Join Date: Apr 2000
Location: Danville, CA USA
If that bolt was only tightened to 10lbs-ft of torque, then there would be very little pressure between the crush sleeve inside the bolt and the front of the TA.
When the engine applies torque to the rear axle, the nose of the TA tries to lift up. This is going to push the bottom surface of the crush sleeve against the face on the nose of the TA harder and pull the top of the crush sleeve away from the face of the nose on the front of the TA. When the bolt is torqued to only 10lbs-ft, it will only take a very small amount of engine torque to pull the crush sleeve off of the nose of the TA face at the top. As soon as this level of torque is reached, the bolt is now being bent by the torque at the rear axle. The bolt is going to fail very quickly.
The purpose of the fastener torque is to always keep the joint loaded in compression, even when tension and prying loads are counteracting the compression force.
If all of the compression load is counteracted by tension or prying loads, then the bolt will also come loose very easily.
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