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seized spark plugs
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cowkicker View Drop Down
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Joined: 21 Mar 2010
Location: Ky
Points: 522 		Post Options Post Options   Thanks (0) Thanks(0)   Quote cowkicker Quote  Post ReplyReply Direct Link To This Post Topic: seized spark plugs
    Posted: 12 Apr 2025 at 5:14pm
Looking for suggestions on removing spark plugs from a 1997 mountaineer 5.0 with cast iron heads. Tried to remove two of them and wasn't even able to turn them any, did crack the porcelain on one of them. Letting them soak with PB blaster now, all that I have at the moment. Suggestions???
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 21312 		Post Options Post Options   Thanks (1) Thanks(1)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 12 Apr 2025 at 5:48pm
Have the engine WARM. Always warm.
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
Location: illinois
Points: 85236 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 12 Apr 2025 at 6:04pm
heat and soak with oil is about the best you can do... If all else fails, i would try an impact.. 1000 small WACKS is better than a constant  PULL trying to get something loose.
Like them all, but love the "B"s.
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PaulB View Drop Down
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Joined: 12 Sep 2009
Location: Rocky Ridge Md
Points: 4915 		Post Options Post Options   Thanks (0) Thanks(0)   Quote PaulB Quote  Post ReplyReply Direct Link To This Post Posted: 13 Apr 2025 at 7:04am
If it has those taper seat spark plugs, they are very common to seize in the heads. Not one of FORDs better ideas (like most of FORDs wacked ideas). I give them a "bump" with an impact to loosen them. 
If it was fun to pull in LOW gear, I could have a John Deere.
Real pullers don't have speed limits.
If you can't make it GO... make it SHINY
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ekjdm14 View Drop Down
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Joined: 20 Aug 2024
Location: Manchester UK
Points: 696 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ekjdm14 Quote  Post ReplyReply Direct Link To This Post Posted: 13 Apr 2025 at 11:22am
Pretty much all been said above, heat is essential. If just having the engine hot doesn't help, heat each one smoking hot with a blowtorch & douse with PB or similar.

Impact if you can get in there, if you break the plug off after heat/soak with the impact then it was going to break anyway.
Stuck Farmer
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cowkicker View Drop Down
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Joined: 21 Mar 2010
Location: Ky
Points: 522 		Post Options Post Options   Thanks (1) Thanks(1)   Quote cowkicker Quote  Post ReplyReply Direct Link To This Post Posted: 13 Apr 2025 at 12:17pm
Soaked them, warmed engine up,  3/8 impact on lowest setting, after a bit of hammering, they turned loose. Thanks
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