[W126 Coupe] Fouled Spark Plug

[Henry Viveiros]

My 1991 560 SEC had been running rough and the dealership diagnosed the
problem as a #4 fouled plug that may be caused by a valve seal. They cleaned
the plug and things seem to be OK. Is the #4 plug on the right or left side?

My question is: can I remove the spark plug and clean it every once in a
while-I'm really not into taking the engine apart to replace the valve
seals.

When I look at the spark plugs I can just see the tip of the top and not the
part that the socket would fit on. Can I just slip a socket onto the plug to
determine the correct size to use? I haven't been able to "feel" if I am
actually on the plug or not. Am I likely to cause any problems (breaking the
plug)? I don't want to cause any more problems than I already have.

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