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  #1  
Old 03-05-2017, 07:53 PM
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Join Date: Apr 2012
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Smoking, burning, leaking oil behind and under the rear motor issues with pictures

As previously mentioned on my earlier posts regarding the oil burning/smelling/smoking and leaking under the rear bottom of the motor, here is the follow-up/update:

I put the Mercedes wagon on top the front two ramp giving me about 2 or so feet clearance while I was on the ground under the Mercedes. Got under the wagon and saw very clearly and not muddy or dirty transmission and the motor. No need to put in Gunk foam engine cleaner.

I then proceeded to put in the 1 oz oil dye in the oil crankcase. Start the motor and got off the ramps. I ran the motor for a few minutes then drove about 10 miles. Smoke was visible at the back of the Mercedes while driving as I saw the smoke coming out by looking through the rear view mirror. After driving and heading back home to put the Mercedes on the ramp, smoke was also visible under the passenger side door. Lift the hood, smoke (burning oil) was also visible underneath the rear motor near the EGR valve area.

Got the Mercedes back on the ramps again. Turned off the motor. Smelled burning oil and saw smoke near the EGR valve area. Smoke also visible under the passenger door side. I waited for about an hour to cool off the motor. I then go under the motor to see if any leaks showing through the dye using the yellow glasses and the LED flashlight. Here are the pictures of the results below:

Here are the first group of 21 pictures (1-5) below (finally got a camera) showing before and after cleaning up using a rag. (Hope the pictures are not that bad since I am new in this situation). The next 5 pictures are in order on the next thread and thereafter until all the remaining pictures are included in this post. I just wish there is an easier way to post all pictures in the same thread.

Because all of the pictures were line up in the attachments and I could not figure out how to separate the pictures group in between with additional information/comments. I came up with the following:

First 21 pictures refers to before and after cleaning up the motor/transmission area.

The last pictures group of 11 were after putting the oil dye and running/driving the Mercedes and using the LED flashlight (purple spots areas) showing afterwards the oil leakage area. Notice the smoke coming out from the inside the hood area near the egr valve location near the rear motor as well as smoke coming out under the passenger side door.

Oil puddle on the cardboard just underneath straight down from the outer edge of transmission bell on the left/passenger side facing me. Oil leak could be from the above the transmission bell area and dripped down under, causing the oil puddle? I really cannot pinpoint where exactly the oil leak is coming from. I am guessing the rear seal (broken,torn, cracked?) is the culpit that goes in between the transmission gear to the rear motor.in addition, the oil pan gasket seems to be ok and I don't think that is the issue. I am tempted to drive the Mercedes to a mechanic who can actually (hopefully) spot the exact location where the oil leaking is coming from and give me the correct/right diagnosis. Anybody out there have any clues? Comments/feedback is greatly appreciated.
Attached Thumbnails
Smoking, burning, leaking oil behind and under the rear motor issues with pictures-p1010048.jpg   Smoking, burning, leaking oil behind and under the rear motor issues with pictures-p1010049.jpg   Smoking, burning, leaking oil behind and under the rear motor issues with pictures-p1010050.jpg   Smoking, burning, leaking oil behind and under the rear motor issues with pictures-p1010051.jpg   Smoking, burning, leaking oil behind and under the rear motor issues with pictures-p1010052.jpg  

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  #2  
Old 03-05-2017, 07:59 PM
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Here are the next five pictures of the first group (6-10)
Attached Thumbnails
Smoking, burning, leaking oil behind and under the rear motor issues with pictures-p1010053.jpg   Smoking, burning, leaking oil behind and under the rear motor issues with pictures-p1010054.jpg   Smoking, burning, leaking oil behind and under the rear motor issues with pictures-p1010055.jpg   Smoking, burning, leaking oil behind and under the rear motor issues with pictures-p1010056.jpg   Smoking, burning, leaking oil behind and under the rear motor issues with pictures-p1010057.jpg  

