New method to extract porcelain from broken spark plugs
#1
New method to extract porcelain from broken spark plugs
Changed my plugs this week, three broke and two left the porcelain in the head. To get them out I used a method that I haven't seen described anywhere that worked really well.
I used a #2-56 screw glued into a 2" #4-40 standoff as the "pin" to glue into the porcelain. For the "extractor," I drilled and tapped a #4-40 hole in the end of a 3/8" threaded rod and put a #4-40 screw in it. Essentially it was a threaded rod with a smaller threaded rod sticking out of one end. The extractor then screws into the end of the standoff part of the "pin." You use the same method to extract the porcelain as you would the ground shield with a threaded rod (described in this thread). The pins are sacrificial, but the extractor can be used over and over. It worked like a champ. Also, you can use the other end of the rod to extract the ground shield.
And if there's any interest, I could build more and sell them for a small fee.
Here are two of the "pins." The top one has porcelain attached. The bottom is unused.
Here is the "extractor." The right side is the tip, with #4-40 screw.
Here's an up close picture of the extractor tip.
Finally, here's an unused pin threaded to the extractor.
I used a #2-56 screw glued into a 2" #4-40 standoff as the "pin" to glue into the porcelain. For the "extractor," I drilled and tapped a #4-40 hole in the end of a 3/8" threaded rod and put a #4-40 screw in it. Essentially it was a threaded rod with a smaller threaded rod sticking out of one end. The extractor then screws into the end of the standoff part of the "pin." You use the same method to extract the porcelain as you would the ground shield with a threaded rod (described in this thread). The pins are sacrificial, but the extractor can be used over and over. It worked like a champ. Also, you can use the other end of the rod to extract the ground shield.
And if there's any interest, I could build more and sell them for a small fee.
Here are two of the "pins." The top one has porcelain attached. The bottom is unused.
Here is the "extractor." The right side is the tip, with #4-40 screw.
Here's an up close picture of the extractor tip.
Finally, here's an unused pin threaded to the extractor.
Last edited by vtron; 11-10-2008 at 05:57 PM.
#2
#4
It was really easy once the glue set up. I made the mistake the first time of not letting the Motorcraft carb cleaner dry before gluing the pin. The glue never set and it pulled right out of the porcelain. Once the cleaner dried and the glue cured, a few turns of the nut and the porcelain pulled right out. Hardest part was putting the pin in the hole and trying not to touch the sides.
I'll post picks tonight when I get home.
By the way, I used Locktite 444.
I'll post picks tonight when I get home.
By the way, I used Locktite 444.
#7
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#8
Changed my plugs this week, three broke and two left the porcelain in the head. To get them out I used a method that I haven't seen described anywhere that worked really well.
I used a #2-56 screw glued into a 2" #4-40 standoff as the "pin" to glue into the porcelain. For the "extractor," I drilled and tapped a #4-40 hole in the end of a 3/8" threaded rod and put a #4-40 screw in it. Essentially it was a threaded rod with a smaller threaded rod sticking out of one end. The extractor then screws into the end of the standoff part of the "pin." You use the same method to extract the porcelain as you would the ground shield with a threaded rod (described in this thread). The pins are sacrificial, but the extractor can be used over and over. It worked like a champ. Also, you can use the other end of the rod to extract the ground shield.
And if there's any interest, I could build more and sell them for a small fee.
Here are two of the "pins." The top one has porcelain attached. The bottom is unused.
Here is the "extractor." The right side is the tip, with #4-40 screw.
Here's an up close picture of the extractor tip.
Finally, here's an unused pin threaded to the extractor.
I used a #2-56 screw glued into a 2" #4-40 standoff as the "pin" to glue into the porcelain. For the "extractor," I drilled and tapped a #4-40 hole in the end of a 3/8" threaded rod and put a #4-40 screw in it. Essentially it was a threaded rod with a smaller threaded rod sticking out of one end. The extractor then screws into the end of the standoff part of the "pin." You use the same method to extract the porcelain as you would the ground shield with a threaded rod (described in this thread). The pins are sacrificial, but the extractor can be used over and over. It worked like a champ. Also, you can use the other end of the rod to extract the ground shield.
And if there's any interest, I could build more and sell them for a small fee.
Here are two of the "pins." The top one has porcelain attached. The bottom is unused.
Here is the "extractor." The right side is the tip, with #4-40 screw.
Here's an up close picture of the extractor tip.
Finally, here's an unused pin threaded to the extractor.
#13
#14
Iam happy you got them out on your own Its sad that you had to go through all of that just to change plugs Ford knows that there is an issue with the plugs But they dont care