722.9 stop start gearbox service

[Wenglish]

hi everyone I’m looking to get my 722.9 gearbox with stop start serviced it’s a 2011/2012 e350 and I’m being told conflicting information on what to do. Some say to get the torque converter drained and refilled while it’s being serviced and some say there is no drain plug to do so ? Is there anyway of using my VIN number to find out if I have the drain plug To do the converter ?

I’ve also contacted my local Mercedes Benz specialist today who have said they have never had a request to drain the torque converter and only ever just simply drain and refill the gearbox oil. So again am I getting it wrong with wanting the torque converter fluid replaced ?

A Mercedes dealership is advertising 2 different service kits for the 722.9 gearbox, 1 is a standard gearbox fluid service with filter etc the 2nd is more expensive and states it’s for the torque converter

So any help would be great please thank you

 

[markjay]

Dealers don't drain the torque converter when there's no drain plug.

You can still drain it, by disconnecting the hose going from the torque converter to the ATF cooler in the radiator.

The idea is to run the engine, collect the old ATF, while feeding the other hose with fresh ATF until the expelled ATF is clear.

There are video clips on YouTube showing how it's done.

Alternatively, some members on here just did two sump-only ATF change in succession, which considerably dilutes the old ATF.

 

[steveq]

Hi,

Your gearbox with stop/start will be the 7G+.
That almost certainly has a drain plug for the torque converter but you will have to remove the auxiliary pump to get at it. The pump is at the front of the gearbox under the torque converter. It is attached by 3 bolts and and electrical connector. Remove the pump and then turn the engine slowly using the crankshaft bolt until the drain bolt is at the bottom and visible through the hole.
To fully change the oil you will need 9 litres of 236.15 ATF -- that has a blue/green colour. Without draining the TC it will take 4-5 litres of the same spec.
In addition to the normal tools you will need an adaptor to to connect to a pump to get the ATF into the gearbox. You will also need a pump -- I have a Lidl one which was fine. You will also need a low range torque spanner to tighten the sump bolts.

The TC will hold about half the ATF -- hence the differing ATF quantities. Therefore changing the ATF without draining the TC only replaces half the ATF.
Yes, doing it a second time will replace half again -- but which half !!?? Also, the sump bolts are single use stretch bolts so will have to be replaced again as will the sump gasket and filter.

Draining the TC doesn't add much time to the job and at the end it is fully done so no need to go through the hassle a second time.

Note:- the previous spec ATF (236.14) was used in the 7G 'box which is red is not miscible with the 236.15 spec blue/green ATF for the 7G+.

 

[gianton]

Check this video here (at 1:50 it shows you where the TC drain plug is):

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[steveq]

That video shows the 7g rather than the 7g+.
That is what you would see when the auxiliary pump is removed.

 

[Wolfie1]

That video shows the 7g rather than the 7g+.
That is what you would see when the auxiliary pump is removed.

Is there a new gasket required for refitting the oil pump?

 

[steveq]

No gasket required.
The pump just mates to the gearbox with no gasket.
When you remove the pump, there are 2 small tubes 1 - 2 inches long that fit into the pump and up into the gearbox. The oil must flow through those. Make sure they are in place when refitting the pump.

Here is a picture of the side of the pump that mates to the gearbox. The tubes have a red plastic protective covers in this photo as it is a new pump.

 

[Jmr]

Merci super bravo ouce: