Oil comes out of breather on top of tranny

10

Asked by Nov 30, 2016 at 10:01 PM about the 2003 Mercedes-Benz E-Class E 500

Question type: Maintenance & Repair

2003 E500,  150 k miles. Had antifreeze in tranny. Replaced radiator and rebuilt the tranny. No leaking when not moving but when in gear fluid comes out of the top of the transmission at the breather. Shifts OK.

13 Answers

104,205

So it is either overfill or the tranny is running too hot. Did you check the cooler lines for any kinks or getting crushed during the repair work? I'm not a Mercedes man but from what some of my shop owner buddies have been saying is to bypass the radiator cooler and add on an auxiliary cooler out in front, they say that some of the rebuilders won't honor any warranties unless this modification is made. HTH

1 of 1 people found this helpful.
10

Well it didn't have too much fluid in it and it kept doing it till there wasn't enough in it to show on my dipstick. The lines are all in good shape with no kinks. I did hydraulic repair in the Air Force a few years back. It was driven very gently so it wasn't over heated. I can get it to leak if it is up on my hoist and a helper is in the car giving it a little gas. There is a new contact plate in it so there is a new float valve with it. The car is a 2003. Jerry

104,205

So if it does it even when cold then it sounds like the rebuilder may have forgot a baffle plate inside the tranny.

1 of 1 people found this helpful.
10

The transmission is a 722.6. No baffles inside any of those I have done. I filled it up to the proper level using the Mercedes dipstick and when I started it up it blew some oil out of the dipstick tube. Cap wasn't on it at that time. I never had oil come out of that tube before on any of them I have worked on. I put the cap on and ran it for less than a minute and had a mirror where I could see the vent and it started bubbling oil out the breather vent.

104,205

Every time I have ran up against a tranny that is blowing fluid out of either the dipstick tube of the vent there has been something wrong internally if the cooler was in good shape. Even had one customer that caught his car on fire due to the same problem.

1 of 1 people found this helpful.
10

Could it be that not enough endplay would be causing the problem?

104,205

That usually makes more heat due to more friction, but you said that it didn't get hot so now I have no idea.

1 of 1 people found this helpful.
10

I think there must be a hot spot in there that is boiling the fluid and creating a vapor. It may be too much pressure on a thrust bearing. I am thinking strongly about pulling it down and checking all those bearings and look for signs of over heating.

10

All OK now. Turned out it was the torque converter. It must have been full of trash as I cut open the last filter I had put in it and it was full of junk. It had only about 20 miles on it. I knew the tranny was clean so that left the converter. No more oil flying out the breather. Thanks for the suggestions. Jerry

1 of 1 people found this helpful.
104,205

WOW was it not flushed during the overhaul?

1 of 1 people found this helpful.
10

It had new oil about three or four times but I think it was the rust coming lose from the converter. Jerry

104,205

Are you going to trust it?

10

Well have put a couple hundred miles on it and no problems so looks like the converter was the problem. Keeping my fingers crossed,:))) Thanks for the help. Jerry

Your Answer

E-Class

Looking for a Used E-Class in your area?

CarGurus has 22,086 nationwide E-Class listings starting at $1,500.

ZIP:

Mercedes-Benz E-Class Experts

  • #1
    Tom Demyan
    Reputation
    2,250
  • #2
    dandyoun
    Reputation
    2,020
  • #3
    bobkat
    Reputation
    1,480
View All

Related Models For Sale

Used Mercedes-Benz C-Class
766 Great Deals out of 29,305 listings starting at $1,500
Used Mercedes-Benz S-Class
160 Great Deals out of 7,651 listings starting at $2,000
Used BMW 5 Series
500 Great Deals out of 15,829 listings starting at $1,500
Used BMW 3 Series
1,081 Great Deals out of 33,881 listings starting at $1,000
Used Mercedes-Benz M-Class
297 Great Deals out of 6,254 listings starting at $1,950
Used BMW 7 Series
102 Great Deals out of 5,270 listings starting at $2,999
Used Mercedes-Benz SL-Class
65 Great Deals out of 3,435 listings starting at $7,000
Used Audi A6
138 Great Deals out of 7,442 listings starting at $1,595
Used BMW 6 Series
82 Great Deals out of 2,498 listings starting at $5,950
Used Mercedes-Benz G-Class
11 Great Deals out of 845 listings starting at $21,995
Used Mercedes-Benz CLK-Class
33 Great Deals out of 1,168 listings starting at $1,500
Used Mercedes-Benz CL-Class
18 Great Deals out of 515 listings starting at $4,580

Used Cars For Sale

2018 Mercedes-Benz E-Class For Sale
6,128 listings starting at $51,194
2017 Mercedes-Benz E-Class For Sale
72 Great Deals out of 3,358 listings starting at $37,350
2016 Mercedes-Benz E-Class For Sale
82 Great Deals out of 1,373 listings starting at $24,890
2015 Mercedes-Benz E-Class For Sale
126 Great Deals out of 2,038 listings starting at $18,999
2014 Mercedes-Benz E-Class For Sale
144 Great Deals out of 2,651 listings starting at $17,994

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.