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Normally if the u-bolt assemblies are torqued the second and third time that is more than suffice (similar to wheels nuts). They should not become lose as all the u-bolts have had time to settle in and "find home" within the first few hundred miles of bumps, twists, and vibration. If you find that you have retorque a number of times and the nut needs another 1/4 or 1/2 turn; my concern would be that you have reached or passed the yield point of the bolt and simply stretched it to a point that it will actually snap. Tensile strength on a grade 5 bolt should be around 120,000 lbs per square inch (I think from memory). Remember those bolts are only a 1/2 inch diameter and a lot less at the root of the threads. On retorquing; if you find that the wrench clicks with no movement of the nut, the u-bolt assembly likely become stationary for the life of the system. This is then preventative maintenance. Ensure you have a good reliable torque wrench and use the same one each time with the rechecks. Ellis
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Threaded Mode
