P18. What precautions should be taken during spark plug installation?

It verifies in the manual of the vehicle and/or in the application table up to date NGK if the spark plug is the recommended one for the engine of its vehicle. With a bore it confers the recess enters the electrodes of the sparkling plugs. Not pass any type of lubricant in the thread of the spark plugs.

Torque the spark plug until the specified torque

   Excessive torque
• Causes metal castle rupture.
   Insuficient torque
• Causes over-heating.

Its essential to install the spark plug until the specified torque. First, it manually places the spark plug until the housing touches the breech and then torque it with the specified torque, as indicated in the illustrations below:

Examples of problems that can show-up during spark plugs installation

	Thread damage	Metallic castle damage	Isolator damage
Problems details
Cause	Spark plug insertion with angle	Excessive torque	The torque wranch was used with angle or slided.
Corrective measures	Torque first the spark plugs with your hands instead of using a wranch from the start.	Torque until the specified torque.	Use an hexagonal wranch that does not slide easily.