote Link to comment Share on other sites More sharing options...
George.E Posted March 17, 2009 Report Share Posted March 17, 2009 Tarty do a helicoil, its 15 quid for all four bolts. Quote Link to comment Share on other sites More sharing options...
Dave Anscombe Posted March 18, 2009 Report Share Posted March 18, 2009 Nick i got the lot.......drill bit tap and coil kit....il happily do it for you Dave...just send me a pm....its as simple as rooling a bifter Quote Link to comment Share on other sites More sharing options...
JonMack Posted March 18, 2009 Report Share Posted March 18, 2009 Rich still has mine, so if you give him a PM he might be able to send it on over to you Quote Link to comment Share on other sites More sharing options...
Nick Manning Posted March 18, 2009 Author Report Share Posted March 18, 2009 Tarty do a helicoil, its 15 quid for all four bolts.I only need the one ehich is £4.89, but then I still have to strip my bike and send it to tarty and get it sent back.Nick i got the lot.......drill bit tap and coil kit....il happily do it for you Dave...just send me a pm....its as simple as rooling a bifter Cheers Dave, as your living so close I think I'l take you up on that offer. Are yuou about this weekend?Rich still has mine, so if you give him a PM he might be able to send it on over to you Cheer's Jon, I'm gonna see Dave and get it done there, but thanks for the offer. Quote Link to comment Share on other sites More sharing options...
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