Why I stopped chasing the factory torque specs on every single bolt

I work on old Cessnas mostly, and everyone told me you gotta follow the manual to the letter. But after stripping a third control cable bracket on a 172 last spring, I tried something different. I started using a beam-style torque wrench set to the low end of the spec, not my fancy clicker that's always off by 5 ft-lbs. Has anyone else found that the factory numbers are just not right for 30-year-old hardware?

3 comments

3 Comments

rowangonzalez2d ago

My buddy Joe rebuilt a 1970 Ford F100 back in 2017 and he was dead set on using the factory torque spec for the intake manifold bolts. Snapped two of them clean off before he realized the block was warped by like three thousandths. He just gave up, drilled and helicoiled the holes, and snugged them by feel. Truck still runs fine today. I think those old manuals were written when everything was fresh off the assembly line, not after decades of heat cycles and corrosion.

grant1302d agoTop Commenter

That actually reminds me of a buddy who restored a 68 Camaro and spent three weekends trying to get the timing chain right because he was following the manual to the letter. Turns out the chain was stretched from age and the factory marks didn't line up anymore. He ended up just lining the dots by eye and the thing purrs like a kitten. These old cars develop their own personalities over time I swear.

nancy_green2d ago

Snugged them by feel" is the gospel truth for old trucks.