Natplant Posted January 9, 2021 Report Share Posted January 9, 2021 While doing a front suspension re-build, had great fun with the drop links, if it wasn’t for all the info on here I would never have got them off. When I have come to refit callipers I have noticed the thread is not great in the hub, has anyone got any recommendations on helicoil, I take it M12 x 1.5 but what length? Most say 16.3mm is this correct. Thanks In advance Link to comment Share on other sites More sharing options...
T11Mike Posted January 9, 2021 Report Share Posted January 9, 2021 Same length as the original bolt maybe ? Link to comment Share on other sites More sharing options...
Natplant Posted January 9, 2021 Author Report Share Posted January 9, 2021 Just now, T11Mike said: Same length as the original bolt maybe ? The original bolt is 72mm, but don’t know how much penetrates the thread Link to comment Share on other sites More sharing options...
T11Mike Posted January 9, 2021 Report Share Posted January 9, 2021 I would put the bolt through the caliper and measure how much is petruding behind it, that should give you the thread depth if im understaning your enquiry correctly. Link to comment Share on other sites More sharing options...
AMacdonald Posted January 9, 2021 Report Share Posted January 9, 2021 I'm sure I read somewhere that there is no benefit to having a coil longer than the diameter of the bolt. Link to comment Share on other sites More sharing options...
T11Mike Posted January 9, 2021 Report Share Posted January 9, 2021 There is no benefit but no harm is caused by it petruding through the hub/not coming into contact with anything. Link to comment Share on other sites More sharing options...
Jim b Posted January 9, 2021 Report Share Posted January 9, 2021 On 1/30/2019 at 8:54 PM, Jim b said: Decided it was time to replace front discs and pads as it was advisory on past mot, and skim rear ones as they weren't to bad. Rears went really well only removed 0.5mm to clean them up, finished at 23.5mm with minimum being 22mm. New bolts used and everything went to plan. Caliper bolts on front right were seized, so applied heat and penetrating oil, unfortunately threaded hole was slightly damaged. Made a jig and drilled then taped hole and inserted a helicol to return to M12 x 1.5p. All up and running now. Replaced discs a couple of years ago and needed to helicoil the hub one side. Noticed your local, so if you need to borrow jig I made to drill and tap them, let me know and I will see if I can dig it out. Jim Link to comment Share on other sites More sharing options...
Natplant Posted January 9, 2021 Author Report Share Posted January 9, 2021 29 minutes ago, Jim b said: Replaced discs a couple of years ago and needed to helicoil the hub one side. Noticed your local, so if you need to borrow jig I made to drill and tap them, let me know and I will see if I can dig it out. Jim Thanks, I’ve ordered a helicoil set and new bolts, I’ve removed the hub so I can use my stand drill, I’m hopeful it will drill ok, I’ll be in touch if I struggle. Link to comment Share on other sites More sharing options...
Jim b Posted January 9, 2021 Report Share Posted January 9, 2021 A lot easier to drill on bench, hope it goes well. Link to comment Share on other sites More sharing options...
Natplant Posted January 9, 2021 Author Report Share Posted January 9, 2021 1 minute ago, Jim b said: A lot easier to drill on bench, hope it goes well. Thanks fingers crossed all will go well Link to comment Share on other sites More sharing options...
½cwt Posted January 9, 2021 Report Share Posted January 9, 2021 Helicoils come in lengths related to diameters 0.75D, 1D, 1.5D, 2D, however in pure engineering terms anything more than 6 full turns of thread engagement is of no additional benefit so on M12 x 1.5 it would be a 9mm or 0.75D helicoli insert minimum. That said for this application and the depth of the threaded hole in the upright a 1.5D insert might be better. Link to comment Share on other sites More sharing options...
Natplant Posted January 10, 2021 Author Report Share Posted January 10, 2021 19 minutes ago, ½cwt said: Helicoils come in lengths related to diameters 0.75D, 1D, 1.5D, 2D, however in pure engineering terms anything more than 6 full turns of thread engagement is of no additional benefit so on M12 x 1.5 it would be a 9mm or 0.75D helicoli insert minimum. That said for this application and the depth of the threaded hole in the upright a 1.5D insert might be better. Thanks, that’s what I’ve ordered M12 x 1.5 x 1.5D Link to comment Share on other sites More sharing options...
bally4563 Posted January 10, 2021 Report Share Posted January 10, 2021 12 hours ago, AMacdonald said: I'm sure I read somewhere that there is no benefit to having a coil longer than the diameter of the bolt. +1 Link to comment Share on other sites More sharing options...
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