replace valve cover gaskets & spark plug tube seals
NGK Iridium, is the best set of spark plugs for 200SX
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Under the valve cover there are seals on top of the plug tubes, you will need to replace the valve cover gasket and plug tube seals.
Could be a few reasons, and can't be pinpointed without me actually seeing it "in action". But here are the most likely reasons, in order of likleyhood: 1) Spark plug not tightened to proper specs. Fix: tighen plug to proper specs with torque wrench. 2) Spark plug "washer" bad or gone. Fix: Replace washer. 3) Spark plug seals bad. Fix: Replace spark plug. 4) Bad threads in spark plug hole. Fix: Retap, or "Helicoil" it. 5) Crack in head near spark plug hole. Fix: Replace head.
The spark plugs on a Ford Explorer are replaced by first disconnecting the battery. Remove the spark plug using a spark plug socket. Replace with the factory recommended spark plug.
It's probably The spark plug well gaskets. You need to remove valve cover and replace the gaskets for the spark plug wells and valve cover. it's a easy repair. It's probably The spark plug well gaskets. You need to remove valve cover and replace the gaskets for the spark plug wells and valve cover. it's a easy repair.
IF YOU MEAN THE OIL IS DOWN IN THE SPARK PLUG TUBE. THERE IS A SEAL THAT IS IN THE VALVE COVER THAT GOES AROUND THE TOP OF THE SPARK PLUG TUBE, THEY GET HARD AND START TO LEAK INTO THE TUBES AFTER A WHILE. YOU WILL HAVE TO REMOVE THE VALVE COVER TO REPLACE THEM.
valve stem seals
Get a spark plug socket and unscrew the spark plug and replace with a new one.
Spark plug tube seals need changing
The Nissan FSM says: 1.0mm-1.1mm