Question about 2002 Nissan Maxima

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I have an oil leak in a spark plug chamber how do is fix it

While changing my spark plugs i found oil in one of my spark plug chambers

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  • Nissan Master
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Depends where the oil came from.of it has leaked down from a valve cover gasket,that is not hard to fix.if it a leaking valve seal that is expensive and if the head gasket is leaking,expensive.look at the outside edge of the valve cover,and check the edge for oil.if there is alot of oil,by the time the plug is unscrewed oil can go inside.the oil would burn off,so if there is oil inside it is dripping down probably from a valve seal.take off the valve cover and inspect the seals they are probably no good.there are 2 seal sets,one is in the valve cover,and that results in oil on the outside of the plug,and the actual valve seal which results in oil in the inside of the engine.

Posted on Jul 13, 2009

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  • Master
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Change the oil seals on the valve cover and sparkplug Chambers. (usually they come as a set) Hopefully this helps!!

Posted on Jul 13, 2009

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1 Answer

Does anyone know the spark plug wire order on a d15b7


Oil is leaking into your spark plug holes from the valve chamber. It's not a good idea to leave the oil in the spark plug holes, as it can pool high enough to damage the rubber boots of your spark plug wires, will make the plug hole really messy, and it may eventually become a fire hazard. Below is how to fix it.

Honda's preferred spark plug location means that the plugs (and their wires) must pass through deep recesses in the top of the valve covers to get to the combustion chamber. This gives better plug placement in the combustion chamber, and more zoom for your Honda. It creates a small problem though: Under the valve cover, all around the spark plug recesses, is an open space that is constantly being showered with oil, and that oil will get into the spark plug recesses unless something is done to keep it out. Honda does this by sealing any joins between parts with little rubber donuts (AKA "grommets").

The rubber donuts eventually get old and stop sealing, letting oil seep into the spark plug holes and puddle there. The cure is replacement of all four (or six), along with the valve cover gasket itself (themselves) at the same time. It's an easy project for anyone who's done more than just oil changes.

However, there's a fly in the ointment here: Certain Honda engines, specifically the 4-valve-per-cylinder, single-overhead-cam ones (such as the D15B that's used in many Civics), have an additional rubber seal under the one I just mentioned! This one also gets old and starts leaking, but these are a LOT harder to replace! Not a job for a beginner!

NOTE: The rubber parts under discussion here are not actually red and orange, they're black, I just used colors to make it clearer which was what.

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I had a spark plug pop out on me at the red light up the street from my house got the car home the next morning i change all the plugs and now my car is smokin real bad and i put a paper nakin behind the...


Typically a well tighten spark plug will never back it self out so this and maybe a few others were not tightened properly the last time the plugs were changed. You probably have been blowing some smoke from that same cylinder for some time. This could be from worn valve guide seals, blown head gasket or worn out rings. These Z engines are usually pretty bullet proof on the bottom ends but issues with head gaskets or valve guide seals can happen more often. With all the oil being sucked into the piston chamber and the added pressure as you can not compress oil, this could have push an already semi loose spark plug out. Any thing could have happened at this point. The possibilities of metal thread fragments falling into the chamber ,as the plug tore the last few threads and it was forced out, could have caused some damage to the cylinder walls (although this is rare). Also, if additional oil came into the cylinder chamber and you started the engine (after the new plug was installed) this could have almost caused hydrolock situation. Since the engine did turn over and start then instead of the oil locking the engine it could have blown a seal or gasket more if there was already a small defect that let the oil into the chamber in the first place. This would cause a more sever leak and a more noticeable smoke. Try pulling the same spark plug out and running the engine to see if the smoke lessons or stops. You can also get ahold of a cylinder compression gauge to screw into the spark plug hole and check the reading against all the other cylinders. Either way though, once you are burning oil there is no easy fix (please do not waste your money on any oil additives that claim to stop oil leaks as those never work in such situations). As far as the oil gauge not working; it is very unlikely that this is related. If the oil gets so low from burning it all off through the engine then the pressure could start to be erratic but only if you were almost bone dry would it not register at all. I'm sure you have checked the oil and added more if it was low and that would have brought the pressure up again. Hopefully you have been changing the oil regularly as this is the main key to keeping any engine running for years without these issues of these kinds.

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1 Answer

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