SilverNology Silver spark plugs
Torque Specifications
- Before installing any spark plug, always apply antiseize to threads. This assures easy removal of the spark plug and prevents corrosion and seizing.
- 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.
- 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 |
