totsubo

I did my wife's C300 W204 using these instructions. GREAT JOB on them!

The W203 and W204 are very similar, but not 100% the same. The part I got hung up on was locating the torque converter drain plug location. I finally found it by accident and almost pulled out the wrong bolt.

Also, I bought the Mercedes 722.9 Drive Line Filler Adapter from Tool Source. The pipe was rusted out on the inside of the tube. I used a .22 bore snake to clean it out. Be careful guys.

cxesar

why do u need 12 liters of ATF i asked at my local MB dealership and they only quoted 6 liters? newbie question?

totsubo

It did not take 12 Liters, but 10 for me.

You pretty much have to replace what you take out, plus 1 Liter.

I took out 9 Liters. I added 1 Liter.

6 Liters is too little. Perhaps your tech was only draining the oil from the pan and not the torque converter. I took out 4 Liters from the torque converter and another 5 Liters from the pan.

W203E35

Did you guys run into any trouble with the pressure release valve? We were filming the steps and while pumping we hit the valve and oil started coming out from the top. In panic (we didn't know what had happened) the camera guy dropped his camera in one of the used oil pans. We then started the car for couple of seconds and started pumping again.

totsubo

If you are talking about when pumping the fluid into the transmission, then no. I had no issues other than the pump I had on hand was dirty, so I had to use a hand pump, which took me 20 minutes.

cxesar

i thought when u drain the oil from the pan that would include the torque converter as well, i guess i was mistaken.... is it really needed to drain the torque converter since the dealer only quoted 6 bottles of fluid for the 40k mile tranny service? maybe draining the torque converter is done at a later service...by the way mine is not a 4matic if that makes any difference..thanks the info totsubo

totsubo

My wife's is not a 4matic either.

You should always replace as much of the old fluid as possible. The torque converter hold almost half the ATF134 fluid.

Glyn M Ruck

Carsy

With my 5 speed without TC drain plug, by leaving it draining overnight ( total 18 hours) I removed an extra 1.5 litres compared with the initial drain period of say about an hour.

So if you are not flushing it is well worth the wait.

I was advised not to flush the unit if the oil was in good condition.

91RS

What is the point of bringing the transmission fluid up to 90*C and then back down to 45*C? I'm trying to check the fluid level on a SL500 after replacing the rear main seal on the engine and I guess I read the directions wrong and pulled the plug at 90*C and lost probably 1/2 quart of fluid. It looks like it already has the updated pan.

johnand

I don't recall any of the instructions instructing to bring the fluid up to 90°C then down to 45°C. Which document are you referring to? If you pulled the plug at 90°C, your fluid level will be way too low. Fill up with ~1L, then try again at 45°C.

91RS

It says bring to 90*C with additional transmission cooler then turn off and bring to 45*C. I guess I misunderstood what they mean by an additional transmission cooler. I didn't really loose that much fluid though, I probably only lost a few ounces when pulling the transmission out (even after removing the cooler lines) and maybe a 1/2 quart pulling the plug at the wrong temperature. The temperature didn't cool down enough by the time I left today, so I'll try again in the morning to get it right. Is it necessary to add the extra fluid before getting the fluid up to temperature though? Whenever I do the newer Corvettes/Camaros, which have a very similar setup, I usually add the last little bit after getting the fluid up to temperature and with the car running.

jim628

Hello:

I am still investigating the procedure to change the transmission fluid and this posting is very useful, thanks. However I have the following question:
In step 6 of the oil removal procedure, it says "Drain automatic transmission fluid from torque converter", this is in addition to draining the transmission fluid from the oil pan.

The part that I don't understand is, when refilling the transmission with the new oil, I did not see the procedure to refill the fluid for the torque converter. Looking at the 7G transmission picture/diagram, the torque converter is a seperate unit than the transmission itself. SO my question is how does the new transmission fluid get into the torque converter after the transmission is refilled with the new fluid? Am I wrong to assume the torque converter is a seperate unit? Sorry I am not an automatic transmission expert.

Thanks
Jimmy

Glyn M Ruck

The TC fills from the main transmission sump. The TC is not separate from the transmission. Fluid is constantly circulated through the TC to cool it.

So you drain the TC to get 4 litres of fluid out of it but you only fill from below the pan. The transmission oil pump will refill the TC.

hawknight

Thanks very much for the information. I wonder if there is any instructions on the transfer case fluid change for 4Matic transmission?

johnand

You are welcome. The search button is your friend: https://mbworld.org/forums/c-class-w...matic-pcy.html

Glyn M Ruck

Should others search & find this thread - It should be noted that the latest versions of the 722.9 as fitted to W204 etc have the transfer case integral with the transmission.

hawknight

Exactly. Since I have an X204 4Matic which integrates transfer case with 722.9 transmission. My question is
Will the procedure similar to what posted above to change transfer case fluid in 204? Appreciate a lot if there is an instruction.

Glyn M Ruck

The integrated transfer case is lubricated by the ATF.

SkankZ

Does anyone have the link to the document Glyn posted saying the transmission should be reservice every 39,000 miles?

I'm doing a presentation for my engineering class about Mercedes and trying to put up a PPT together with the service, maintenance, manufacturer defects, common problems.

Any information will be of great use! Thanks

hawknight

Agree that the transfer case is integral in 204. I have chassis whine noise starting 40 mph in my X204. Dealer located the noise and pointed to noisy transfer case. They performed the transfer case oil change using 3 qts. ATF. Does this mean that they just drained out the ATF from pan and then pump in new oil, right?

It seems like what dealer has done is the first part of the 722.9 transmission fluid change before pan dropping and TC drain. In other word, the complete transmission DIY process posted here will take care of the transfer case oil without separate, additional work for transfer case?

MooflesThaCat

quick question. Is changing the ATF part of any of the MB Services? I ask because I purchased my 06 230 with 65k and do not know if it has been done already. It has all the factory scheduled services done up to that date.. just wondering if this would be part of it.

samaritrey

I doubt it has been done and I would have it done very soon

johnand

+1. Not worth chancing on the 7G.

kikev

hello can you post the part numbers and were do you order the parts from?
i`m due for the change on 60500 km so i will trie this on my own dealer quoted 700 dlls
thanks!