Burning Oil #5

Discussion in 'SN95 4.6L Mustang Tech' started by bhuff30, Oct 19, 2013.


  1. bhuff30

    bhuff30 Founding Member

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    I bought a PI 4.6L engine for parts. The seller said it burns oil on #5, and I have seen videos of it (litteraly spits oil out the exhaust). Compression was perfect hot and cold (210 and within 3 psi across all), no water in the oil. On teardown, the headgasket appeared fine (hard to tell since it is a multilayer steel gasket). The cylinders looked fine. What I did see, is oil in the #5 intake port, and of course a black plug and wet exhaust on that cylinder.

    So why would there be oil in head? Nothing before the valve stem is wet, but it got a new valve stem seal. It looks as if the oil is coming from a casting line that runs from the intake valve towards the valve stem? BTW, the engine only has 28k and was pulled from a wrecked car. Possible the impact cracked the head?
    #1
  2. Mr. Rustypwnz

    Mr. Rustypwnz Advanced Member

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    Doubtful. It would have smash the timing cover in well before it did that.
    Pull all the valves out, check guide play. Ive had this happen a couple times on these things.
    #2
  3. 1987stangman

    1987stangman Member

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    Plus one on valves.
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