Commander 4WD V8-4.7L VIN N (2006)
Spark Plug: Service and Repair
Removal and Installation
Each individual spark plug is located under each ignition coil. Each individual ignition coil must be removed to gain access to each spark plug.
1. Remove necessary air filter tubing at throttle body.
2. Prior to removing ignition coil, spray compressed air around coil base at cylinder head.
3. Prior to removing spark plug, spray compressed air into cylinder head opening. This will help prevent foreign material from entering combustion
4. Remove spark plug from cylinder head using a quality socket with a rubber or foam insert. Also check condition of ignition coil O-ring and replace
5. Inspect spark plug condition.
NOTE: The 4.7L is equipped with copper core ground electrode spark plugs. They must be replaced with the same type/number spark plug as the
original. If another spark plug is substituted, pre-ignition will result.
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.
Always tighten spark plugs to the specified torque. Over tightening can cause distortion resulting in a change in the spark plug gap or a cracked porcelain
1. Start the spark plug into the cylinder head by hand to avoid cross threading.
2. Tighten spark plugs to 27 N.m (20 ft.lbs.). 3.7L & 4.7L.
3. The 5.7L is equipped with torque critical design spark plugs. Do not exceed 15 ft. lbs. torque. Tighten spark plugs to 18 N.m (13 ft.lbs).
NOTE: 5.7L does not use an o-ring
4. Before installing ignition coil(s), check condition of coil O-ring and replace as necessary. To aid in coil installation, apply silicone to coil O-ring.
5. Install ignition coil(s).