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Its a 13mm spanner that you require.
what size spanner
its 8mm square
it is a 5 minute job and no you dont have to strip the engine down . Just follow the four spark plug leads to the plug do one at a time so you dont mix the leads up remove lead by pulling it off the plug remove plug with proper size sparkplug spanner or socket put new plug in but check the gap is correct usally you can get this from any shop that sells the plugs some are preset tighten to reasonable tightness put lead on and do the same with the rest. hope this helps ..
Spark plug setting should be at .31
what is the spark plug gap size for a 1987 suzuki savage 650?
18 mm spark plug socket
the spark plug gap size on a Mercedes e420 is .32
.035 gap. DPR8ea-9 spark plug
if your engine is a 2.4l twin cam you need to remove the top covers. then underneath there are individual coil packs secured by 10mm spanner bolts. remove them and pull the coil out. the spark plugs are there and need a slim size plug socket....
You need an 18 mm spark plug socket.
on a corsa life , 53 plate , its a T40 torque drive.