This is topic Pulled a spark plug and tons of oil! in forum Tech Talk at Northern California Ford Owners .
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Posted by imbroken (Member # 165) on
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Pulled a plug on my friends blown cobra... and boom full of oil and fuel... could this be the seal seat for the plug? or... maybe a piston ring?
Posted by shade-tree (Member # 298) on
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oil is typically blow-by.
outside chance of valve guides (probably only if heads poorly machined or pretty high mileage)compression check is in order, then leakdown (depending on results)
Posted by imbroken (Member # 165) on
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compression check is being done.. shade, what is a "leak down"?
I pulled the stock plug.. put in a new plug.. cleaned the area.. made sure the plug was threaded in.. went for a short cruise and boom here comes oil again.. only on the #8 cylinder... my bud just got a whole new long block from ford.. hmm... probably their error...
Posted by PunkINa5.SLOW (Member # 10) on
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Does is smoke worse upon deceleration?
Posted by shade-tree (Member # 298) on
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leakdown is when you have compressed air, get a spark plug fitting, and there's a procedure where you basically take pressure readings over time. It shows you other things that a compression test can miss. (most people don't have the tools/setup for it, but a compression checker is like $35 at sears)
Posted by JUSTIN (Member # 586) on
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WHAT YEAR COBRA? IS IT A PUSHROD 302? IF THE VALVES DONT OPEN IT CAN PULL ENOUGH VACCUME TO PULL OIL PAST THE RINGS