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  #3  
Old 03-05-2017, 08:00 PM
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gaskets,and seals don't last for ever.I had my trans seal replaced,did my own rocker arm cover.If you have trans out do rear seal in engine too.
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  #4  
Old 03-05-2017, 08:04 PM
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The next 5 pictures of the first group (11-16)
Attached Thumbnails
Smoking, burning, leaking oil behind and under the rear motor issues with pictures-p1010058.jpg   Smoking, burning, leaking oil behind and under the rear motor issues with pictures-p1010059.jpg   Smoking, burning, leaking oil behind and under the rear motor issues with pictures-p1010060.jpg   Smoking, burning, leaking oil behind and under the rear motor issues with pictures-p1010061.jpg   Smoking, burning, leaking oil behind and under the rear motor issues with pictures-p1010062.jpg  

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  #5  
Old 03-05-2017, 08:12 PM
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sorry about the last pictures. It should have been read as (11-15, not 11-16). Here are the next five pictures of the first group (16-20)
Attached Thumbnails
Smoking, burning, leaking oil behind and under the rear motor issues with pictures-p1010063.jpg   Smoking, burning, leaking oil behind and under the rear motor issues with pictures-p1010064.jpg   Smoking, burning, leaking oil behind and under the rear motor issues with pictures-p1010065.jpg   Smoking, burning, leaking oil behind and under the rear motor issues with pictures-p1010066.jpg   Smoking, burning, leaking oil behind and under the rear motor issues with pictures-p1010068.jpg  

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  #6  
Old 03-05-2017, 08:15 PM
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Finally, here is the last picture of the first group of 21.
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Smoking, burning, leaking oil behind and under the rear motor issues with pictures-p1010069.jpg  
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  #7  
Old 03-05-2017, 08:21 PM
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Join Date: Apr 2012
Posts: 211
The last pictures group of 11 were after putting the oil dye and running/driving the Mercedes and using the LED flashlight (purple spots areas) showing afterwards the oil leakage area.
Attached Thumbnails
Smoking, burning, leaking oil behind and under the rear motor issues with pictures-p1010059_01.jpg   Smoking, burning, leaking oil behind and under the rear motor issues with pictures-p1010061_01.jpg   Smoking, burning, leaking oil behind and under the rear motor issues with pictures-p1010062_01.jpg   Smoking, burning, leaking oil behind and under the rear motor issues with pictures-p1010063_01.jpg   Smoking, burning, leaking oil behind and under the rear motor issues with pictures-p1010064_01.jpg  

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  #8  
Old 03-05-2017, 08:29 PM
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Join Date: Apr 2012
Posts: 211
Here are the last 5 pictures of the second group of 11 pictures. Must have miss one somewhere. Anyway, here is the recap of the first post for those who missed it.

As previously mentioned on my earlier posts regarding the oil burning/smelling/smoking and leaking under the rear bottom of the motor, here is the follow-up/update:

I put the Mercedes wagon on top the front two ramp giving me about 2 or so feet clearance while I was on the ground under the Mercedes. Got under the wagon and saw very clearly and not muddy or dirty transmission and the motor. No need to put in Gunk foam engine cleaner.


I then proceeded to put in the 1 oz oil dye in the oil crankcase. Start the motor and got off the ramps. I ran the motor for a few minutes then drove about 10 miles. Smoke was visible at the back of the Mercedes while driving as I saw the smoke coming out by looking through the rear view mirror. After driving and heading back home to put the Mercedes on the ramp, smoke was also visible under the passenger side door. Lift the hood, smoke (burning oil) was also visible underneath the rear motor near the EGR valve area.

