Just realized my torque wrench calibration was off for a whole year

I kept having issues with cylinder head bolts backing out on the same engine model, and everyone in the shop told me I was just not torquing them right. But I was following the manual step by step, using the same technique I've used for 15 years. After 6 months of this driving me crazy, I finally sent my Snap-on digital torque wrench in for calibration. Turns out it was reading 12% higher than actual torque the whole time. So I was torquing those bolts way past spec and stretching them out. It cost me a $45 calibration fee and about 3 weeks of lost time on customer engines. Has anyone else had a shop tool slowly drift out of spec without noticing?

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1 Comment

val_williams3h ago

Man, that sucks so bad. I feel your pain on this one, I've been there with a dial indicator that was reading a few thousandths off and it drove me bonkers trying to figure out why my bearing clearances kept coming out wrong. It's such a sneaky problem too because you trust your tools, especially the expensive digital ones, and they give you that false sense of security. A whole year of that is brutal, I bet you felt pretty frustrated every time you turned a wrench on those heads. It's a good reminder for all of us to just send stuff in for a checkup more often, even if it feels like a waste of time and money.