Details

• Brand:

  

  

• SKU:

  F5LY-6C527-A

• Other Names:

  Gasket Spark Plug Aperture

• Description:

  This is the genuine Ford spark plug tube seal, the rubber gasket that seals the spark plug well in the valve cover so engine oil cannot collect in the spark plug tube around the plug and the ignition coil or wire boot. Cataloged by Ford as the spark plug tube seal, also listed as the spark plug aperture gasket, it is a widely shared service part used across many Ford, Lincoln, and Mercury engines over roughly two decades of production, spanning four-cylinder, V6, and modular V8 applications, which is why it is listed as a common seal rather than a single-model part. When this seal hardens, shrinks, or tears, oil migrates down into the spark plug tube and pools around the plug and coil boot; the classic symptoms are oil-soaked spark plug wells discovered during a tune-up, oil-fouled plugs, swollen or carbon-tracked coil-on-plug boots, ignition misfires, and a rough idle or hesitation as spark is compromised. Left unaddressed, the trapped oil degrades the coil boots and can lead to repeat misfire faults. Replacing the tube seals during a spark plug or coil service keeps the wells dry and protects the ignition components. This genuine Ford seal matches the original bore diameter, cross-section, and material so it seats cleanly in the valve cover tube and maintains its seal through repeated heat cycles. It is good practice to renew these seals whenever the valve cover is off or the plugs are serviced, since a dried-out seal is inexpensive insurance against oil-fouled ignition. Ordering by the Ford part number ensures the correct seal for the spark plug tube.

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