RogerH Posted September 19, 2020 Report Share Posted September 19, 2020 16 minutes ago, Richmac said: Thanks Mick. Yes the 6 nylon nuts holding assembly into the trailing arm is what I am doing. Its not clear in the WSM. 16ib doesn't sound very much but thanks for confirming that for me. Regards Richard Hi Richard, the major force on these studs is a shear force. Very little force is trying to pull the studs out. The torque figure can't be high as this would simply strip the Ali thread. So TRiumph used a UNF thread (very clever). This thread form has less tendency to unscrew. Usually UNC is used in soft material but can undo if not torqued to a higher degree. Roger Quote Link to post Share on other sites
Richmac Posted September 19, 2020 Author Report Share Posted September 19, 2020 Thanks Roger. A free lesson in engineering. Why though do they want to use an soft material like Ali? This must have less of a resistance to shear force as well? I have dug out an old torque wrench I never thought I would use but had to convert to NM (21.693087173) Should be able to get that spot on then!! Quote Link to post Share on other sites
John McCormack Posted September 21, 2020 Report Share Posted September 21, 2020 On 9/20/2020 at 1:19 AM, Richmac said: Thanks Roger. A free lesson in engineering. Why though do they want to use an soft material like Ali? This must have less of a resistance to shear force as well? I have dug out an old torque wrench I never thought I would use but had to convert to NM (21.693087173) Should be able to get that spot on then!! Torque wrenches aren't expensive and can age, especially with misuse. I bought a new one and borrowed an engineering one and when I compared them all found my old one was out quite a long way. They are an essential item in the tool box of a TR owner. Quote Link to post Share on other sites
Motorsport Mickey Posted September 21, 2020 Report Share Posted September 21, 2020 On 9/19/2020 at 4:19 PM, Richmac said: Thanks Roger. A free lesson in engineering. Why though do they want to use an soft material like Ali? This must have less of a resistance to shear force as well? I have dug out an old torque wrench I never thought I would use but had to convert to NM (21.693087173) Should be able to get that spot on then!! Because if they tried to make these trailing arms out of steel you would need a 3 litre engine too pull them ! Mick Richards Quote Link to post Share on other sites
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.