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My buddy swore by a specific torque for spark plugs on a Ford 5.4L
He told me to crank them to 28 ft-lbs, said it was the only way to prevent them from blowing out. I did it on a 2004 F-150 last month and it felt way too tight. Turns out the spec is actually 26 ft-lbs, and I ended up stripping the threads in the aluminum head. Had to do a time-sert repair that cost the customer an extra $300. Anyone have a go-to method for checking specs you actually trust?
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paul2512mo ago
Honestly, I just grab the factory service manual for that exact year and model. Tbh, even two pounds over on aluminum is asking for trouble.
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clark.robin1mo ago
So what do you do when the manual is wrong?
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