Jeep Workshop Manuals
Grand Cherokee 2WD V6-3.7L (2008)
Engine, Cooling and Exhaust > Engine > Tune-up and Engine Performance Checks > Spark Plug > Component Information > Service and Repair > Spark Plug - Removal > Page 2751
Spark Plug: Service and Repair
INSTALLATION - EXCEPT 4.7L V-8
CAUTION: Never use a motorized wire wheel brush to clean spark plugs. Metallic deposits will remain on spark plug insulator and will cause
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 ignition coil rubber
boots. Also apply this grease to the tops of spark plugs.
2. Check and adjust spark plug gap with a gap gauging tool (1). Refer to the Spark Plug Specification section for plug gap.
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. Certain engines use torque sensitive spark plugs. It is a good practice to always tighten spark plugs to
4. Install ignition coil(s). Refer to Ignition Coil Installation for procedures.
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