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Transmission oil leakage

292 Views 11 Replies 7 Participants Last post by  mtts60
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Hi last week after a driving in a hot weather (above 38 centigrade degree and above 150Km/h speed on a steep hill )I faced with this:




there was oil all over the ring and over the lots of things behind ,I thought it's the break fluid but it was not






upper side of transimission(Gearbox) is too much oil that I think oil is dropping from here in this image shows :馃憞馃憞馃憞馃憞馃憞


As you see there is alot of oil 馃憞馃憞馃憞馃憞馃憞


Is it possible that too much pressure as I mentioned at first ,resulted in a leakage from this part that I even don't know its name?Is it a safety valve to relief the pressure?
Dose anyone know this part's name and its job?


This is an Accord 2013 6AT.

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Yes, that's a vent hole. If there is too much fluid, as it heats up, it can spill out of that hole.
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Thanks for reply
Should I do anything?
How could I know how much oil has been wasted?
Can I add some oil to it?

I saw this link that is for a CVT transmission Honda CIVIC :


mine is not CVT and is a 6AT is the problem the same?
Is my vent plugged like the above links? and should I dechock it? if yes :
To remove the plug :
Is there too much force needed?
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Doesn't the 6AT have a dip stick? Just check the dip stick.
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Doesn't the 6AT have a dip stick? Just check the dip stick.
of course it does but just being in range is Ok?
The wasted oil is not important?
If all that fluid leaked out, and the dipstick still shows the level in range, it was probably over filled. Was a transmission service performed recently?
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If there is too much fluid, as it heats up, it can spill out of that hole.
This.

@Ghsouri , your situation has all the indications of an ATF overfill causing this problem.
  • Too much ATF, upper surface in contact with moving parts that the fluid in the sump should not be touching.
  • Anti-foaming agents in the ATF can only do so much (incidental contact), you start getting air-entrained ATF
  • Air-entrained ATF does not exchange heat at the cooler near as well as fluid ATF ... so ATF in the sump gets hotter, and expands, and the air entrained in it expands a lot
  • Foaming, expanding ATF makes further contact with moving parts, heats more, expands more, pukes out the vent (that round, black "rubber cap")
@BLCKFLSH is correct. If all that fluid puked out the vent, and the ATF level was good afterwards, you were overfilled.
You may have wrecked your load of ATF by thermal stress. Possibly. Since you don't mention the color of the ATF, and your car never stopped working (it just leaked out this stuff), you may be okay.

OF
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A lot of people end up overfilling these ATs because of improper level checking procedure. The level must be checked with the engine warm but turned off.
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This.

@Ghsouri , your situation has all the indications of an ATF overfill causing this problem.
  • Too much ATF, upper surface in contact with moving parts that the fluid in the sump should not be touching.
  • Anti-foaming agents in the ATF can only do so much (incidental contact), you start getting air-entrained ATF
  • Air-entrained ATF does not exchange heat at the cooler near as well as fluid ATF ... so ATF in the sump gets hotter, and expands, and the air entrained in it expands a lot
  • Foaming, expanding ATF makes further contact with moving parts, heats more, expands more, pukes out the vent (that round, black "rubber cap")
@BLCKFLSH is correct. If all that fluid puked out the vent, and the ATF level was good afterwards, you were overfilled.
You may have wrecked your load of ATF by thermal stress. Possibly. Since you don't mention the color of the ATF, and your car never stopped working (it just leaked out this stuff), you may be okay.

OF
Thanks all for kindly reply 馃尫

I changed the transmission fluid 4 years ago.
I know manual says 2.5L is needed but when oil was vacuumed there was about 8 litters .Then he filled with 8L oil.
Then he filled with 8L oil.
But did he perform the level check procedure per the owner's manual? (as mentioned by @WiiMaster earlier)

OF
Although the color rendition on my monitor could be questionable, that doesn't have the normal color of ATF fluid I would expect. Even burnt ATF. The following premise is based on the photos.

I believe the ATF fluid would be pushed out the vent under expansion pressures but if this ATF was replaced 4 years ago and was overfilled back then, the OP would have experienced more damage long ago (unless the car doesn't get used often) causing shifting problems with the transmission.

As described in his scenario near 100mph at 100F, uphill causing huge engine load, in that location I would also investigate the possibility it's the engine oil being sprayed out from somewhere. Some seal popped due to excessive engine pressure caused by a blocked something or another. IMHO

@Ghsouri can you take a white paper towel or rag and check the color of the fluid? There should still be a red/pinkish tinge to it still.

Do you know the engine oil level?
Do you know the engine oil level?
Good catch! If the ATF was overfilled, who's to say the engine isn't also overfilled.
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