Got the Explorer back from the guys attempting to repair it.
They were able to clean up the threads (had to move a bunch of stuff out of the way) and get the plug to seat correctly and tight. If they could not clean up the threads they would NOT have attempted to pull the head. They said that they would not do it. Too much of a pain... That motor has a timing chain on the front and back of the cylinder head and it is a hassle. Glad I did not try this....
They also checked the other plugs and found they were not seated properly (no damage) and installed the two plugs that my son could not get to...
The only issue with the fixed plug is that on this engine, the designed does not use a compression washer on the plug to help seal the plug. The plug and head uses a bevel cut (metal on metal) to achieve this.
So when my son put the plug in, he damaged the bevel. So now when the engine is running, you can hear a slight noise from the cylinder as some of the pressure escapes.
The truck drives fine so there should not be an issue (except for the reduced cylinder pressure on No. 1).
My son now says that he is going to save up the money and have a proper repair done this summer.... That will be about $1500....
The repair only cost me $160.00
Another life lesson at Dad's expense....
