Oil comes out of breather on top of tranny

Asked by Nov 30, 2016 at 10:01 PM about the 2003 Mercedes-Benz E-Class E500

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.

8 Answers

77,825

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 out of 1 people think this is helpful.

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

77,825

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

1 out of 1 people think this is helpful.

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.

77,825

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 out of 1 people think this is helpful.

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

77,825

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 out of 1 people think this is helpful.

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.

Your Answer

Add photo

Related Questions

E-Class

Looking for a Used E-Class in your area?

CarGurus has 22,862 nationwide E-Class listings starting at $1,500.

ZIP:

Search Mercedes-Benz E-Class Questions

Mercedes-Benz E-Class Experts

#1 Tom Demyan
Tom Demyan
Reputation 1,780
#2 dandyoun
dandyoun
Reputation 1,740
#3 bobkat
bobkat
Reputation 1,240
View All

Related Models For Sale

Used Mercedes-Benz C-Class
931 Great Deals out of 32,459 listings starting at $2,497
Used Mercedes-Benz S-Class
159 Great Deals out of 5,942 listings starting at $2,500
Used BMW 5 Series
643 Great Deals out of 17,675 listings starting at $1,500
Used BMW 3 Series
1,781 Great Deals out of 40,585 listings starting at $1,350
Used Mercedes-Benz M-Class
271 Great Deals out of 5,677 listings starting at $2,500
Used BMW 7 Series
189 Great Deals out of 5,841 listings starting at $3,599
Used Mercedes-Benz SL-Class
106 Great Deals out of 3,390 listings starting at $1,500
Used Audi A6
160 Great Deals out of 7,312 listings starting at $2,000
Used Mercedes-Benz CL-Class
22 Great Deals out of 617 listings starting at $4,786
Used Mercedes-Benz CLK-Class
61 Great Deals out of 1,465 listings starting at $2,990
Used BMW 6 Series
110 Great Deals out of 3,191 listings starting at $7,495
Used BMW X5
571 Great Deals out of 16,652 listings starting at $2,788

Used Cars For Sale

2017 Mercedes-Benz E-Class For Sale
6 Great Deals out of 8,578 listings starting at $47,998
2016 Mercedes-Benz E-Class For Sale
61 Great Deals out of 1,760 listings starting at $32,999
2015 Mercedes-Benz E-Class For Sale
11 Great Deals out of 450 listings starting at $28,999
2014 Mercedes-Benz E-Class For Sale
220 Great Deals out of 4,556 listings starting at $19,900
2013 Mercedes-Benz E-Class For Sale
47 Great Deals out of 789 listings starting at $17,999