300 I6 Sparkplugs
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300 I6 Sparkplugs
I just bought a 92 F150 with a 300 I6, it has been missing so im changing the spark plugs and the wires while im at it, the old sparkplugs are so rusted i cant unscrew them, ive already tried WD40 and PB Blaster, sitting over night, ive even broken a ratchet on one, given it was a cheap tool, but still. any suggestions?
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Well all I can say is use more penetrating oil, Break Free has worked pretty well for me in the past, its a little heavier than WD-40 and can penetrate better given time.
May be every evening put on more oil (more often wouldn't hurt), until the plugs will break loose.
May be when you put the new ones on you could used just a touch of anti-seize lubricant.
May be every evening put on more oil (more often wouldn't hurt), until the plugs will break loose.
May be when you put the new ones on you could used just a touch of anti-seize lubricant.
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As mentioned before, soak the crap outta the plugs with a penetrating oil (I only use PB blaster) and repeat the process until they finally break free. (Cheater-bar on a breaker-bar may be your best friend). Been there done that.. Be extremely careful not to break a plug, and use your head. If you get it to break free, even slightly, use the back and forth method. Loosen it a little, tighten it a little, loosen it a little, tighten it a little... etc, etc, etc.. You will eventually get them.
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Ditch the WD-40, it's not a penetrating oil. The best penetrating lubricant is Kroil. PB Blaster is good too. Just keep spraying it on every hour or so for several hours then use the breaker bar like others have recommended.
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Omg!!! That engine ran so long the spark plugs rusted in it???? Ive worked on some crappy stuff before, either it was abused to know end or it was just ran that long either way kudos to the i-6!!!!! I know i falling head over heels with my newly aquired 89 bronco with the i-6!!!!
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Junior User
Joined: Jun 2010
Posts: 52
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Omg!!! That engine ran so long the spark plugs rusted in it???? Ive worked on some crappy stuff before, either it was abused to know end or it was just ran that long either way kudos to the i-6!!!!! I know i falling head over heels with my newly aquired 89 bronco with the i-6!!!!
Post Fiend
Joined: Oct 2009
Posts: 8,674
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From: town of less than 200 ppl
Omg!!! That engine ran so long the spark plugs rusted in it???? Ive worked on some crappy stuff before, either it was abused to know end or it was just ran that long either way kudos to the i-6!!!!! I know i falling head over heels with my newly aquired 89 bronco with the i-6!!!!
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