Do not let the spark plug fall into its well. Damage to the insulator can result. If the spark plug falls into the well, replace it with a new spark plug.
Use a 13/16 inch magnetic socket to remove the spark plug for standard ignition systems.
When using solvents, acids, or alkaline materials for cleaning, follow the manufacturer’s recommendations for use. Wear goggles and protective clothing to reduce the possibility of personal injury.
Spark plugs must always be kept clean. Never touch the porcelain of the spark plug. If the porcelain becomes dirty, it must be cleaned before installation. Cleaning can be done with 100 percent isopropyl alcohol with no additives and a clean cloth.
NOTE: An equivalent spark plug socket can be substituted if necessary.
The spark plug socket used for installation must also be kept clean. Do not use a spark plug socket with a rubber insert. Rubber inserts can contaminate the spark plugs that you have just cleaned. Use a 13/16-inch magnetic socket to install the spark plug.
Check the diameter of the threads prior to installing the spark plugs.
Spark plugs must always be tightened to the correct torque value. On a hot engine, tighten all of the spark plugs hand tight before tightening the first spark plug with a torque wrench. This will allow all of the spark plugs to warm up to the cylinder head temperature prior to tightening.
Never use Cummins Lubriplate™ in or on a spark plug adapter boot. Lubriplate™ is a conductor and its use can lead to spark plug flashover, resulting in engine damage.
Cummins Inc. recommends the following dielectric grease:
Dupont Krytox 205, Dupont Krytox 206, or Poli-Si-PST-508, Cummins Part Number 3164956.
Apply a pea-sized amount of dielectric lubricant to the spark plug wire o-ring prior to installation. The approved dielectric grease is Cummins Part Number 3164956 or Dupont Krytox 205. This adds to the dielectric seal of the rubber boot and reduces the possibility of the boot melting onto the spark plug.
Hello, I'm Jack, a diesel engine fan and a blogger. I write about how to fix and improve diesel engines, from cars to trucks to generators. I also review the newest models and innovations in the diesel market. If you are interested in learning more about diesel engines, check out my blog and leave your feedback.
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