Spark Plug: Service and Repair

REMOVAL





1. Use Spark Plug Wire Remover to pull the ignition wires off the spark plugs.

NOTE:
- Use compressed air to remove any debris from the spark plug well before removing the spark plugs.
- If an original spark plug is reused, make sure it is placed in the same cylinder it was taken from. Replacement spark plugs can be used in any cylinder.





2. Remove the RH spark plugs.





3. Remove the LH spark plugs.





4. Inspect the spark plugs for:
- Deposits bridging spark plug gap (A).
- Wet black deposits (oil fouling) (B).
- Dry black deposits (carbon fouling) (C).
- Overheating (D).
- Deposits fused on spark plug (E).
- Pre-ignition damage (F).
- Normal spark plug (G).

INSTALLATION

1. Apply Silicone Dielectric Compound D7AZ-19A331-A or equivalent meeting Ford specification ESE-M1C171A to the inside of the spark plug wire boots.

NOTE: If an original spark plug is reused, make sure it is placed in the same cylinder it was taken from. Replacement spark plugs can be used in any cylinder.





2. Adjust the spark plug gap as required.





3. Install the LH spark plugs.





4. Install the RH spark plugs.
5. Connect the spark plug wires.