1. #1
    Join Date
    Dec 1999
    Location
    Virginia Beach VA
    Posts
    8,223

    Where is this oil coming from?

    I recently changed my rear main seal, so I had the oil pan removed. Before that, my jeep dripped a fair amount of oil from several locations (hard to tell with my oil pan skid plate). Now that the rear main is changed, my oil drips are fewer, however this is one that is perplexing me.

    I see oil on the boot on my front driveshaft - it would appear that it is dripping from higher up and landing on the boot before dropping onto the floor. Here is a photo looking up from under the Jeep


    Where is this oil coming from?-oil_drips.jpg

    I've wiped away the drips, but they seem to always come back. Any thoughts on where they could be coming from? Maybe a leaky valve cover?
    My 2005 Wrangler Build Thread

    He who is without oil shall throw the first rod. -Compressions 8.7:1

  2. #2
    Join Date
    Feb 2009
    Location
    Dayton Ohio Area
    Posts
    6,434

    Re: Where is this oil coming from?

    Thats your intake manifold but there is no oil in there. The runners lead back near the valve cover.
    The ccv tubes are above there.

    Take part cleaner and clean up all the oil off of the engine. Then start it and let it warm up. Shut down and look for leaks


    Is it brown or red? In front of there is your power steering pump.
    The fan will blow it back.



    Never look down on anyone unless you are helping them up - Jesse Jackson
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

  3. #3

    Re: Where is this oil coming from?

    i was wondering if it was being blown from the front somewhere since that is the bottom of the intake.
    03 rhd tj

  4. #4
    Join Date
    Dec 1999
    Location
    Virginia Beach VA
    Posts
    8,223

    Re: Where is this oil coming from?

    I hadn't really thought that the fan would blow the oil back - makes sense.
    I'll check my power steering levels, however it really does look like dirty oil.
    My 2005 Wrangler Build Thread

    He who is without oil shall throw the first rod. -Compressions 8.7:1

  5. #5
    Join Date
    Feb 2009
    Location
    Dayton Ohio Area
    Posts
    6,434

    Where is this oil coming from?

    Actually are you missing a hose on the shiny line with the bump/barb next to the steering shaft? Edit. Nvm Thats a gas line on my jeep.

    Stuff looks baked on.

    Where is this oil coming from?-img_3525.jpg


    Never look down on anyone unless you are helping them up - Jesse Jackson
    Last edited by JPNinPA; 04-19-2022 at 08:56 PM.
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

  6. #6

    Re: Where is this oil coming from?

    Terry,
    When you had the pan off to replace the rear seal, did you do a fore and aft movement dimension check of the crank?
    On my 2004, when I did the main seal, at about 175000 miles I found the Thrust Bearing (#3) almost worn through on the rear side. Indicating the crank was moving forward. Causing the rear seal to leak. No one has been able to clearly tell me why the crank would have forward pressure on it. Some say the Transmission can over pressurize causing pressure onto the Torque Converter. Others have said hogwash!
    I was able to replace the main bearings with the Oil Pan removed. I now have a new Crank and Bearings in the garage ready to go!!
    [IMG]DSC01433.JPG[/IMG]

  7. #7
    Join Date
    Dec 1999
    Location
    Virginia Beach VA
    Posts
    8,223

    Re: Where is this oil coming from?

    No, I didn't do anything like that.
    Honestly, I'm learning as I go here - I had never had that much of the engine apart before. I may have to do more research into what you describe though.
    My 2005 Wrangler Build Thread

    He who is without oil shall throw the first rod. -Compressions 8.7:1

  8. #8

    Re: Where is this oil coming from?

    thats called crank walk and when the engine is being built, you have to measure the end play (fore/aft movement) and put shims in place to keep it within spec. other wise, as noted, it rides against stuff and starts slowly eating through seals and stuff.

    i cannot remember what lets the crank move for and aft while in a rotational state. maybe just accelerating and decelerating? since the combustion forces are pushing down, its not like a turbine engine where air is moving it forward so i can only imagine its accelerating the vehicle and slowing the vehicle. but i know its really common to have crank walk and seals worn in air cooled vw engines if you don't specifically measure and shim the crank against the case and get the oil slinger in place properly.
    03 rhd tj

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