Got the Mercedes back on the ramps again. Turned off the motor. Smelled burning oil and saw smoke near the EGR valve area. Smoke also visible under the passenger door side. I waited for about an hour to cool off the motor. I then go under the motor to see if any leaks showing through the dye using the yellow glasses and the LED flashlight. Here are the pictures of the results below:

Here are the first group of 21 pictures (1-5) below (finally got a camera) showing before and after cleaning up using a rag. (Hope the pictures are not that bad since I am new in this situation). The next 5 pictures are in order on the next thread and thereafter until all the remaining pictures are included in this post. I just wish there is an easier way to post all pictures in the same thread.

Because all of the pictures were line up in the attachments and I could not figure out how to separate the pictures group in between with additional information/comments. I came up with the following:

First 21 pictures refers to before and after cleaning up the motor/transmission area.

The last pictures group of 10 were after putting the oil dye and running/driving the Mercedes and using the LED flashlight (purple spots areas) showing afterwards the oil leakage area. Notice the smoke coming out from the inside the hood area near the egr valve location near the rear motor as well as smoke coming out under the passenger side door.

Oil puddle on the cardboard just underneath straight down from the outer edge of transmission bell on the left/passenger side facing me. Oil leak could be from the above the transmission bell area and dripped down under, causing the oil puddle? I really cannot pinpoint where exactly the oil leak is coming from. I am guessing the rear seal (broken,torn, cracked?) is the culpit that goes in between the transmission gear to the rear motor.in addition, the oil pan gasket seems to be ok and I don't think that is the issue. I am tempted to drive the Mercedes to a mechanic who can actually (hopefully) spot the exact location where the oil leaking is coming from and give me the correct/right diagnosis. Anybody out there have any clues? Comments/feedback is greatly appreciated.
Attached Thumbnails
Smoking, burning, leaking oil behind and under the rear motor issues with pictures-p1010065_01.jpg   Smoking, burning, leaking oil behind and under the rear motor issues with pictures-p1010066_01.jpg   Smoking, burning, leaking oil behind and under the rear motor issues with pictures-p1010067_01.jpg   Smoking, burning, leaking oil behind and under the rear motor issues with pictures-p1010068_01.jpg   Smoking, burning, leaking oil behind and under the rear motor issues with pictures-p1010069_01.jpg  

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  #9  
Old 03-06-2017, 07:18 AM
Hirnbeiss's Avatar
ich fahre, also bin ich
 
Join Date: Mar 2002
Location: South Florida
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The most common spot for leakage on the M104 is the Stirndeckel (upper timing cover). Oil leas there and gets blown back over the motor. It leaks right at the junction cylinder head to cylinder block. It looks to me like you have oil at this height, so get a mirror and light and inspect that seam closely.
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  #10  
Old 03-06-2017, 07:40 AM
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With that much oil it looks like it is being sprayed under pressure. There is a oil pressure passage in the back corner that supplies oil from the block to the head. This is a common problem with the M104 (and M103) engines although it is usually a slow leak.

Has the head gasket been changed and if so do you know at what mileage?
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  #11  
Old 03-06-2017, 09:30 AM
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Hirnbeiss. Thank you for your comments. I appreciated it. I found this post on the forum with the title "M104.992 / 95E320 Timing Cover Seal Replacement Steps and Pics"

M104.992 / 95E320 Timing Cover Seal Replacement Steps and Pics. Is that what you are referring to?
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  #12  
Old 03-06-2017, 09:41 AM
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Rick76, No, the head gasket had not been changed when I bought the Mercedes last year. The issue was still there when I bought the Mercedes. Previous owner claims the valve cover gasket needed to be replaced. When I removed the valve cover, oil was everywhere inside the valve cover. I replaced the valve cover gasket with new seals. I also had to replaced the front fuel injector facing me on the right side (driver's side) and oil was inside as well. The older fuel injector had broken o-ring seal. Will look into the timing cover seal area and check that out as well. Thanks for your comments.
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  #13  
Old 03-06-2017, 10:12 AM
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That is a LOT of oil! Is this more or less oil than before you changed the valve cover gasket? Putting it more bluntly - is the oil leaking worse now that you replaced the valve cover gasket?
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  #14  
Old 03-06-2017, 10:45 AM
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Diseasel300, thanks for your comments as well. I am pretty much sure that the oil leaking is worse now that I replaced the valve cover gasket.

