Spark Plug - Installation

INSTALLATION - 4.7L V-8





CAUTION: This engine uses TWO DIFFERENT types of spark plugs. A total of 16 plugs is used. The plugs are mounted in two rows (banks). The upper row (5) is used on the intake valve side of the cylinder head. The lower row (6) is used on the exhaust valve side of the cylinder head. The upper row (5) uses Bosch Nickel Yttrium plugs #05149050AB. The lower row (6) uses Bosch Iridium plugs #05149888AA. DO NOT INTERCHANGE THESE PLUGS.

CAUTION: Never use a motorized wire wheel brush to clean spark plugs. Metallic deposits will remain on spark plug insulator and will cause plug misfire.

CAUTION: Do not attempt to clean any of the spark plugs. Replace only.

1. To aid in coil installation, apply silicone based grease such as Mopar(R) Dielectric Grease # J8126688 into spark plug end of rubber boots (4) and (7). Also apply this grease to the tops of spark plugs (5) and (6).




2. Check and adjust spark plug gap with a gap gauging tool (1). Refer to the Spark Plug Specifications for plug gap. Two different gaps are used.
3. Start the spark plug into the cylinder head by hand to avoid cross threading. Special care should be taken when installing spark plugs into the cylinder head spark plug wells. Be sure the plugs do not drop into the plug wells as electrodes can be damaged.

CAUTION: Due to tight clearances between upper row of plugs (5) and cylinder head, a conventional deep, thick-wall spark plug socket will not fit. Use a deep, THIN-WALL 5/8" spark plug socket for plug removal and installation.

Always tighten spark plugs to the specified torque. Certain engines use torque sensitive spark plugs. It is a good practice to always tighten spark plugs to a specific torque. Over tightening can cause distortion resulting in a change in the spark plug gap, or a cracked porcelain insulator.

4. Install ignition coil(s).
5. Install necessary air filter tubing and air intake components to top of engine and to throttle body.