Quote:
Originally Posted by jay_bob
Get the engine warmed up. Ok to run without the manifold to get it warm, use common sense and don't let anything get sucked in.
Try AeroKroil penetrant, nothing else compares.
I would get it warm, pull the manifold, and apply the penetrant in the evening (like Friday night). Then Saturday morning start it up again and let it get heated up. Then hit the plugs again with the AeroKroil.
Wait a few minutes then use a battery operated impact to free the plugs. I have read many threads on this and this seems to be the best tactic. Don't use a gorilla 3/4 inch air compressor impact, just a little 1/4 inch battery drill type with a socket adapter. The impact has several benefits. One is that the many small shocks are better at breaking the plug loose than the constant force provided when you turn the ratchet. Also applying force with a ratchet tends to be off center due to the physics involved, this ends up applying an uneven force to the plug and I suspect this is what really ends up snapping them off.
Also don't forget to pick up a tube of Anti-Seize for the new plugs. And be sure you have either the official reamer tool or use an appropriately sized drill bit smeared with grease. Use No Power Tools on the reamer!!
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jay_bob, I wanted to simulate removing a seized glow plug before attempting it on my car. I took a piece of aluminum, drilled a hole a little larger in diameter than the small end of the glow plug (the tip that glows) then drilled down with the tap drill staying above the bottom of the block for the glow plug to seat at the bottom and finally taped the top and removed all cutting oil.
Using an oxy acetylene torch adjusted with a yellow flame, I covered the glow plug with soot, then screwed it into the block as tight as possible without risk of breaking it (I do not have a torque wrench yet) then applied Aerokroil and let soak for three days. I put the block in a vise and hit it with a small 3/8" air operated "butterfly" impact wrench (80 ft/lbs. max.) turned way down. I turned the wrench up half way, I'm guessing 40ft/lbs. and the glow plug would not budge. I tried this several times letting the impact wrench hammer for at least ten seconds at a time. the next thing I did was to heat the block up with the torch getting it just hot enough where I could hold it in my hand without getting burned. I hit it with the impact wrench and the plug spun right out!
Your idea of keeping the engine warm is excellent advice.
I might try this test again with the block cold and turning up the impact wrench a little at a time just to find the breaking point of the glow plug then turn it back down somewhat when I attempt this on my car with the engine warm.