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Tool Talk Discussion Forum

frozen spark plugs

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robert1

01-23-2005 08:33:39




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Does anybody know any tricks for removing spark plugs from a cast iron head that are frozen really tight? Would an impact wrench work or rip out the threads? This is on a Chevy V-6 engine. Thanks.




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dr.sportster

01-24-2005 14:28:03




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 Re: frozen spark plugs in reply to robert1, 01-23-2005 08:33:39  
If the head is off [which I think it might not be]grind the swollen rust off from the combustion chamber side of the last thread or so that sticks into the combustion chamber.And disregard what I said about the Oxy/acet rig if you dont have one.Use the hand torch and patience to get it hot.



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Mike M

01-24-2005 09:31:24




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 Re: frozen spark plugs in reply to robert1, 01-23-2005 08:33:39  
If you get them out ,put some neverseez on the threads of the new ones.



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NEsota

01-23-2005 13:13:58




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 Re: frozen spark plugs in reply to robert1, 01-23-2005 08:33:39  
If after heating the plug shell you cool it with compressed air you can get back to work on it sooner and might gain due to contraction of the shell.



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dr.sportster

01-23-2005 12:18:33




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 Re: frozen spark plugs in reply to robert1, 01-23-2005 08:33:39  
As Bob said plan on breaking the porcelens right off.You need more like OXy/acet heat than small torch heat.They might shatter anyway cause the heat should be dull red.



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dr.sportster

01-23-2005 12:24:02




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 Re: frozen spark plugs in reply to dr.sportster, 01-23-2005 12:18:33  
Thats what Bob just said.Do what Bob said.



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dr.sportster

01-23-2005 10:55:59




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 Re: frozen spark plugs in reply to robert1, 01-23-2005 08:33:39  
In the archives there was a guy who had a method where he let the impact gun slowly tap on the lowest setting for hours if needed.Seemedlike a good idea.Otherwise heat em,tap em,heat ,tap,lots of Kroil[silikroil from eastwood]Let it cool try slight pressure.Never lose your cool.Take little breaks and come back to it.The heat and the soaking in are going to do it eventually.You must prevent yourself from applying too much force too soon .Thats the key.

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Bob M

01-23-2005 09:20:06




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 Re: frozen spark plugs in reply to robert1, 01-23-2005 08:33:39  
A couple non-impact solutions that have worked for me:

1 - First break the ceramic insulator off the plug. Then take a heavy heavy drift, stub of bar stock or similar and place it on the plug shell left in the head. Give the drift several sharp licks with a hammer before wrenching on the shell.

2 - Use a torch to heat the plug shell to a dull red. (Have a fire extingusher handy and be careful to not burn nearby wires, hoses, fuel lines, etc). Let the shell air cool for several minutes before attemtpting to unscrew the shell.

Trick is to break the plug's threads loose from the head without shearing the plug hex from the threaded shell, leaving just the threaded end of the plug in the head - a possibilty when using an impact wrench. (Been there, done that....!)

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randyb

01-23-2005 09:16:26




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 Re: frozen spark plugs in reply to robert1, 01-23-2005 08:33:39  
I sure would not use an impact wrench unless you want to replace the threads. I usually soak around the plug with penetrating oil and then run the engine to heat up the block as the plug and block are different metals. Try to remove hot with a breaker bar and good tight socket.



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Omar-KY

01-23-2005 17:37:46




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 Re: frozen spark plugs in reply to randyb, 01-23-2005 09:16:26  


I've had a couple plugs that the sholders striped. I welded a 2 in. long (porclin broke off)pipe that just fit over the plug on. After letting cool they came out easy. If the pipe isn't lon enough to get a wrench on weld a hex head bolt on top, then turn with a socket. The heat of welding nnd cooling did the work. Of course take all the precautions. Have fun.



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