Oil Filler Tube (the last thread on this issue)

Lincoln LS

  1. GreyWisent

    GreyWisent Active LVC Member

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    My oil filler tube / pipe (the hole through which you add engine oil) has been bugging me for a while. It's been leaking for a good couple of years and sweating oil all over my LH valve cover and intake manifold.

    Aside: I know there's some debate on whether or not to call them "cam covers" or "valve covers". I agree that it's the cams that they cover, but the manual refers to them as valve covers, so I will follow that.

    I imagine most of you have this issue and just bear it since all your cars are almost as old as mine (2003, Gen 2 sport, V8), but no one talks about it. I dug through 22 pages of google search results and only found 5 threads on this topic. None of them really offer any solutions. There's nothing in the manual about this either. So the purpose of this thread is to log a definitive answer to this trivial, yet annoying nuisance. I can only talk about the V8, so if anyone has any info on the V6, please chime in.

    I haven't done this yet, but will update the thread once I do.

    The issue is that this tube has an o-ring seal at the bottom, which, like all rubber seals, dries up with time and leaks. I haven't been able to figure out if you can get that seal by itself, but I have some speculations (more on this further along).
    The new tube (XW4Z-6763-AA) comes with the o-ring already installed and an oil fill cap for about $40. You can find it at Tasca (XW4Z-6763-AA), or at FordPartsGiant (2W4Z-6763-AA) for a couple of bucks more. The XW4Z-... p/n is marked as discontinued at FPG at time of writing, so try both numbers. (When desperate, I've had some luck with replacing the X with number from 0-6, or playing with the revision code - the last 2 letters. You just have to more research to make sure it actually fits your car.) Tasca claims that these tubes only fit both generations of the V8 (NOT the V6).
    If you're looking for just the cap: 2W4Z-6766-AA (Tasca | FPG). Tasca claims that these caps don't fit the Gen1. This doesn't make much sense though, if it's the same tube.

    You will have to remove your LH valve cover to do this, so it's great to have this ready when changing those valve cover gaskets. There are two claims (but looks like only one of them actually did it) in the other threads that you can remove the tube by turning it really hard. I would no do this with plastic parts, but if you want to risk damaging your valve covers and hunting in jankyards to replace them, as well as picking plastic shards from under your cam shafts, by all means, roll the dice.
    And here's why: the bottom of the tube that attaches to the hole in the valve cover has two wings that hold it in place, and you would remove it by twisting it. However, there are two tabs that prevent this, as you can see from the images. Forcing those tabs can either make them buckle or lodge in harder and snap; my money is on the latter.

    I have already changed my valve covers 2 years ago, but did not know what I was doing at the time and left this alone; hopefully people who do this in the future will be able to use the knowledge here and not make the same mistake. I will remove them again for the sake of getting this done.

    Some poking around has led me to believe that p/n W705327-S300 (Tasca | FPG) might be the the o-ring I'm looking for (HM1 in the diagram), but at this point, this is pure speculation. I will buy one and report back.
    PLEASE LET ME KNOW IF THIS SEAL P/N IS ALREADY FAMILIAR TO YOU!
    A9Y4_1_201604221172526153.jpg
    Only unmarked seal here is the one I need: Seal | FordUS

    Other images of the filler tube: (Notice the locking tabs)
    0ea239db8265c02c4db191d43f259f6b.jpg
    Top right and bottom left of the bottom opening have wings that hold it in place; 90 degrees ccw you see the locking tab I mentioned. To me, they don't look like they'd give up in a fight.
    87e160c3975f986ae4f2e0f32c5af310.jpg
    c29a5efa361445dff7128afda6c26248.jpg
    d0fa9305030bc7d0fdb3fe92dd7ca13c.jpg
    75c03a51a6c44f12f9092c6b0224e1b8.png

    Other sources:
    oil filler tube o-ring...
    anyone remove the oil filler neck?
    Leaking Oil Fill Tube
    Oil filler tube stock part number ?
    oil filler tube leaking


    P.S. If you're looking for info on leaks from the VCT seals, the valve covers don't need to come off to change those. See these two threads:
    What are these sensors that should not be leaking like this.
    Oil Leak - Cam sensors? 03 LS V8
     
    Last edited: Sep 13, 2018
  2. joegr

    joegr Dedicated LVC Member

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    The gaskets on my oil fill caps have also started seeping.
    I suspect that it might be better to just buy the whole tube assembly, since the odds of the ears breaking off of the old one during removal seem high.
     
