Paul H Posted February 3, 2020 Report Share Posted February 3, 2020 Refitting the passenger door on my mk2 Vitesse . The fixing bolts are in a poor state and the thread has stripped on one of the sections on the retaining plate. Looking at the plate Is it too far for a thread recut or what size do I need to replace with . I’ve purchased replacement bolts but other than 3/8 don’t know what the full spec is . I know this was discussed on the forum recently but couldn’t find the info Paul Link to comment Share on other sites More sharing options...
Pete Lewis Posted February 3, 2020 Report Share Posted February 3, 2020 next size up is 3/8"x24 unf tapping drill at 8.3mm will need the hinge holes opening up to suit you could try a M8 x1.25 being a coarser thread can work or hole saw the A post inner closing and put a nut on the back might work these do get gorilla'd by over tightening the cage plate is not very thick easy to strip as youve found , pete 1 Link to comment Share on other sites More sharing options...
Paul H Posted February 3, 2020 Author Report Share Posted February 3, 2020 4 minutes ago, Pete Lewis said: next size up is 3/8"x24 unf tapping drill at 8.3mm will need the hinge holes opening up to suit you could try a M8 x1.25 being a coarser thread can work or hole saw the A post inner closing and put a nut on the back might work these do get gorilla'd by over tightening the cage plate is not very thick easy to strip as youve found , pete Thanks Pete , what size are the current bolts ? When you say M8 1.25 is this for the screwed up thread Paul Link to comment Share on other sites More sharing options...
Nick Jones Posted February 3, 2020 Report Share Posted February 3, 2020 They start off as 5/16 UNF. You could try M8x1.25 but you’ll not gain a lot I don’t think. Going up to 3/8UNF sorts the thread but the bigger bolt size limits the available adjustment. I helicoiled some of the holes on my GT6. Worked but not ideal as the insert comes out if given half a chance. Nick Link to comment Share on other sites More sharing options...
68vitesse Posted February 3, 2020 Report Share Posted February 3, 2020 50 minutes ago, Nick Jones said: I helicoiled some of the holes on my GT6. Worked but not ideal as the insert comes out if given half a chance. Nick Would a rivnut work better than a helicoil?. Regards Paul Link to comment Share on other sites More sharing options...
Peter Truman Posted February 3, 2020 Report Share Posted February 3, 2020 Nick I've heli-coiled a couple of hinge bolts, works well but also worried they may work out but as you seldom remove a door more frequently you only adjust they should be OK. Also just a thought would the captive plate locating/backing bracket stop the helocoil coming out to far Often wondered if the heli-coil was threadlocked in and let dry then run a tap thro it would that work. Peter T Link to comment Share on other sites More sharing options...
Nick Jones Posted February 3, 2020 Report Share Posted February 3, 2020 Problem was stopping them from going right through when you put the bolt in. I did try threadlock but it didn't work very well - possibly because the anaerobic conditions needed for cure were not met. A smear of epoxy followed by a tap once set would probably do it though. Ok now though and hopefully I won't need to mess them again as the door fit is nice. Nick Link to comment Share on other sites More sharing options...
Pete Lewis Posted February 4, 2020 Report Share Posted February 4, 2020 when tub was off i removed the cage plates and re drilled and tapped , still not very successful rivet nuts wont allow any cage plate movement still feel hole in inner a post and stick a nut on the back ...permanent fix wsm gives a low torque of 16-18 lbft no gorilla hands here pete 1 Link to comment Share on other sites More sharing options...
Pete Lewis Posted February 4, 2020 Report Share Posted February 4, 2020 The plate retaining cage is not easily modified to take a much thicker nut plate , this would be a good move but needs the tub off and access is hopeless its a tap it bigger, or back to a hole and poke a nut in a socket thro to find the end of the bolt ...in the dark pete Link to comment Share on other sites More sharing options...
Paul H Posted February 4, 2020 Author Report Share Posted February 4, 2020 21 minutes ago, Pete Lewis said: The plate retaining cage is not easily modified to take a much thicker nut plate , this would be a good move but needs the tub off and access is hopeless its a tap it bigger, or back to a hole and poke a nut in a socket thro to find the end of the bolt ...in the dark pete I’ve recut the threads , first time I’ve ever used a tap n die set [Xmas pressy] I’ve tested the new bolts without the door and pretty sure they will be ok . Door going back on now probably with some grunting and swearing Thanks for all input - appreciated Paul Link to comment Share on other sites More sharing options...
PeteH Posted February 24, 2020 Report Share Posted February 24, 2020 M12 (Coarse 1.75 pitch). Might tap?. The other option, carefully run weld into the Hole and re-tap?. Pete. Link to comment Share on other sites More sharing options...
RogerH Posted February 24, 2020 Report Share Posted February 24, 2020 Hi Folks, 'If' attaching a nut behind will work then so should a steel rivnut I would have thought. Easy to try and nothing to lose. Roger Link to comment Share on other sites More sharing options...
Paul H Posted February 24, 2020 Author Report Share Posted February 24, 2020 3 minutes ago, RogerH said: Hi Folks, 'If' attaching a nut behind will work then so should a steel rivnut I would have thought. Easy to try and nothing to lose. Roger Wont a rivnut affect the position of the hinge by acting as a washer Paul Link to comment Share on other sites More sharing options...
Pete Lewis Posted February 24, 2020 Report Share Posted February 24, 2020 all depends it the rivenut is clear of the plate nut cage or there will be no adjustment available same can apply to nut on back but in both cases the door must be adjusted /aligned before you lock it up or drill through the cage if needed head of rivenut is a valid idea otherwise try it Pete Link to comment Share on other sites More sharing options...
RogerH Posted February 24, 2020 Report Share Posted February 24, 2020 1 hour ago, Paul H said: Wont a rivnut affect the position of the hinge by acting as a washer Paul No. The top of the rivnut is no thicker than the skin that is already there. Or use a countersunk rivnut Roger Link to comment Share on other sites More sharing options...
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