If you are talking about actually coming out of the block, it may be that you did not use the metal gasket that some use or you did not tighten it enough when installing.
I believe these are TSB's addressing this. Could even be the threads on either the plug or cylinder head weren't cut to spec.
Today's diesel engines do not use spark plugs.Today's diesel engines do not use spark plugs.
Yes, all gasoline engines must have spark plugs. Only diesel engines do not require spark plugs.
No. There are not "spark plugs" on turbofan engines. There are ignitors, which help to ignite the fuel during start, but unlike spark plugs, ignitors do not run constantly.
no
Yes, all gasoline engines have spark plugs.
ALL gasoline engines have spark plugs. Only diesels don't have spark plugs.
Diesel
Both V6 engines have 6 spark plugs
No, spark plugs do not cause ignition in diesels. The fuel compression causes ignition
Yes, it sure does. The only vehicle that does not have spark plugs are vehicles with diesel engines.
You will need 12 bocsh spark plugs. These engines have 2 spark plugs per cylinder.
Nothing. That is, literally nothing. It doesn't work. Diesel engines don't use spark plugs, because they don't need them.