Spark Plug: Service and Repair

Removal
1. Remove air cleaner inlet tube assembly.

Spark Plug Wire Remover:

2. Remove distributor to spark plug wire from spark plug using Spark Plug Wire Remover T74P-6666-A, or equivalent.
3. Remove any dirt or foreign material from spark plug areas of cylinder head with compressed air. Remove spark plugs from cylinder block using appropriate socket, extension and socket wrench.






Installation
1. Refer to the Spark Plug Inspection Chart to determine spark plug condition. Replace spark plugs as required.

Gapping Spark Plug:

2. Check and set the spark plug electrode gap to: 1.07-1.17 mm (0.042-0.046 inch) using an appropriate gapping tool.
3. Install spark plugs into cylinder block. For V-8 engines, tighten to 9-20 Nm (7-15 lb ft).
4. Coat entire interior surface of ignition wire boot with Silicone Dielectric Compound (WA-10) D7AZ-19A331-A or equivalent meeting Ford specification ESE-M1C171-A. Install onto proper spark plug. Make sure spark plug wire boot is completely seated.
5. Install air cleaner outlet tube and inside engine cover, if required.
6. Start engine and check for proper operation.