There is a technical service bulletin for the V8 engines regarding a possible problem with the spark plug being ejected from the cylinder head, damaging the threads in the spark plug hole. If the vehicle is under warranty, cylinder head replacement is recommended. If the vehicle is out of warranty, Ford authorized the use of a specific thread insert to repair the head.
One or More Spark Plugs May be Ejectioned From the Cylinder Head on Ford F-350 Super Duty
Average mileage: 200,000 (150,000–250,000)
Engines affected: 5.4L V8, 6.8L V10, V8
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I have two spark plugs eject #4 and #5 within a year. I have used been using timesert inserts and they have to be changed each time I tune up truck. This is a real pain and this "Flaw" by Ford has really caused me a lot of stress. Now I have a insert and new spark plug spinning and can't see the insert with spark plug in there to tell what is going on!!! I am trying to make my socket extension and ratchett stronger so I can turn and pull with force , no luck yet i am afraid that I will have to pull the head. Help
blew out the spark plug so I tapped it again and used a helicoil