Nology Silver spark plugs


Torque Specifications

  1. Before installing any spark plug, always apply antiseize to threads. This assures easy removal of the spark plug and prevents corrosion and seizing.
  2. For best high voltage insulation, to prevent arcing-over on the outside of the aluminum oxide insulator and to repel moisture, always apply a high quality silicone grease to the inside of the spark plug boot.
  3. To gap spark plugs always use a spark plug gapping tool. Never pry the ground electrode with a screwdriver or similar object. This could permanently damage the ceramic insulator and the center electrode, making the spark plug inoperable and voiding the warranty.

Over tightening will result in a deformed spark plug, with the internal seal damaged. A spark plug damaged this way can lead to premature spark plug failure and even engine damage. Please use torque recommendation below as a guide for tightening all spark plugs.

  CAST IRON HEADS ALUMINUM HEADS
SPARK PLUG THREAD SIZE WITH TORQUE WRENCH WITHOUT TORQUE WRENCH WITH TORQUE WRENCH WITHOUT TORQUE WRENCH
GASKET TYPE
10mm 8-12 lb. ft. 1/4 Turn 8-12 lb. ft. 1/4 Turn
12mm 10-18 lb. ft. 1/4 Turn 10-18 lb. ft. 1/4 Turn
14mm 26-30 lb. ft. 1/2 to 5/8 Turn 18-22 lb. ft. 3/8 to 1/2 Turn
18mm 32-38 lb. ft. 1/2 to 5/8 Turn 28-34 lb. ft. 3/8 to 1/2 Turn
TAPERED SEAT
14mm 7-15 lb. ft. 1/16 Turn 7-15 lb. ft. 1/16 Turn
18mm 15-20 lb. ft. 1/16 Turn 15-20 lb. ft. 1/16 Turn

Nology torque settings