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Old 03-23-2013, 03:22 PM   #1
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Changing plugs

How many torque specs do u use when putting in new plugs on a 2001 gt? Just wanna make sure they don't over torqued..
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Old 03-23-2013, 03:26 PM   #2
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snug them down and barely past that
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Old 03-23-2013, 03:28 PM   #3
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We are thinking 13. Trying to look it up
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Old 03-23-2013, 03:30 PM   #4
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Spark plugs don't really need a specific torque, just make them snug then just a little past.
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Old 03-23-2013, 04:24 PM   #5
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Spark plugs don't really need a specific torque, just make them snug then just a little past.
That's what I do. Finger tight then toque it 1/4 more.
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Old 03-24-2013, 04:30 PM   #6
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Anyone know of a detailed write-up or how-to on changing these plugs?
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Old 03-24-2013, 04:36 PM   #7
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long extension and wobble socket
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Old 03-24-2013, 05:22 PM   #8
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long extension and wobble socket
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Old 03-25-2013, 04:21 PM   #9
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That's what I do. Finger tight then toque it 1/4 more.
NO...

The shop manual spec is 11 lb-ft. Finger tight then 1/16th turn will be about 13-15 lb-ft, most plug maker's recommendation for taper seat plugs. Adding 1/4 turn will bring them up to 45 lb-ft or better--way too tight...

Here is a test I did using a "plug bore" machined into a block of aluminum alloy:



You can see that adding 1/6th turn (22.5°) required 15 lb-ft, 1/4 turn (90°) more took 47 lb-ft!

It is vital to properly torque the plugs on the 4.6L 2V, not doing so is what leads to the plug blowouts we hear about far too often.

I personally feel 11 lb-ft is too low for used heads with oily/carboned-up threads--and with the common use of never-seize (not recommended by Ford, the minimal threading was engineered to deal with seizing issues). These both lubricate the threads and make the plug easier to "back-out" under normal operation.

This is why I use and recommend 13 to 15 lb-ft, generally setting my wrench for 170 lb-in (14.2 lb-ft); though for a year or more now I have been using a torque-limiting socket:



This neat tool is calibrated to very accurately provide 20 N·m (177 lb-in, 14.75 lb-ft) of torque, no more and no less. Read more about it here.
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