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WakeWorld Discussion Board » >> Boats, Accessories & Tow Vehicles Archive » Archive through July 28, 2009 » Oil on spark plug threads? « Previous Next »
By Richard (nauty) on Wednesday, July 15, 2009 - 7:29 pm:    Edit Post Delete Post
I just changed the plugs on my boat tonight and noticed a small amount of oil on the threads of most of the spark plugs. The electrodes themselves looked normal with no oil deposits.

The boat has been running okay, it hasn't been hesitating or misfiring like it would if oil were making its way into the combustion chamber. I decided to change the plugs simply because they have 325 hours on them and I've started to smell unburned gas in the exhaust.

There is another issue I had the other day that may or may not be related.... The other day my oil pressure was running unusally high. In fact it was all the way at 80 psi. I checked the oil and it was fine. If anything it was a 1/2 quart low, so it couldn't have been too much oil in the system to cause the high pressure. I called my dealer while on the water and explained the issue. They told me it was probably a bad sensor or gauge.

Could the high oil pressure be related to oil on the plugs? Could the oil on the plugs simply be fogging oil that was still on the threads? The boat is 4 1/2 years old and has 325 hours on it. All the fluids have been changed regularly since the day I brought it home (I am the original owner).

Do I have something the be worried about here?

By Todd Morgan (skinny99) on Wednesday, July 15, 2009 - 7:55 pm:    Edit Post Delete Post
No worries! IMO Todd
By steve (ss1234) on Thursday, July 16, 2009 - 10:20 am:    Edit Post Delete Post
I read somewhere back in the day to put oil on the threads of a plug. Whenever I change them I wipe a little oil on the plug threads. I would only be concerned if the electrodes didn't look normal. (no expert, just an opinion)
By AtTheLake (bmartin) on Thursday, July 16, 2009 - 10:30 am:    Edit Post Delete Post
The oil could indicate a leak in the valve cover gasket or other gasket. If it was on all of your plugs, the gasket leak theory is less probable.
By Richard (nauty) on Thursday, July 16, 2009 - 10:45 am:    Edit Post Delete Post
Thanks for the feed back. The oil was on all but one plug. However, these plugs have never been removed since I bought the boat. Therefore, if oil was applied to the plug threads during installation it was done at the factory and has been on the plugs for 5 years.

I'll keep an eye on it and see if the motor starts running poorly or if the exhaust starts turning black.


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