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I don't think that this is supposed to be a maintenance item. I would guess you change them when they start leaking. On my friend's 2003 G35 sport coupe we were about to replace the spark plugs and we found a leaking spark plug tube seal:
http://www.YouTube.com/watch?v=G1G1LpksqPM
If you have any reason to remove the valve cover, and replace the gasket, you might as well go ahead and replace the seals. The gasket set should include new seals, as well as special washers for the cover retaining screws. (About $30.00 for a set.) There are little tabs on the thin sheet steel plate, inside the valve cover. You have to bend the tabs out of the way, before knocking out the old seals. A screwdriver and mallet should do the trick, but take care not to scratch the bore (the sides of the hole in which the seal fits). It will be nice if you can press the new seals in, instead of knocking them in. Bend the little tabs back, and you are ready to go.
What else can I help you with?
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Remove the spark plug wire from your 2001 Mercury Grand Marquis. Remove the spark plug with a 5/8 deep well socket, white turning it to the left. Reverse the process to put in the new spark plug.
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Why is there oil on the spark plug threads?
valve stem seals
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Spark plug tube seals need changing
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when do you have to change a spark plug and how many miles when do you have to change a spark plug and how many miles
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They seal oil/water/dirt out of the plug tube.
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If it is a 3.2 V6, it's the spark plug tube seals.
How do you change spark plug tube seals on 2003 nissan altima?
2.5 engine you can only buy a new valve cover from dealer
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Jaguars have plug seals.
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replace valve cover gaskets & spark plug tube seals
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To replace the spark plug seals on a 1999 Lexus ES300, first, remove the engine cover and disconnect the ignition coils by unscrewing them. Carefully pull the coils out and then remove the spark plugs using a spark plug socket. Replace the old rubber seals on the spark plug tubes, ensuring they fit snugly, and reassemble by reinstalling the spark plugs and coils before securing the engine cover back in place. Always check for any oil leaks after reinstallation.
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100k miles or 80 if your conservative..
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The seal on the top of the plug tubes are leaking. You need to change the valve cover gasket and plug tube seals.
