locating a leak on 200r4

Discussion in 'Transmission & Driveline Topics' started by pomartin, Feb 21, 2021.

  1. pomartin

    pomartin Veteran Member Gold Member

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    Dear all,

    my 200r4 swap is loosing oil somewhere and I'd need some suggestions.
    I have extreme automatics stage 2 200r4 instaled in 1980 camaro.
    Another thing I should mention is Derale Atomic-Cool 13950 oil cooler mounted in front of radiator above the front reinforcement bar.

    After a drive transmission case is oily. Upper part of transmission case is oily only on passanger side, meanwhile oil pan has oil everywhere.
    The vent area is dry.

    Now the car is sitting for the winter and top-end rebuild and I performed an experiment: cleaned the transmission with brake cleaner, so there was no trace of oil anywhere.
    Then I over-filled it, so part of the front seal is below oil level.
    I did not start it, I just left it sitting like this for few weeks... no traces of leak anywhere.

    This leads me to conclusion that oil gets out of dipstick, runs down to where TV cable and dipstick touches, from there a part going on tv cable runs to the point where TV cable touches transmission case and that is why passanger side transmission case gets oily when driving around... Does this sound possible?

    I marked oil level a tad below transmission pan gasket and checked with warm oil, transmission in park, engine idling.
    Would not oil seep out of dipstick tube only when severely overfilled?
    Any ideas on what should I look at?

    Other than one 4th gear switch failure transmission seems to be running great.

    Many thanks for your input.
     
  2. camaro71/holland

    camaro71/holland Veteran Member

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    How about the manual shaft seal?
     
  3. pomartin

    pomartin Veteran Member Gold Member

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    Just checked again.
    The only spot with slight presence of oil that I found was on wire connector. I'll change the O-ring seal and repeat the test.
    It could be that some other seal is leaking when the oil is hot and less viscous tho...
    Any idea on passenger side case being oily and top vent area dry?
     
  4. camaro71/holland

    camaro71/holland Veteran Member

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    When was the last time you changed the pan gasket? If it's leaking there, air stream might carry it up the case when driving.

    When changing the gasket, check also oil pan flange for straightness.
     
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  5. jthomas

    jthomas Veteran Member Lifetime Gold Member

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    I assume you checked the servo cover as a source of the leak?
     
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  6. pomartin

    pomartin Veteran Member Gold Member

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    Well the gasket is actually new... changed when I got aluminum pan, as I thought my steel pan is faulty.


    Servo cover is dry yes :)

    I replaced O-ring at TC lockup connector and removed over-molded part on the connector housing, which I think caused connector to leak.
    Now it'll sit some time till I get all the parts for top-end shipped in.
     
  7. 77 cruiser

    77 cruiser Veteran Member

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    How bout the filler tube where the tab is welded on to bolt to the bellhousing?
     
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  8. pomartin

    pomartin Veteran Member Gold Member

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    Nice one! I never thouht of this one.
    Will check
     

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