Is there a specified tightening torque for the spark plug

Q15 Is there a specified tightening torque for the spark plug
A The tightening torque for a spark plug changes with the diameter of the spark plug.
The following are the recommended torque values.

When installing the spark plug, first screw it in by hand. Once the gasket has made contact with the cylinder head, use the torque wrench to tighten it to the tightening torque shown below.

A rubber pipe as shown in the figure to the right is a good substitute for hand
tightening/removing spark plugs.

Conical seat type For (spark plugs without gaskets)

The tightening angle for both new and reused spark plugs is 1/16th of a turn.

Examples of common installation problems and advice to avoid them.