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Auto gear box leak

Discussion in '365 GT4 2+2/400/412' started by PeterMercedes, Oct 11, 2015.

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  1. PeterMercedes

    PeterMercedes Rookie

    Feb 17, 2014
    25
    UK
    Full Name:
    Peter
    #1 PeterMercedes, Oct 11, 2015
    Have a slight fluid leak from the auto box area on my '84 400i. Does anyone have a photo of the underside if the box, that is from the ground looking up? Cannot find such a photo on the Internet.
    Thanks
     
  2. Part Time

    Part Time Formula Junior
    Silver Subscribed

    Dec 16, 2013
    500
    Port St. Lucie, Fl
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    Gary Shore
    #2 Part Time, Oct 11, 2015
    Last edited by a moderator: Sep 7, 2017
    Here are some pics of mine....before cleaning.
    Just a few places to leak.....
    1. Oil pan, gasket can be replaced easily.
    2. Front transmission seal, or front pump gasket/o-ring, unit must come out.
    3. Rear output seal, also must remove trans.
    4. Seal at lower end of fill tube, not sure if can be replaced without removal, not much room.
    5. O-ring seal at vacume actuator on side, very close to floorpan, no room to remove.
    6. Seal at speedo sensor, more room here.
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  3. PeterMercedes

    PeterMercedes Rookie

    Feb 17, 2014
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    Peter
    #3 PeterMercedes, Oct 11, 2015
    Thanks Gary, that's really helpful, along with the list of things it might be. I intend to get the car warm, put it back in the garage and place a newspaper underneath, then look an hour later to see if it gives me a clue as to where it might be leaking. Although I expect to have to clean it all down first before really locating where it is leaking. Next job is to find a pdf file on the gearbox.
     
  4. simonc

    simonc Formula Junior

    Nov 1, 2003
    884
    Herfordshire, UK
    Full Name:
    Simon Campbell
    #4 simonc, Oct 11, 2015
    Peter - PM sent
     
  5. Part Time

    Part Time Formula Junior
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    Dec 16, 2013
    500
    Port St. Lucie, Fl
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    Gary Shore
    #5 Part Time, Oct 12, 2015
    Peter..
    ask around at your local auto supply for "leak check dye", then find a small cheap battery powered u/v light....pour in the dye and warmup the trans...the leak will glow blue or white under the u/v lamp.
    That should give you a place to start !
     
  6. jacques

    jacques Formula Junior

    May 23, 2006
    877
    Los Angeles/Florida
    #6 jacques, Oct 12, 2015
    You might also check the dipstick tranny grommet. Mine leaked from there once, way back when. It will leak from the bottom of the dipstick grommet and from the tranny until it finds its own level (like a diff when you fill it to the filler hole). Then it will stop leaking, and it will drive you nuts trying to decect it. Then when you start the car and then stop it again, it starts all over again. Hope this is of some use to someone. Thanks. Jq.
     
  7. Al Campbell

    Al Campbell Formula Junior
    Owner Silver Subscribed

    Nov 22, 2013
    581
    Australia
    #7 Al Campbell, Oct 12, 2015
    The selector shaft seal has dried out on mine & leaks if I let it sit in neutral but not in Park where it has hardened into that shape.
    These seals are cheap but not easy to get out. I purchased a seal remover tool but there is not enough space to use it. I have also read that the selector shaft can be removed & the seal replaced with the drain pan off so I will do this next time I change the filter.
     
  8. SouthJersey400i

    SouthJersey400i Formula 3

    Mar 14, 2007
    1,679
    Romulus, NY (Finger Lakes)
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    Ken Battle
    #8 SouthJersey400i, Oct 12, 2015
    I fought ATF leaks for years. The original steel pan flanges bend at the bolts. I change to a Aluminum pan which is rigid and still had leaks because the pan came with SS bolts which did not hold torque and loosened. Once I replaced those bolts and used a composite gasket (not paper or rubber) I have no more leaks. Summit Racing is place to get Ali pan.

    Gary was it, you can change the rear seal with tranny in car but the diff and drive shaft must come out; I did it two years ago.
    Ken
     
  9. rustytractor

    rustytractor Formula 3

    Mar 25, 2012
    1,078
    London
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    Russell Schacter
    #9 rustytractor, Oct 13, 2015
    Mine leaks as well.

    I just put more fluid in when it gets low.

    Simple solution !
     
  10. tbakowsky

    tbakowsky F1 World Champ
    Consultant Professional Ferrari Technician

    Sep 18, 2002
    19,949
    The Cold North
    Full Name:
    Tom
    #10 tbakowsky, Oct 13, 2015
    Not to mention the benefits of automatic undercoating..:)
     
  11. PeterMercedes

    PeterMercedes Rookie

    Feb 17, 2014
    25
    UK
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    Peter
    #11 PeterMercedes, Oct 15, 2015
    Thanks for all the advice and help so far. It is not a big leak but I find it annoying as it spoils my newly painted garage floor, which I did just for the 400i. Fortunately my Triumph Vitesse, which I have had for 20 years, has not sulked because of the special treatment given to the 400i.
    As an interim solution I also like rustytractor's method of just adding more fluid!
     

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