5/8 inch spark plug socket.
They don't have spark plugs, therefore, no need for a wrench
To replace spark plugs, you can use a socket wrench, but a socket made for removing and replacing spark plugs is needed. This socket is relatively inexpensive and can be found at most auto parts stores.
Plugs are in the top of engine I think that's obvious well anyway pull and twist a little on the boots carefully by the boot not the wire, you will need I believe a 7/8 spark plug wrench. if you don't have a spark plug wrench(with rubber boot built inside the socket) you will have a problem getting the spark plugs out,that is once they are unthreaded.
Great link that someone posted on everything you need to know on changing your spark plugs! http://jeep.us41.org/sparkplugs/index.html
use the spark plug wrench and use used mirror to find the rear spark plug, you need to two person to do this, then fell the spark plug rear with your hands then apply the spark wrench to remove the old spark plug.
they are located in the engine block. You'll need an extension to the wrench in order to get them out.
to change the spark plugs first take off the plastic cover on top of the motor, the spark plugs are on the center of motor you see two coils on top of the two center spark plugs and two spark plugs wires going to the out side spark plugs you pull the wires off and you need a long socket wrench or a spark plug socket with extension bar to take it off, also you need to pull the coils to replace the center spark plugs they are under the coils. NOTE. this is for a four cylinder engine. excuse my English B. Cerda.
6 if you have a 6 cylinder. 8 if you have an 8 cylinder. OEM, NGK V-Power Spark Plugs are a good choice.
You will need a general screwdriver, a spark plug socket, a socket wrench and and extender, a wire brush and a silicone dielectric compound. You should find more of these tools at SEARS or your favorite car parts dealer. You will need a spark plug wrench with an extension to replace the spark plugs in a 1998 Nissan Sentra. You can find an instructional video at www.youtube.com.
The spark plug gap for a 1984 258 6 cylinder Jeep should be set at .033 inches. New spark plugs will be preset and should not need adjustments.
Wow, You have a 4.0l right which is an Inline 6. That would be 6 spark plugs. What ever you plan to do STOP, call your local mechanic, PLEASE!!
to change the spark plugs first take off the plastic cover on top of the motor, the spark plugs are on the center of motor you see two coils on top of the two center spark plugs and two spark plugs wires going to the out side spark plugs you pull the wires off and you need a long socket wrench or a spark plug socket with extension bar to take it off, also you need to pull the coils to replace the center spark plugs they are under the coils. NOTE. this is for a four cylinder engine. excuse my English B. Cerda.