JP Posted January 6, 2012 Share Posted January 6, 2012 1972 Spitfire MkIVWhilst bleeding my brakes after a bit of a rebuild of the car I found my bleed screw on the caliper keep turning and turning when tightening.On closer inspection the thread is shot on the caliper as well as the bleed screw :(Any ideas if I can fix these? re-tap with a bigger thread and new bleed nipple perhaps? though finding a bleed nipple with the crazy long reach of these babies could prove quite a task as they are twice the length of some porsche ones I had kicking around.Am reluctant to junk the caliper as other than this it works well re pistons and fitted new rubbers. Any advice greatly received. Link to comment Share on other sites More sharing options...
junkuser Posted January 6, 2012 Share Posted January 6, 2012 ? Helicoil or equivalent. Link to comment Share on other sites More sharing options...
JP Posted January 6, 2012 Author Share Posted January 6, 2012 Was wondering whether helicoil might be the way but never done it before, I'm guessing I'd need one of these and one of these ?or maybe this kit will do the trick, slightly cheaper than a new caliper and can always flog it on again after. Link to comment Share on other sites More sharing options...
junkuser Posted January 6, 2012 Share Posted January 6, 2012 Unfortunately you require their special tap and their inserting tool as well. Sold as a kit.There are other brands that are satisfactory and may be cheaper. Re-Coil is one, probably others. Try something like "thread repair" on Google.They are quite easy to use.Possibly someone could loan you the tap and inserting tool so you would only have to purchase the inserts and give the spares to whoever loaned you the gear. Link to comment Share on other sites More sharing options...
nang Posted January 6, 2012 Share Posted January 6, 2012 Trouble is you've got to get it dead straight so that the taper on the bleed nipple seats in the countersunk part of the caliper to form a fluid tight seal. Sorry, but I doubt if will be satisfactory with a helecoil.Tony. Link to comment Share on other sites More sharing options...
junkuser Posted January 6, 2012 Share Posted January 6, 2012 Agree you have to be accurate but the ace up the sleeve is the clearance in the thread which should allow the taper on the end of the valve to bring it into line in use unless badly out.I feel there is a better chance of success than trying to tap it to a larger size.Of course I could be well wrong. Link to comment Share on other sites More sharing options...
piman Posted January 6, 2012 Share Posted January 6, 2012 Hello JP,yes the Recoil kits are good and have everything you need in them and at a reasonable cost.There should be no problems as the recoil tap will follow the original drilling.Alec Link to comment Share on other sites More sharing options...
JP Posted January 6, 2012 Author Share Posted January 6, 2012 piman wrote:Hello JP,yes the Recoil kits are good and have everything you need in them and at a reasonable cost.There should be no problems as the recoil tap will follow the original drilling.AlecSorry for my ignorance but is a recoil kit different to the helicoil kit I linked to above ? Many thanks for all the responses Link to comment Share on other sites More sharing options...
Richard B Posted January 6, 2012 Share Posted January 6, 2012 JP wrote:Sorry for my ignorance but is a recoil kit different to the helicoil kit I linked to above ? Helicoil is a tradename, but like Hoover it has become synonymous with the generic product.Recoil is another make, usually a bit cheaper than Helicoil. Most of the kits I own are made by Recoil. Link to comment Share on other sites More sharing options...
piman Posted January 6, 2012 Share Posted January 6, 2012 Hello JP, the links you gave are for Recoil type inserts. Helicoils had a special adapter that you put the insert into first before it is screwed into the component being repaired. Here is a link for a Helicoil.:-http://www.buckandhickman.com/find/keyword-is-wcx/Price-is-50-to-100/product-is-103705BAlec Link to comment Share on other sites More sharing options...
JP Posted January 6, 2012 Author Share Posted January 6, 2012 Sorry meant this kit rather than the stuff I put in the first post.That kit you posted looks nice but a little out of my budget :( Link to comment Share on other sites More sharing options...
IVANHOE Posted January 6, 2012 Share Posted January 6, 2012 Same happened to me a while back. The machinest at work made me a collar with the original thread inside and the next size up thread on the outside, cant remember the sizes now. I do remember however that the casting was a sod to drill and tap, the metal was crumbling away like powder. I managed to get just enough thread and lock tighted the collar in, it worked and has been fine for over 12 months, inc. RBRR.On ebay some one in usa does a similar collar for Harley Davidson callipers.190613598556 Link to comment Share on other sites More sharing options...
JP Posted January 6, 2012 Author Share Posted January 6, 2012 Interesting so I might be able to use one of THESE then? Link to comment Share on other sites More sharing options...
IVANHOE Posted January 6, 2012 Share Posted January 6, 2012 Good find jp................... but I think the wall thickness is a tad too thick, making the outside diameter too big......... I think you will find that there isn't much room in the calliper casting. I will ask the machinist at work if he still has the program that he used for mine............ it's a long shot but if he has the info still and could squeeze one into his workload I'll sort one for you. Link to comment Share on other sites More sharing options...
JP Posted January 6, 2012 Author Share Posted January 6, 2012 187 wrote:Good find jp................... but I think the wall thickness is a tad too thick, making the outside diameter too big......... I think you will find that there isn't much room in the calliper casting. I will ask the machinist at work if he still has the program that he used for mine............ it's a long shot but if he has the info still and could squeeze one into his workload I'll sort one for you.Cheers for the offer much appreciated but I've gone for the recoil kit so fingers crossed it'll do the trick. I'll report back and if anyone else needs to borrow it let me know.Thanks a lot for all your help much appreciated Link to comment Share on other sites More sharing options...
bob dunn Posted January 6, 2012 Share Posted January 6, 2012 just a thought is the thread from the bleed screw in the caliper, if so clean it out. another plan is to block up the thread plastic metal a bolt in then use the supply pipe to pressure bleed , soak up with a towel . Link to comment Share on other sites More sharing options...
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