John L Posted March 12, 2008 Report Share Posted March 12, 2008 I have just had a kit back from the USA with a friend and on it says use a 21/64" drill this I think does go then to metric of 8.334 Hope that helps Regards John Quote Link to post Share on other sites
Ben Davies Posted March 12, 2008 Report Share Posted March 12, 2008 Guy, When I did mine last summer I used 5/16 UNC helicoils and studs that were UNC at one end (into the arm) and UNF the other (to take a standard nyloc). Loukas at the TR shop found these for me but Moss and others also supply them. I actually didn't drill out the holes in the trailing arm at all before cutting the new threads (I think I read to do it that way in a previous post on the forum). The old threads had been stripped out completely and with the arm being a fairly soft alloy it was very easy to cut the 5/16 thread straight into the existing hole. Use a light oil and go slowly - I was nervous about ruining the arms but it wasn't a difficult job in the end. Ben Quote Link to post Share on other sites
Mike G Posted March 12, 2008 Report Share Posted March 12, 2008 Guy I think you will find, the 1.5 refers to the length of the heli coil. It should be 1.5 times the dia, which should equate to 6 threads. As Ben has stated, I would not bother drilling out the stripped threads, in Aluminium, only in steel. The lubricant I have always used, for tapping out Aluminium, is diesel or paraffin; again I wouldn’t bother, but if you must, then use something like WD 40. Mike G Quote Link to post Share on other sites
Jersey Royal Posted March 12, 2008 Author Report Share Posted March 12, 2008 Thanks Ben ,Mike,John and Stuart, For your advice Have completed the drivers side, there was only one to replace. As was said, i didnt use a drill bit, just the tap insert, with a little lubricant, and by hand, cleaned out the swarf and remebered to knock off the tang. Now to the other two on other side Cheers Guy Quote Link to post Share on other sites
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