10NM is 7.3ft/lbs. I doubt the bolt is weak enough that 2.7ft/lbs would shear the bolt off. Were you using a tire torque wrench, like one that reads up to 110ft/lbs? Is so, it probably is not that accurate for measuring just 10ft/lbs.
I don't even use a torque wrench for the spark plugs. Get them hand tight, and then give it 1/8th to 1/4 more turn. |