It's official: I screwed my c270cdi gearbox

[fjmrf]

Hi everyone.
Well, it is true... I just screwed the gearbox and I need help:
The case: my gearbox, after get in the right temperature, was getting in limb/safe mode when you press the gas hard... Sometimes even slipping to neutral.
So I checked in a mb scanner and it was a sensor in sensor plate, but the mechanic told me that "could" be only the fluid (it was yellow, old, car with 96k)... Trying to economise a few bucks (stupid decision) I decided to change the oil by myself...
I've a got knowledge about cars (already assembled few engines, I put a turbo in my car by myself, etc) but no knowledge about automatic gearbox...
I read some forums and decided to do... After all, "how hard can it be?"...
It drains only 2 litres by the drain screw. So I decieded to buy the original oil (6 litres) and do 3 changes, knowing that part of the oil would be the old but it could solve the problem.
First time ok, second time I got the "brilliant" idea of turn the car on for a second to take a bit more oil out... Worked, 3 litres... I bought another litre. The car was "ok" until now but with the slip gear problem...
In the third time I did as the second one, this time only 2 litres...
The car has keeped slipping the gears but now with a small repetitive noise when rolling (not from engine, noise change with speed, not rpm)... I was think in wheal bearing...
Today I was going out and the car was completely without power when starts... You accelerate and it almost don't move... Almost 1 minute after turned on it started to work well, but when I put the car in the road the noise was really ugly (how faster it goes more noise it does)...

Well, that is the case in bad English (sorry, I'm a Portuguese speaker living in London)... The money is short and I know that I will need to take to the garage to fix it (or someone want want to buy a 2001 c270cdi in great shape but with a big problem in the gearbox????)
I believe that will be better buy a new gearbox and put it on place... And here are 2 questions:
1st: I know that the 722.6 gearboxes have different ending numbers depending of car model. Anyone knows what one works with my car? (e.g.: will a c220cdi gearbox works in my car?)
2nd: anyone has this gearbox to sell me or know someone / someplace where I can buy (cheap, please!!!!)?

:fail

Thanks

 

[WG M-B]

So if you drained it out and refilled with the same amound you have done nothing wrong
You did pour the fresh oil in the tube with the black cap and not the red cap didnt you? the red cap is engine oil, not red fluid

 

[Benza750]

Sounds like you need to get it somebody that can do the oil change properly for you & check the level afterward.
If There's not enough oil it will slip & have no drive.

 

[rorf]

If only 2 litres came out of the sump then you were running low on transmission fluid in the first place.

They hold 8 litres plus; about 3.5 litres in the torque converter with balance in transmission and circuit pipes.

Do a search on how to check the level.

 

[fjmrf]

Solved... The "lion" problem was a chance "cat"....

Hi everyone... Thanks for the replay. I've been in the garage today. Good news and bad news:
Good news:
I did the change right (considering that I didn't open the gearbox it is around 2-3 litres only) and my change didn't screwed.
The noise was the parking brake cable that was touching the drive shaft... A support broke and it fall over... Probably by chance it brakes at same time that I was servicing the gearbox... That's why the noise was only inside, the cable was vibrating and the sound was loud only inside...
The lack of power was probably due to air in the system because I make the system work without oil for few seconds (not enought to break or damage but enought to put air in the system). Today worked 100%.
Bad news:
The problem of my car IS the sensor plate... ( not so bad if considering the previous panorama). But it is only this...
I've learned a lot today, expended 50 bucks with the garage to elevate the car properly and solving this minor issues but in the end is everything ok... I fell 20 pounds light!!!

Thanks all for the replay.

 

[Lorro]

Contact Prestige Allparts Independant Mercedes Specialists in Oldham, Manchester. The have a huge supply/ stock of Merc parts and can fit them also if you need it. A good second hand automatic gearbox from them will cost you about 270pounds, had a similar experience a while ago and they sorted me out. They contact info is on the Internet, best of luck

 

[fjmrf]

Good to know Lorro. Thanks for the hint! I'll use as soon as needed.

 

[proser]

Replacing the sensor plate is not a big job, but the bolts that hold the pan in place can shear.
Also best to replace gearbox filter and gasket at the same time.

Done mine sometime back and one bolt sheared, but had the tools to drill out and re-tap ready for new bolt.