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: 150,000 (150,000–150,000)
Engines affected: 5.4L V8, V8
8 people reported this problem
1 person shared problem details
2002 Ford F-350 Super Duty- 5.4L V8150,000Visitor
blew out the spark plug so I tapped it again and used a helicoil
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