OEM Mercury Mariner Spark Plug

Mercury Mariner Spark Plug Parts and Q&A

• Spark Plug
  AGSF-22F-1MX
  Q: How to service the spark plugs on Mercury Mariner?

  A:

  Service of spark plugs begins by removing two wire harness retainers from Ignition Coil stud bolts followed by disconnecting four ignition coil electrical connectors. A twisting motion of a slight degree should be applied to ignition coil-on-plugs before removal to create a better seal break for easier extraction. The service requires removal of 4 stud bolts and the ignition coils. Hand tools exclusively must be used throughout spark plug removal and installation procedures because this prevents cylinder head and spark plug destruction. Compressed air should be used to remove all foreign materials before beginning spark plug removal from the well. Following the removal of 4 spark plugs inspectors should check their condition and adjust each spark plug gap as needed. Hand tools only must be used for installing the 4 spark plugs before tightening them to 12 Nm (9 lb-ft). Before installing the ignition coil boots onto spark plugs, apply a tiny amount of dielectric grease inside them and follow by tightening stud bolts to 8 Nm (71 lb-in). Establish a connection between each ignition coil electric connector after you secure the two wire harness retainers onto the ignition coil stud bolts.
• Spark Plug
  AGSF-32Y-RAX
  Q: How should you inspect a spark plug for issues such as bridged gaps, deposit build-up, and signs of pre-ignition on Mercury Mariner?

  A:

  Check the spark plug to see if a bridged gap exists along with examining deposit buildup that can obstruct the electrode gap. Oil or carbon fouling may be the cause of this issue. Proper cleaning of the spark plug must be performed if needed. Anytime you find wet black deposits on the insulator shell bore electrodes you should investigate oil infiltration from worn rings and pistons and loosen valve-to-guide clearances and bearings to avoid such oil leak before installing new spark plugs. A thorough carbon inspection involves examining black dry fluffy carbon buildup on inspection tip surfaces of the insulator and exposed shell spaces and electrodes along with checking for a faulty heat range or dirty air filters or an abundant fuel mixture when idling. New spark plugs might be required for complete resolution. The correct burning appearance consists of light tan or gray residues along the spark plug firing tip. The presence of melted electrodes and damaged insulators with metallic deposits reveals engine damage that occurs from incorrect ignition timing or the wrong type of fuel or when an improper heli-coil insert replaces spark plug threads and requires replacement of the spark plug. Inspect for overheating signs that include white or light gray spots and bluish-burnt electrodes because of engine overheating, wrong fuel use, loose plugs or heat-range improper plugs and low fuel pressure or incorrect timing which require replacing the spark plugs with new ones. Examine fused deposits which look like bubbles or blisters from sudden acceleration since their presence requires replacement of the spark plugs.