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Thread: 7.3 IDI leaking transmission fluid into motor oil

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    Question 7.3 IDI leaking transmission fluid into motor oil


    I have a 94 7.3 idi turbo that leaks transmission fluid into the motor when the transmission cooler is connected. I plugged the transmission ports that feed the cooler and the leaking stopped. My guess is that the cooler is causing some sort of pressure difference that is forcing the fluid into the motor.

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    Supporting Member OLDBULL8's Avatar
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    There shouldn't be any connection between the engine and transmission. Are you talking about an auxilliary transmission cooler mounted in front of the radiator? You do have an automatic trans, right?
    A fart is just a turd blowing it's horn for the rightaway.

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    Using the Force! Agnem's Avatar
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    Where is this "leaked" transmission fluid showing up? In the motor oil, or the coolant. If in the motor oil, how do you know that this is happening?
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    Sounds like a leak in a rad tank cooler to me! Getting trans fluid into the coolant and contaminating the coolant, caused by pressure differential of trans pressure and coolant pressure

    maybe wrong...

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    Quote Originally Posted by riotwarrior View Post
    Sounds like a leak in a rad tank cooler to me! Getting trans fluid into the coolant and contaminating the coolant, caused by pressure differential of trans pressure and coolant pressure

    maybe wrong...

    JM2CW
    X2 Coolers can fail with age. A good radiator shop can fix it.
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    Transmission fluid is showing up in motor oil - I can tell because motor oil level goes up and trans fluid level goes down.

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    EO4D transmission - fluid gets into motor using radiator cooler or auxiliary cooler.

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    I get transmission fluid in the motor oil with an auxiliary cooler with no fluid passing through the radiator.

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    There is no way for transmission oil to get into the engine crankcase oil, in a normal engine, transmission hooked together.
    Surely, no one would hook the transmission cooler return line into the engine.That would be the only way it could get there.
    A fart is just a turd blowing it's horn for the rightaway.

    You said what?
    I'm not Crazy, my Mother had me tested!

    "99.5 F350 7.3 PSD 4R100 CC LB 4X4 DRW 4:10 Centurion Conv.
    ScanGaugeII SPDiesel Performance Module 40-60-80 HP -- A Pillar - Boost - Pyrometer - Trans.Temp. - Engine Oil Temp.GN Hitch 20K -- Reese 16K 5er Hitch - Draw Tite Brake Control - Aux. Trans. oil cooler - 100 Gal. Transfer Flow fuel tank, W/Trax II computer. DIY black bed liner. Red Knight

    "92" F350 7.3 IDI CC LB DW E4OD US Gear O/U 4:10 Gauges EGT--Boost--Trans.Temp--Banks turbo White Knight

    AutoEnginuity with Ford Enhanced.

    My mind works lightening fast.
    One FLASH and it's gone forever.

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    paulw
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    you have my attention now iv been working on cars for over 20 years i never heard of that

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    this is gunna be good.

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    Would an external cooler lower fluid pressure in the transmission? I had the transmission off to replace the flex plate over the winter. Could I have damaged a seal?

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    Could you damage the seal? Yes, but a damaged seal would leak oil out, not tranny fluid in, fluid always goes from a high pressure area to a low pressure area, the crankcase isn't necessarily what I would call a vacuum.
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    && no, the external cooler should have no effect on internal pressures.
    1993 F250 XLT
    7.3 IDI, E4OD, 4.10 Gears
    Dana 50 Front Axle
    BB Injectors, DPS IP, Banks Transcommand, Banks Sidewinder Turbo Kit, Carter 4070 Lift Pump, Hydroboost, Hypermax Smoke Puff Limiter
    Warn Locking Hubs, Moog Tie Rods and Ball Joints, Billstein 4600's

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    Could the cooler cause the transmission fluid pressure to be higher than the crankcase pressure?

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