  3. GreyWisent

    GreyWisent Active LVC Member

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    Yep. When plastic, oil and heat meet, plastic never wins, or at least isn't likely to survive any more physical abuse. :(

    My plan is to take on for the team here and try out that seal. If it's not the correct one, or something breaks, I'll run over to the dealership and trade one of my legs in for a new filler tube.
    For anyone following, I risk throwing away more than half the price of the full tube and I think my odds of winning are low. Main reason I'm doing this is out of curiosity ("for science").
     
  4. oddball

    oddball Dedicated LVC Member

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    Heh, good luck. I spent a couple of years trying to get the bottom o-ring with no success. I also tried multiple generic o-rings from the local (well stocked local store - not a big box) hardware store. No good.
    Finally just RTV'd the snot out of it. It's sealed! It doesn't need to come off anyway.
     
  5. GreyWisent

    GreyWisent Active LVC Member

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    Oddball, do you by any chance have a list of o-rings that didn't work?
     
  6. oddball

    oddball Dedicated LVC Member

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    No, it was the standard hardware replacement stuff in the nearest sizes (larger and smaller) and thicknesses (larger and smaller).
    IOW, generic hardware replacement o-rings aren't close enough.
     
  7. GreyWisent

    GreyWisent Active LVC Member

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    I can confirm that -W705327-S300 is the CORRECT oil filler tube gasket (to valve cover). Bought and installed myself. Have not driven yet though.

    Will post pictures soon.

    Also confirm that it is not possible to unscrew the tube without removing the valve cover and pushing the tabs from below (exactly for the reasons explained in my original post).

    The tube is removed by pushing the tabs in slightly (from beneath) and turning the tube counter-clockwise just a bit less than 90 degrees. The tabs actually spread out more if you try to turn the tube without pushing the tabs in. I encourage everyone to hold the filler tube every time they open the oil cap. The tabs are actually surprisingly malleable and not brittle as I would expect plastic to become after 15 years of constant oil and heat exposure at 130k miles.
    I noticed some extra plastic material around the tube mating area, left over from the valve cover plastic molding process. If this were placed differently, then it might push on the tabs and explain why someone might be able to unscrew the tube without pushing the tabs in.

    I imagine there might be a tool (or opportunity to build one) that could be inserted through the top tube and pull on the tabs, allowing the tube to be removed.

    Miscellaneous: My Victor Reinz VS50397 gasket (same product as Mahle) is still holding strong after 3.5 years and 15-20k miles. HOWEVER, 3/4 of the spark plug tube gaskets that came with the set are leaking. NOT impressed! Especially since it was more expensive than the Fel-Pro kit and I chose them for better quality. Ordered 3W4Z-6C527-AA (4 each side) to replace them, but they'll be a while (backorder). Should have bought the Motorcraft kit (LH: 3W4Z-6584-AB ; RH: 3W4Z-6584-BB) to begin with. Does it actually come with VVT selenoid gasket, as pictured? I ended up spending more money and time in trying to save.
     
    Last edited: Oct 12, 2018
  8. GreyWisent

    GreyWisent Active LVC Member

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    Can't update original post with this info (looks like the forum has a 10000 minute i.e. 7 day limit on editing). Sorry.

    I think it would be useful for "tech" articles if that limit were not imposed and the thread owner could update the original post with updated information. That way, subsequent users would not have to dig for information.
     

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