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What causes the spark plug wells to fill with water/ coolant?

Tiny
KCROB
  • MEMBER
  • 2004 LINCOLN AVIATOR
  • 130,000 MILES
Had to replace #7 coil. In the process, noticed a couple of the spark plug wells were filled with oil. Cleaned the wells, replaced the valve cover gaskets, grommets, and spark plug gaskets. Granted it up and still had a misfire. Checked the coils again, but this time, we had water/coolant in the wells on the drivers/left side only. What causes this problem?
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Thursday, March 29th, 2012 AT 12:27 AM

3 Replies

Tiny
DRCRANKNWRENCH
  • MECHANIC
  • 3,380 POSTS
It is more than likely a head gasket leak or if you are lucky an intake manifold leak.
To test for head gasket leak get a coolant pressure system test done. Also, change your oil and look for milky substance in oil, thatis coolant. If the test fails or there is coolant ain the oil, you need to replace the head gasket. Ohterwise you may get away with an intake manifold gasket.
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Thursday, March 29th, 2012 AT 12:38 AM
Tiny
KCROB
  • MEMBER
  • 2 POSTS
Thanks Dr Crank for the quick response. We checked the oil and its good. There no water leak before we changed out the valve cover gaskets. There was oil in both sides of the spark plug wells, now only on one side. There is a suction/air hose that goes in the top of the valve cover. Is there a possibility that water is coming in from there, since water is concentated in the rear e spark plug wells?
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Thursday, March 29th, 2012 AT 1:31 AM
Tiny
DRCRANKNWRENCH
  • MECHANIC
  • 3,380 POSTS
No that is an exaust gas or PCV valve vacuum lead.
You probably pinched the gasket when putting it on. You should use silicone sealant, just a little, on them to assure a seal and that they stay in place.
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Thursday, March 29th, 2012 AT 6:58 AM

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