Spark plug Torque specs
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Laughing Gas
Joined: Jan 2019
Posts: 868
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From: Florida
Spark plug Torque specs
Hello, I have the 2002 F-250 5.4L 2V V-8 and need to know the torque specs for the spark plugs. I have seen a huge range upto 27 FT LBS. Low range was 14 FT LBS> So, which is it without stripping the aluminum heads? Have 240,000 miles on original heads..
Tuned
Joined: Dec 2017
Posts: 293
Likes: 29
From: Houston
In my experience stripping is not the root issue. The plugs working their way loose due to vibration and thermal cycling is. Once they unscrew they launch. I torque to 18 and as part of the annual PM I re-torque to the same.
Moderator
Joined: Jul 2010
Posts: 12,049
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From: Media PA
My ‘05 2valve V-10 has its plugs torqued to 28 ft/lbs.
There is a video of a guy in a junkyard testing the older short thread modular heads and at around 100 ft/lbs the plugs started to snap off but the the crappy threads in the heads held up fine. Personally I would take the short thread older heads up to 26/28 ft/lbs without any fear, many owners here have and have experienced far less blowout issues.
There is a video of a guy in a junkyard testing the older short thread modular heads and at around 100 ft/lbs the plugs started to snap off but the the crappy threads in the heads held up fine. Personally I would take the short thread older heads up to 26/28 ft/lbs without any fear, many owners here have and have experienced far less blowout issues.
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Laughing Gas
Joined: Jan 2019
Posts: 868
Likes: 84
From: Florida
Thanks Jetty. I had a plug blow on me 2 years ago. Unbeknownst to me, a shop put in one of those "auto parts stores" fixes. Anyway, bought a Cal-Van kit and that install went smooth. I always (when it comes to plugs) split the difference between a high and a low published Torque number.
PJ
PJ
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