awbooth

2005 M.Benz C240 4Matic, howdo you drain the transmission converter fluid?
I'm changing the fluid next week and I heard that if you just drop the pan you will still have old tranny fluid in converter. How do you drain the converter? Thanks
Ant

Glyn M Ruck

https://mbworld.org/forums/attachmen...0flush1-1-.pdf

https://mbworld.org/forums/attachmen...0flush2-1-.pdf

a91brunello

My better half has just become the proud owner of a 2005 C240 4-Matic wagon (110,000 miles). I've read the threads on how to flush the trans and was set to do it but the service people said it's recommended to change oil but not flush unless it had been flushed regularly because it will cause problems from disturbed particles pugging valves, etc. Any advice?

samaritrey

https://mbworld.org/forums/c-class-w...n-related.html
The 2nd post has instructions that many of us including myself have used that make flushing the system so easy. I would personally do a full flush but that is up to you. At the minimum drop the pan and change the filter. Also you can find the approved fluid much cheaper than the dealer many of us on here use Shell 134 which you can find for under $10 a quart and if you can find a local shell supplier that has it you can get it for around $5.
I did my first pan drop around 100k or so then another pan drop around 135k i believe then a flush around 171k. I now have around 204k and it is doing just fine but is due very soon for another flush. If you keep the 722.6 transmission happy they will go a very long time.

jkowtko

My feeling is that this advice is misleading, and is likely directed at flushing techniques that involve pressurizing the fluid in a different manner than normal operating conditions create.

The flushing method used for our cars involves letting the transmission fluid pump push the old fluid out of a tapped cooling line, while you pour new fluid back in through the regular fill tube. There is nothing inherantly different about how the fluid is flowing trough the transmission in this case.

Unless their argument is that clean fluid will dislodge more residue in a tranny than old dirty fluid, therefore you should leave dirty fluid in the transmission ... ?

If you want to play it safe, then do a pan drop and filter change first (6 qts), wait a few months, then do another drain and fill without dropping the pan (4 qts). This will put you at maybe 1/2 to 2/3 fresh fluid in the tranny. Wait a year and then do the full flush.

Carsy

Good plan.

I calculated that 73% of fluid is drained in a pan drop & filter change & 62 % if just draining so a very good proportion will be new oil.( 89%). (These figures for pans that are left draining overnight.)

One good theory by experts is that there is no need to flush if the fluid is in good clean condition & is not burnt. Continual 60,000 km pan drop & filter change will do the job.

Javvy

glyn...in the second attachement above....what is the part number of the (4) Connector....that is connected to the banjo bolt......Is this a mercedes tool or something else...where can I get this.....please can some one clarify as I waht to do a complete drain, replace gasket/filter tranny fluid change....

Javvy

jkowtko

My advice ... open up the cooling line at the top of the radiator ... don't mess with the banjo bolt.

My first thought was to break at the banjo bolt, but looking around in vain for a fitting, then realizing all I had to do was blow air through the remaining cooling line to push the old fluid into the tranny sump, it seemed fruitless to use the banjo bolt method.

If you open up at the fitting at the top of the radiator, you can install a new O-ring there and be good to go. It's also much easier to flush from that position. Get 1/2" ID plastic tubing and a hose clamp.

Glyn M Ruck

I don't know the PN. If I remember correctly that adaptor is part of the fuel injection/diesel injection adaptor kit that you can get from Baum tools or Benz. The cost is not worth it.

Javvy

I guess then I will follow the rad top o-ring method...

Javvy

BigN8

Is the harness connector an issue on all of the 722.6 transmissions?