Question about 1989 Ford F 150

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I have a 1989 f150 that is leaking oil from some where on top of engine. I just replaced the rear main seal and valve gaskets look good. The oil is dripping down the bell housing.

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That's a good one. Really aren't too many possibilities other than head and valve cover gaskets. I would give the engine a good degreasing and drive for an hour or so. If the engine isms clean it should be fairly easy to trace the leak. Was the rear cam seal checked?

Posted on Mar 12, 2011

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Start at the top of the engine and work your way down, intake manifold end gaskets possibly, try some leak detector spray. Looks like a powder when it dries....spray it on the area of the engine you suspect the oil is leaking from, let it dry......go drive it for a bit and recheck.....use an inspection mirror, the oil trace will show up as a dark streak when it leaks. Try NAPA. Good luck.

Posted on Mar 12, 2011

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    Here is the oil leaking Problem Identifying Technique

    Engine oil leaks from the valve cover gasket are common.
  • The intake manifold plenum gasket may leak and cause increased oil consumption/burning and a spark knock during acceleration; the gasket should be replaced.
  • External oil leaks from valve cover gaskets, intake gaskets (front or rear), and the rear crankshaft (rear main) seal area are common. The rear main seal is an unlikely source. Normally, the bearing cap mating surfaces (as well as the sealing surface between the oil pan and bearing cap) are the source for the leaks.
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  • If the oil filter casing shows signs of distortion from excessive oil pressure, the oil pump should be replaced.
  • Often misdiagnosed as a leaking oil filter gasket, the oil filter adapter can seep from between the adapter and engine block.
  • Carbon buildup on the top of the piston is common. As the buildup increases with mileage and over time, symptoms may vary from light ticking, to ticking/hammering, to hammering/knocking noises. Fuel injector cleaner often solves the problem.

  • I think it helps to analyse u r Problem

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