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  #1  
Old 05-25-2010, 05:59 PM
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Transmission dead 2001 C240

One of my Soldiers owns a 2001 c240, 6cyl gas with an automatic transmission, around 150,000 miles. I have a mechanics background but do not have any experience with Mercedes. I am thinking it is something electrical, with the vehicle is running and the selector moved to any position there is no change in engine RPM's (no engagement). The battery is good (starts but not tested) fluid is full and does not smell burnt. Unfortunately he still owes a considerable amount and does not have additional funds for a large repair or repair shop. So hopefully some of you can offer some suggestions as to getting this vehicle back on the road. Thank You

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  #2  
Old 05-26-2010, 08:10 AM
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Any warning lights?? like "check engine"?

No movement at all suggests low fluid level OR complete mechanical failure of the trans.
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  #3  
Old 05-26-2010, 12:15 PM
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Does the gear indicator change when shifted out of parK? Did the shift linkage fall off?
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  #4  
Old 05-26-2010, 08:32 PM
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The linkage is still connected, but I have some more information around 1 month ago he had the fluid changed at the dealer, a short time later the vehicle would not shift out of 1st. The engine light came on and autozone or advance told him it was a speed sensor problem. The dealer stated it did not have this sensor and sold him an electronics package and 3 quarts of fluid. My Soldier removed the pan, removed whatever sensor he was sold (he destroyed the old one taking it out) and added 3 quarts of fluid. (is it true there is no dip stick?) now the car does nothing. Do I need to go in and pull the pan to check the sensor? could this sensor cause this problem (improperly installed, broken wire, not seated ETC). Thank You for the previous reply's.
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Old 06-02-2010, 05:43 PM
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Does anyone have any sugestions about this transmission?
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  #6  
Old 06-03-2010, 12:24 PM
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Quote:
Originally Posted by 1bbm View Post
could this sensor cause this problem (improperly installed, broken wire, not seated ETC).
If the problem began after the work was done it would make sense to re-check the previous repair. You say he "destroyed" the old one taking it out? That could be cause for concern.
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  #7  
Old 06-03-2010, 05:01 PM
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Previous repair was initially a fluid change, it completly went out after he changed the sensor, however he was having problems (would not shift out of 1st) before he changed the electronics. The sensor was broken as it came out (his words it was destroyed after further questioning it came out broken), it was also thrown away. my previous experiance with some vehicles is if the fluid and filter was never changed until 150k the transmission would work for a month and then quit (new fluid would break the gunk down and the transmission would just quit working all together) is this also a problem with high milage mercedes or could the electronics he replaced have been effected by sludge, ruff handeling Ect. after/ during the fluid change. I have not been able to look at the vehicle yet, is it true this vehicle does not have a dipstick? Thank You in advance
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  #8  
Old 06-03-2010, 06:16 PM
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Couple of things:

- No fluid change for 150K miles is not a death sentence. MB initially did not recommend any service for the life of the transmission. Later this was changed to a single service at 40K miles because the gearchanges would become a bit rough. I would not assume the fluid change caused the problem.

- The transmission uses specific fluid. It can be had from the dealer or specialist vendors (e.g. this site). Although it is similar to Dexron, you cannot use common over-the-counter fluids in this transmission.

- The transmission is sensitive to fluid level - aren't they all.

- The transmission dipstick is a service tool, it is not included with the car. The car itself has a more-or-less standard tube and cap, in more or less the usual location, for checking the fluid. Just that there is no trans dipstick attached to the cap. The cap has a replaceable locking clip which is destroyed in the process of removing the cap. This exists to prevent people from adding incorrect transmission fluid types.

- You can buy the trans dipstick here, or make your own. At either this site, or perhaps over at mbworld.org, you can search up a thread on how to make a transmission dipstick at home. Google is your friend here.

- Fluid level is supposed to be set with fluid temperature at 80C. If you fill the trans cold, it will be overfull.

- Given the symptoms, I'd be checking the trans fluid level before anything. If it's low, I'd be looking for where he poured in the 3 liters of fluid...
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  #9  
Old 06-04-2010, 12:27 PM
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jcyuhn Thank You for the great reply, when the pan is drained and dropped is the approximate fluid replacement 3 quarts/ liters? I spoke to the dealership Tech here and he said he adds 4 and goes from there. When I told him his shop sold the parts and 3 quarts he said I would add another ½ quart and see what happens.
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  #10  
Old 06-04-2010, 12:58 PM
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I don't know how many liters are expected when replacing the pan. In the range of 3-4 sounds right, as about 8 liters is typical for the entire transmission, and half that is in the torque converter.

Half a liter isn't going to make the difference between moving and not moving. You really need to check the fluid level in the pan - at least make sure there is _something_ in there. Note the clutches in this trans use graphite, so the fluid turns dark as they wear. Probably inky black on a 150K mile car. This is just normal wear, so don't be too alarmed if the fluid is not all pink and happy looking.

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