they are on the valve cover there should be a cover for the sparkplugs anyways soo you need a star wrench to get the 4 of them out then afta you take that cover off you will see the wires connection going to them you unplug them and then you need a phillis head screw driver or a 10mm socket to take out the srews there are one on each side of each plug then afta pull out the plugs on the back there is no cover soo get a flashlight and look for those 2 screw that are holding the plugs on the valve cover
With a Spark plug gap tool :)
Your ac port or generator.
0.060in
By taking the spark plug wire off, and then using a spark plug socket with a ratchet and extension. It's not rocket science.
45
.060
.050
with a spark plug #5224 the gap setting is .040
video donde esta enl tornillo de drain plug en nisssan maxima 97
0.51
The Spark Plug Gap.054 (In thousandths of an inch)
If you mean on the exterior of the spark plug then the valve cover gasket is leaking. If it is on the electrode of the plug you are burning oil.