S2000 Under The Hood S2000 Technical and Mechanical discussions.

Oil on spark plug, not where you think....is this a problem?

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Old May 25, 2017 | 09:28 AM
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Default Oil on spark plug, not where you think....is this a problem?

The entire plug is wet save for the part in chamber....car runs perfect just changing plugs for maintenance. This is plug one, furthest from the fire wall...... so do I have an issue here or did whoever put in the plug oil it?? Any help please advise...also just noticed these are not the factory plugs, these are denso....
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Old May 25, 2017 | 09:32 AM
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Another angle
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Old May 25, 2017 | 10:28 AM
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Originally Posted by Novotz
Another angle
was the ignition coil boot wet with oil ? If so the spark plug tube seals are bad
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Old May 25, 2017 | 10:34 AM
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No, they were dry. It appears the previous owner may have put a little oil on the plugs. Why, I have no idea. It apprears to me the burn pattern and color are right on so I really am not concerned at this point. New plugs in runs like a champ again.
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Old May 25, 2017 | 05:34 PM
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What torque did you tighten the spark plug?
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Old May 25, 2017 | 05:40 PM
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18 ft lbs. I followed the write up on the forum here.
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Old May 25, 2017 | 08:42 PM
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Try new plugs and tightened to 24 ft-lbs. See if that stops the the leakage issues.
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Old May 26, 2017 | 05:11 AM
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I don't see how that would help OP, if it's the threads and not the plug tip covered in oil, then it's likely tube seals that are letting oil seep in.
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Old May 26, 2017 | 05:25 AM
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My running theory is this: The gentleman I purchased the car from was a 65 year old guy who was into muscle cars but purchased this one for his wife. My guess is when he swapped out the plugs he put a coat of oil on them. I've seen my Dad and his buddies do the same thing on their old muscle cars, I'm not to sure why and never thought to ask. Maybe some thing to do with old iron heads and not wanting the plugs to corrode in the hole, a make shift anti-seize if you will. I do not want to go to 24 ft lbs. especially with residual oil in the hole as I'm afraid to over tighten them. I plugged the motor (pun intended) and will pull them back out after a couple of weeks to inspect. I am not super concerned about this whole thing and there are no other signs of anything being wrong or the car using oil. Thank you for the feedback though I've been learning a lot on the site and owning this car is a dream come true for me. I enjoy hearing the opinions of others on the topics.
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Old May 26, 2017 | 07:43 AM
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24ft lbs is more than safe, you can probably go double that, although not recommended for the plug itself.
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