Johnny_P wrote: ↑Fri Mar 15, 2024 4:08 pm
Desertbreh wrote: ↑Fri Mar 15, 2024 3:33 pm
Literally? How did that transpire?
Ford mod motor, baby. It’s a thing.
More on Ford Spark Plug Blow Outs – What causes it?
Ford spark plugs blowing out is a common problem with engines in Ford F150 pick up trucks, Mustangs, Crown Victorias, Vans, Expeditions and motor homes. A video showing spark plug thread repair using the Calvan spark plug thread repair kit being used can be viewed on the Calvan 38900 description page. Read on for more information.
Ford 4.6, 5.4 and 6.8 modular engines are prone to spark plugs being blown out of the cylinders due to the aluminum threads failing. If the spark plugs are not tight enough the spark plug vibrates until the aluminum is weakened to a point the spark plug shoots out. Some blame faulty aluminum, but there are no other issues with any other part of the heads. Ford originally had a lower torque specification and later revised it making the torque spec higher and plugs tighter. When the threads are about to come loose there is often a slight ticking sound/noise, like a small “exhaust manifold leak” would sound. As stated before, the problem usually starts if the spark plug is loose. The coil keeps the plug from backing out completely. The spark plug vibrates until the aluminum threads in the cylinder head are deteriorated to a point that the spark plug ejects from the pressure of the compression from the cylinder. The spark plug ejecting typically breaks the coil on the way out.
Although rare, it’s possible an engine compartment fire can start due to the raw fuel escaping the engine cylinder and the broken coil can provide the spark. We have many Ford dealers that use Time Sert and Calvan, however there are some Ford dealers that will not recommend repairing the threads. Many only recommend replacing the cylinder head. Because of the cost of labor and parts involved in replacing the heads, we recommend using the appropriate thread repair kit made by Time Sert or Calvan. After the repair the threads will be stronger than original.