7G tronic 722.9 trans refill questions
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Member
Joined: Apr 2016
Posts: 172
Likes: 45
From: Houston, TX
2017 S550 coupe, 2013 E550 coupe, 2008 Tahoe
7G tronic 722.9 trans refill questions
Had a few questions on refilling trans fluid for 722.9 with torque converter drained. I got 9.5 liters out of pan and TC. Dropped valve body, cleaned solenoid contacts and selector arm magnet. Getting everything back together with new VB bolts, VB o-rings, TC drain plug (w/ captured washer) and pan drain plug washer that are not provided in the service kits from what I have seen. Should I refill 10 liters before starting engine or less? Is the torque converter ok to run without fluid for a few seconds until trans pump refills it?
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Joined: Apr 2011
Posts: 171
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From: Denver
2005 ML500, 2011 E350 4M, 2012 GL550
If you already drained a total of 9.5 liters, definitely start with 10, when I did mine, I drained a total of 8 liters from pan and torque convertor but did not take the valve body out, looks like you went in to more depth to clean it better.
I also started with 10 liters. I checked and checked and checked all over the place, videos I watched some people filled with 6.5 liters and started, some people started with 8
I just dont like the idea of running it dry even for a few seconds, so I initially filled it with 10 liters then started the engine.
I also started with 10 liters. I checked and checked and checked all over the place, videos I watched some people filled with 6.5 liters and started, some people started with 8
I just dont like the idea of running it dry even for a few seconds, so I initially filled it with 10 liters then started the engine.
Joined: Nov 2016
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From: Maryland
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
I concur. Whatever you take out, put back in. Those adding only 6.5 liters probably only took out that much. Remember, measure as directed and at the correct temperature.
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From: V E G A S
1922 Ford Model T / no OBD
I found precise measuring what I drain the easiest method. That helps even with motor oil, as having too many vehicles, I don't remember their capacity.
With 7G I refill about a cup above what I measured draining, giving for pan wiping.
Than after I make longer trip, I pull the plug to drain the excess.
Having monitoring scanner, the transmission takes pretty long drive to come to 80C.
With 7G I refill about a cup above what I measured draining, giving for pan wiping.
Than after I make longer trip, I pull the plug to drain the excess.
Having monitoring scanner, the transmission takes pretty long drive to come to 80C.
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Joined: Apr 2016
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From: Houston, TX
2017 S550 coupe, 2013 E550 coupe, 2008 Tahoe
Im still in the process. I will update. Most people don’t drop valve body and clean it. Hell most people barely service anything judging on general condition of used cars.
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MBWorld Fanatic!
Joined: Jan 2009
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From: V E G A S
1922 Ford Model T / no OBD
I removed valve body couple of times and the flat spots do hold some clutch dust, but considering the difficulty, I choose not to worry about it most of the time. Than 5G did have "lifetime fluid", what only changed to single service on 7G and only 7G+ require frequent service.
There is no way you will flush 100% of old ATF and dirt no matter what, so you choose between 90% flush with converter drain, or 75% of flush by dropping the pan only.
Dealers don't drain converters, when lot of cheap service will just pull the plug, what will give about 33% of flush, still leaving semi-solid dirt in the pan.
