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Oil on Spark Plug Threads

Discussion in 'Engine/Tuning' started by Mobil1Mach, Jan 13, 2018.

  1. Mobil1Mach

    Mobil1Mach Member Established Member

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    I have a 2004 Mach 1 but Im posting this here due to heavier traffic to this sub-forum, and the similarities between the motors (heads specifically).

    I changed my spark plugs and COPs this AM and found this on cylinder 8 (firewall/passenger).

    av6f50.jpg

    In addition, there was a tiny amount of oil on the face of my socket head when I removed the old spark plug.

    I also found this odd build up inside the COP seat on the valve cover. What am I seeing here?

    15ri1dx.jpg

    Valve cover gasket? Piston ring? What is the most likely cause of this?

    Details on car: Bone stock internals. CAI/x-pipe/cat back/mild tune. Makes 317/320. 25,017 miles.
     
  2. slo984now

    slo984now AKA 01yellerCobra Established Member

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    It's the grommet that goes between the valve cover and cylinder head. They're known to go bad.

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  3. Mobil1Mach

    Mobil1Mach Member Established Member

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    That sounds like a pretty straight forward fix.

    Maybe a good excuse to pull both covers and get them powdercoated...? :)
     
  4. DSG2003Mach1

    DSG2003Mach1 Well-Known Member Premium Member Established Member

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    pulling the valve covers can be a bit of a pain in the ass and make sure crud doesnt get in there while the covers are off. Replace the seals mentioned above along with new valve cover gaskets as well, re-seal the vc to timing cover with RTV as well.
     
  5. Mobil1Mach

    Mobil1Mach Member Established Member

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    The passenger side VC doesnt seem so bad if Im just replacing the gaskets/grommets.

    Is it recommended to replace both sides at the same time?
     
  6. 98 svt

    98 svt Well-Known Member Established Member

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    Yup, the donut gaskets on the cam covers for the plug holes. Very common. Easy fix though.
     
  7. Mobil1Mach

    Mobil1Mach Member Established Member

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    Anyone have an educated guess about the build up inside the COP seat on the VC?
     
  8. slo984now

    slo984now AKA 01yellerCobra Established Member

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    My opinion is if the driver side isn't leaking leave it alone. Unless you want to get them powder coated.

    The crud is probably just dirt and stuff that's gotten under the coil cover.

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  9. hotcobra03

    hotcobra03 Well-Known Member Established Member

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    I had oil..

    being vc gasket is reusable..i had use silicone on those seals .

    not a lot..

    I found it held seals to vc, during install they would fall off .


    looking at plug,,what' that gap..

    ours said 0.54,

    I had lower mine close to 0.40..

    my last set I went .032 being I added a 4lb lower.

    I'm using same plugs..they last forever..

    cyl 5..looks like old oil someone may have left before..

    a lot of us also have replaced the coils..these will go weak without any codes ,,cause slight jerk.

    ford racing did sell a set of 8 oem coils ..
    some other kits are also appearing.

    while your in our section..see sticks

    you will find the factor service manual..
    full pc version is a must..
    small version works on cell..

    here you will find info on where to put rtv when reinstalling and everything else needed to do work..
     
  10. Mobil1Mach

    Mobil1Mach Member Established Member

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    Gap was .56. I gapped the new plugs to .54. I replaced the COPs with MSD Blasters and the plugs with NGK Iridium XIs. It all seems to work well so far (one day lol).

    It all seems to be running well. I'll tackle the VC issue in the next week or two. Thanks to everyone for your input on this!
     
  11. bigmoose

    bigmoose Well-Known Member Established Member

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    The OEM COPs are known to be the best and most reliable. Might not matter on your N/A engine. Either way hold on to your stockers in case you have issues with the new ones.
     
  12. 03cobra#694

    03cobra#694 Masta03 Staff Member Super Moderator

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    5E98AE00-A864-405C-8B29-E87463DCE36A.jpeg Plugs with 11k on them. Tr6ix, car was breaking up like a bitch. Gap had opened up to over .036. Blowout
    New tr6 gapped at .032, golden. I have no idea why this happened. Oil on the threads too.
     
  13. hotcobra03

    hotcobra03 Well-Known Member Established Member

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    you can also post a pic of engine..

    ours has a few items in the way that need to be removed to get covers off and on,

    the cam towers are tall which require cover to come up before it can twist.

    clutch cable,brake booster,heater hoses,vacuum and electrical harness,

    thsee are some items that may need to be touched..
    some items may not work after brake booster move..cruise control deactivate switch is 1 that needs to be reset..


    it is a very easy job..
     

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