08-10-2018, 11:13 AM
Anybody every have this happen to them?
I sheared the threads off a bolt on my CR250 shock linkage with my Sears torque wrench. After some research, I determined my manual was wrong because my friend had a different manual with a lower value. My wrench was inspected by our quality department where I work and it was within acceptable aerospace tolerance limits.
I just discovered that many automotive head bolt torque values are being given in degrees of rotation, and not final torque. My VW head bolt tightening sequence was: Initially torque value (which was low), followed by 1/4 turn, followed by another 1/4 turn, then starting the engine and warming it to operating temperature and tightening it another 1/4 turn.
I sheared the threads off a bolt on my CR250 shock linkage with my Sears torque wrench. After some research, I determined my manual was wrong because my friend had a different manual with a lower value. My wrench was inspected by our quality department where I work and it was within acceptable aerospace tolerance limits.
I just discovered that many automotive head bolt torque values are being given in degrees of rotation, and not final torque. My VW head bolt tightening sequence was: Initially torque value (which was low), followed by 1/4 turn, followed by another 1/4 turn, then starting the engine and warming it to operating temperature and tightening it another 1/4 turn.