Spark Plug - Installation

5.7L / 6.4L






CAUTION: Handle the spark plugs with care. Do not drop or force the spark plugs into the wells, damage to the electrodes and/or porcelain body may occur. Always start each spark plug by hand in order to avoid cross-threading the spark plug in the cylinder head.Always tighten spark plugs to the specified torque. Too much or not enough torque will cause damage to the cylinder head and/or spark plug and may lead to poor engine performance.

1. To avoid cross threading, start the spark plug(s) into the cylinder head by hand.
2. Tighten the spark plugs as follows:
- 5.7L - 25 - 30 Nm (18.5 - 22 ft. lbs.)
- 6.4L - 10 - 20 Nm (7.5 - 15 ft. lbs.)

3. Apply dielectric grease to the inside of spark plug boots (1).
4. Position the ignition coil into the cylinder head and push both spark plug boots onto each spark plug.





5. Install the ignition coil retaining bolts (3) and tighten to 12 Nm (9 ft. lbs.).
6. Connect the ignition coil electrical connector (1).
7. Connect negative battery cable and tighten nut to 5 Nm (45 in. lbs.).