I despartely need some help. 1992 Corolla 1.6l, 4afe engine. I have oil in 3 spark plug tubes. There are seals in the cylinder cover for each tube. I have already replaced them and still have oil in the tubes. Are the tubes in the 4afe screwed in or pressed in? The toyota manual says pressed in but my local toyota tech says the manual is wrong. Does anyone know the answer? If they are pressed in does any one know if they can be removed and resealed without taking the head off? Thank you.
Pressed and no you have to take the head off and take it to a machine shop to replace them. Tho I wonder how the oil is getting into the sparkplug tubes, if the seals were replaced, because they're not "OPEN" from the bottom end of the tube. So unless its pouring from up above, then I dont see how oil can get in there.
Pressed and no you have to take the head off and take it to a machine shop to replace them. Tho I wonder how the oil is getting into the sparkplug tubes, if the seals were replaced, because they're not "OPEN" from the bottom end of the tube. So unless its pouring from up above, then I dont see how oil can get in there.
Thank you very much for your answer. At 84,000 miles oil was found in one tube. I replaced all four seals with fel-pro aftermarket seals. At 98,000 miles the car was sluggish. Three of the tubes had oil up to the hex nut on the plug. I suspect the ignition voltage was being drawn away from firing the plugs by the oil. I again replaced the seals but with OEM Toyota seals. I checked after 200 miles on the new seals. Just the end of my spark plug socket is coming up with oil on the same three tubes. May be the oil is left from the last time? I didn't push a rag in the tube to clean it. I assumed all the oil would drain into the cylinder when I took the plugs out and get burned up first time I started the car after the repair. Do you think it would be worth while to wait some more miles and see how much accumulates? Maybe I am jumping to conclusions.
Last edited by uncle-vinny; 05-31-2006 at 05:02 PM.
It may just be as simple as checking the gasket on your oil filler cap on top of the valve cover. Is it possible that the oil gets in from there? I cannot recall as I only owned a 2000 Corolla before. What about the valve cover itself? Are you doing the reinstallation so that you can see that due care is being taken?
out here in the PI we encounter same problems with the 4afe too, although mine is a 4af carbie, i have same problems too... i had it replaced twice only too find out that it leaks again.... i also believe that it is being pressed along with some sealant on it..... they say it a common problem for the 4af... but im hoping we could fine solutions
"they say" As in the scammers in banawe or dealership guys?
Problem with removing the tubes is that you have to heat the head and then pull them out while its hot, heat it and cool the tubes to be pressed in and then press them in and when the head cools and the tubes warm, they interlock, but the risk of getting your head warped is also there.
It may just be as simple as checking the gasket on your oil filler cap on top of the valve cover. Is it possible that the oil gets in from there? I cannot recall as I only owned a 2000 Corolla before. What about the valve cover itself? Are you doing the reinstallation so that you can see that due care is being taken?
Good luck.
I have checked the oil filler cap frequently and there is no oil leaking out of it. The valve cover was installed with a new gasket and sealer used as recommended by the Toyota shop manual. New gromments were installed under the hold down nuts and the nuts were torqued to manual specs.
Thank you very much for your answer. At 84,000 miles oil was found in one tube. I replaced all four seals with fel-pro aftermarket seals. At 98,000 miles the car was sluggish. Three of the tubes had oil up to the hex nut on the plug. I suspect the ignition voltage was being drawn away from firing the plugs by the oil. I again replaced the seals but with OEM Toyota seals. I checked after 200 miles on the new seals. Just the end of my spark plug socket is coming up with oil on the same three tubes. May be the oil is left from the last time? I didn't push a rag in the tube to clean it. I assumed all the oil would drain into the cylinder when I took the plugs out and get burned up first time I started the car after the repair. Do you think it would be worth while to wait some more miles and see how much accumulates? Maybe I am jumping to conclusions.
I am having the same problem and I was wondering if you had to drain the oil from the car first. I don't want to pull the valve cover off and end up with oil everywhere. Thanks for the help.
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