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Old timer told me to never trust a dry torque reading back in 2016
Had a 50 year vet at the shop in Tulsa tell me to always oil my threads before torquing head bolts. I figured he was just set in his old ways. Two years later I did a 6.0 Powerstroke job bone dry and snapped three bolts in the block. Spent 14 hours drilling and extracting them. That guy knew what he was talking about after all. Has anyone else had an old rule come back to bite them?
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pat_moore5d ago
Pat Moore" - dry torque ignores thread friction variables.
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the_rowan5d agoTop Commenter
Oh man, Pat nailed it. Dry torque specs are basically a crapshoot once you factor in thread condition. I had a job last year where the same torque setting on dry bolts was giving me wildly different clamp loads depending on if there was any oil or dirt on the threads. Reran everything with a drop of lube and the readings were actually repeatable. People forget that friction eats up so much of that applied torque, it's not even funny.
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shane_park925d ago
Whoa, that reminds me of a time I was torquing down some suspension bolts on my old truck and couldn't figure out why one side felt tighter than the other. You think you're being careful, but a little grease or dirt really throws everything off, huh?
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