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Thread: D4 7u oil in fuel tower??

  1. #1
    Join Date
    Dec 2019
    Location
    Columbus, ms 39701
    Posts
    44

    Default D4 7u oil in fuel tower??

    I decided to drain all of the old diesel out of my d4 7u including the tower. Plan to change those sock filters in there. The thing is that I pulled them out and found old black oil in there underneath them. There wasnt any on the filters at all but there is near the bottom and in the bottom of that tower. When I loosened the plug to drain, it drained probably about a cupful out of there and then the diesel drained. I've attached pictures because I couldn't find this question being asked anywhere. Is this normal or what's wrong if not?
    20200118_103337.jpg20200118_103415.jpg

  2. #2
    Join Date
    Nov 2007
    Location
    NW Ohio
    Posts
    3,668

    Default

    Its most likely old paraffin wax from old diesel fuel that settled out or it could be the seals on the transfer pump let oil seep in over the years. At the base where it mounts.

  3. #3
    Join Date
    Nov 2006
    Location
    McBEE, SC
    Posts
    2,387

    Default

    Sounds like excellent Cat engineering for that era to provide both a reservoir for "stuff" to accumulate and a drain to remove it.
    D2 5u & 3J
    212 9T
    RD4
    D4 7J & 7U
    R4 4G
    Gas 35's
    Diesel 35
    Diesel 40
    Gas 50's 5A
    Diesel 50 1E1755
    Diesel 75
    D 8800 power unit 9J 6113SP
    LeTourneau D4 tournapull/Q Carryall
    Letourneau D Carryall's
    LaPlant-Choate CAB-97

  4. #4
    Join Date
    Nov 2006
    Location
    Malfunction Junction, NW California
    Posts
    846

    Default

    That's normal for there to be brown sludge in the filter housing like that, and that much is not bad at all, the filter system is doing it's job.

  5. #5
    Join Date
    Dec 2019
    Location
    Columbus, ms 39701
    Posts
    44

    Default

    Ok thanks guys! I'm cleaning it out good. Hopefully fresh diesel will make a difference in cranking it. It's harder to crank than it should be so far

  6. #6
    Join Date
    Aug 2019
    Location
    Washington
    Posts
    80

    Default

    On another note, oil also works as fuel.

    As long as the fuel filter does its job, you can basically pour your used oil or almost any oil into your fuel tank to fuel your tractor. Vegetable oil, peanut oil, engine oil, probably even crude oil.

    However, oils tend to be a bit thicker than diesel fuel, so depending on temperature and the oil you use you may need to add some heat. Or just adding some oil to a tank of diesel fuel would be okay as the diesel would help thin it out.

    I also hear of people mixing gasoline with their used oil before putting it in their fuel tanks.

    So, oil in the fuel system isn't necessarily a bad thing unless it is taking it from the engine lubricating system and using it up.
    Cat D6 5R

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