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Originally Posted by kip Foss
Before I start twisting on them I soak them in penetrating oil and start tapping them with a hammer. By tapping I mean hitting them hard enough so that the hammer bounces off but not hard enough to peen them over.
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The issue is not with the threads. It is the fact that carbon gets packed around the shaft of the plug and refuses to let it turn.
I agree with the approach to providing impact. However, tapping with a hammer might take 24 hours to get a result in this case.
I would like to see someone get an impact wrench, calibrate it at reduced air pressure so that it cannot put out more than
40 ft.-lbs. torque.
Set the wrench up on the glow plug and let it hammer away for an hour if necessary. The vibration created in the plug will, hopefully, break loose the carbon that is gripping the plug and allow it to slowly rotate.
If you keep the torque down below 40 ft.-lbs., it will not be possible for you to get agressive with a standard wrench and break the plug. Just set the impact wrench on the plug and let it hammer away for awhile.