NGK CR8HS 7423 Spark Plug

In Modern Engines, Cylinder Heads Are Usually Made Of Aluminium, And With Heat This Material Expands More Than Spark Plugs, So Its Thread Seizes . Therefore, When Changing The Spark Plugs, The Engine Must Be Completely Cold . Features: - Loosen The Spark Plug That Is Mounted. - Before Removing It, Remove Deposits And Dirt From The Mounting Hole With The Help Of A Brush Or, If You Have The Means, By Applying Pressurized Air. - Unscrew The Old Spark Plug. - Remove Coarse Dirt From The Spark Plug Hole Area. - Hand Thread The Spark Plug Until It Stops. - Never Use Spark Plugs That Have Been Dropped On A Hard Surface Without Being Packaged. - Correctly Position The Indicated Wrench On The Spark Plug Nut And Tighten Moderately