I compiled a checklist of areas to be cover, just in case, to be send to a mechanic, if I decide to do this. Here is the checklist below:

My 1994 Mercedes E320 wagon needs to be diagnose and/or check out on the follow areas:

1. Smelling burning oil and smoke locations. 2 or more possible locations of smoke are by the EGR Valve area on the exhaust manifold near the back of the engine and underneath the Mercedes on both the driver's side and passenger's side, possible by the exhaust muffler and/or front end of tail pipe. Determine what and where the source is coming from and the exact locations of smelling burning oil and why. Does the EGR valve needs to be replace? What else needs to be done to correct the above issues?

2. Check for all oil leaks and location of oil leaks. If there are any oil leaks, what needs to be done to correct the problems? Check the oil pan gasket, head gasket, front cover timing seal gasket, and transmission gasket. Also, check the rear seal, if possible from the transmission bell to the rear motor for leaks.

3. Check the wiring of the oil sender unit sensor near the oil pan plug. See if wiring connections and connectors are tight and not loose inside the oil sender unit sensor. Check/ inspect the wiring for torn, cracked, exposed wires. Check the voltage on the oil sending unit sensor wire. Also, check if the oil sending unit sensor is defective or not. Oil sending unit warning lights on the instrument cluster panel kept going off and on when driving. If there any problems with the oil sender unit sensor issue, what needs to be done to fix the problems?. Does the oil sending unit sensor unit need to be replace?

4. Check the oil pressure unit sensor, its connecting wire for loose, frayed, exposed wiring connector. Check the voltage on the oil pressure unit connecting wire. It is located in the front of the oil filter housing near the master brake fluid reservoir. On the instrument cluster panel, the oil pressure guage keeps fluttering up and down. Does the oil pressure unit sensor need to be replace?

5. Check the oil pump to see if the oil pump is working ok.

6. Check transmission fluid level in the dipstick and leaks if any. Engine needs to be running to get accurate reading level on the transmission dipstick. If found to have a leak on the transmission fluid, what needs to be done to correct the issue? If no leaks are found and the transmission fluid level on the dipstick is low, how much extra transmission fluid needs to be fill until appropriate transmission fluid level on the dipstick is ok?

7. Check the transmission pan for leaks, stripped bolts, etc. and the transmission pan gasket. Does the transmission pan gasket and filter needs to be replace?

8. is the head gasket in good shape? Check for any signs of leaking oil on the head gasket area, especialy the rear end of the engine. Does the head gasket need to be replace?

9. Check the shifting gears for hesitation issues, especially the drive and reverse shifts. Very loud changing gear shifts. What is the issue, if any, and how can that be fix?

10. Check the fuel pressure regulator. Is the fuel pressure regulator ok or defective and needs to be replace?

11. Check the engine compression. Is the engine compression ok?

12. Check for vacuum leaks near the throttle body, intake manifold areas using a "smoker" through the vacuum lines to detect leaks and if so, should see smoke coming out of the vacuum lines. The Mercedes have high idling issues.

13. Take pictures using my camera of the oil leaks locations after finding the correct diagnosis as well as burning oil smell and smoke. In additon, take pictures of the vacuum leaks, if any,

14. Any other areas that needs to be check that are not in this checklist?

15. What would be the estimate total cost of diagnosis on the above issues?

16. What would be the estimate total cost including labor and parts, if needed, on the above issues that needs to be repair?

Comments, anyone?
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  #15  
Old 03-06-2017, 10:59 AM
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Good morning, have you considered taking the car to a shop and letting them diagnose this oil leak. There is something pouring oil on this engine and it shouldn't be to difficult to figure it out with the car on a lift.
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