Question: Drain ATF from Torque Converter vs Transmission Oil Pan
Thread Starter
Super Member
Joined: May 2014
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From: Vancouver B.C. Canada
2014 E550 4MATIC TUNED - Turbo Upgraded Stage 3
Question: Drain ATF from Torque Converter vs Transmission Oil Pan
This will be my first time doing Transmission oil change on my E by myself. (Before i let dealer do it)
Most people drain ATF from Transmission oil pan.
But I have seen some people draining ATF from Torque converter.
If i only drain ATF from tranny oil pan, will ATF in torque converter also get drained ?
I would love to learn what is the differences drainning ATF from torque converter and tranny oil pan.
All educational answers are greatly appreciate it!!!!!!!
Most people drain ATF from Transmission oil pan.
But I have seen some people draining ATF from Torque converter.
If i only drain ATF from tranny oil pan, will ATF in torque converter also get drained ?
I would love to learn what is the differences drainning ATF from torque converter and tranny oil pan.
All educational answers are greatly appreciate it!!!!!!!
Newbie
Joined: Aug 2018
Posts: 10
Likes: 3
From: Denver, CO
E350TE, 400E
Draining the pan will not drain the torque converter and draining the torque converter will not drain the pan. Normal MB servicing drains both. The transmission actually pumps oil into the torque converter.
Stu
Stu
Thread Starter
Super Member
Joined: May 2014
Posts: 818
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From: Vancouver B.C. Canada
2014 E550 4MATIC TUNED - Turbo Upgraded Stage 3
As you said Tranny actually pumps oil into TQ conveter, So, that means only need to fill up ATF from Tranny oil pan fill hole, correct ?
Member
Joined: Feb 2016
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From: Palatine, IL
2013 E350 4Matic
so, ATF has to be drained from both Torque converter and Tranny oil pan.
As you said Tranny actually pumps oil into TQ conveter, So, that means only need to fill up ATF from Tranny oil pan fill hole, correct ?
As you said Tranny actually pumps oil into TQ conveter, So, that means only need to fill up ATF from Tranny oil pan fill hole, correct ?
Last edited by s140s; Jun 7, 2019 at 06:58 PM.
Thread Starter
Super Member
Joined: May 2014
Posts: 818
Likes: 79
From: Vancouver B.C. Canada
2014 E550 4MATIC TUNED - Turbo Upgraded Stage 3
When you refill the pan, ATF will be pumped into the torque converter, there is no pan fill hole, it needs to be pumped via the drain hole. Basically you should measure how much is drained, refill with .5 to 1 qt more than drained, start the car and monitor ATF temperature until it reaches 35-45C, then you remove the drain bolt and extra ATF will drain through overflow tube. When it starts dripping, you reinstall drain plug and call it a day. All this is supposed to be done with engine running and vehicle leveled.
All this needs to be done while engine is running, Do I put it in N ? or P ?
Thanks!!
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2013 E350 4Matic
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Member
Joined: Sep 2022
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2010 e550 coupe
Engine on is for correcting fluid level, you add about 9 liters of fluid, go through all the gears, then wait for fluid to reach temperature. Once it reaches the temp, with the Engine on and trans in Park, remove the drain plug/plug fill adapter and let excess fluid drain. Reinstall the drain plug and its done. Here is a more detailed tutorial.
https://www.benzworld.org/forums/w21...7g-tronic.html
https://www.benzworld.org/forums/w21...7g-tronic.html
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From: Jakarta-Indonesia
2014 - W212.065 - E400 ( M276.820, 3 liter Turbo) RWD not Hybrid
The initial 4-5 liters as first step before final top up, I am guessing is not to over filled the tranny oil pan....where the torque converter was still empty when it got drained.
TQ itself takes approx 3.5 liters. So in theory the oil pan will hold maybe 5.5 to 6 liters max and TQ at stand by has 3.5 liters.
It takes approx 9.5 liters on my tranny with AUX oil pump, for ECO S/S version.
TQ itself takes approx 3.5 liters. So in theory the oil pan will hold maybe 5.5 to 6 liters max and TQ at stand by has 3.5 liters.
It takes approx 9.5 liters on my tranny with AUX oil pump, for ECO S/S version.
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Posts: 113
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2010 e550 coupe
The initial 4-5 liters as first step before final top up, I am guessing is not to over filled the tranny oil pan....where the torque converter was still empty when it got drained.
TQ itself takes approx 3.5 liters. So in theory the oil pan will hold maybe 5.5 to 6 liters max and TQ at stand by has 3.5 liters.
It takes approx 9.5 liters on my tranny with AUX oil pump, for ECO S/S version.
TQ itself takes approx 3.5 liters. So in theory the oil pan will hold maybe 5.5 to 6 liters max and TQ at stand by has 3.5 liters.
It takes approx 9.5 liters on my tranny with AUX oil pump, for ECO S/S version.
MBWorld Fanatic!
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Posts: 6,600
Likes: 6,547
From: Jakarta-Indonesia
2014 - W212.065 - E400 ( M276.820, 3 liter Turbo) RWD not Hybrid
I believe the moment the engine is started and therefore tranny starts to spin , the torque converter automatically gets oil into it.
The gear changes procedures would be more for small oil galleries where the solenoids are the one controlling it, to be properly filled with oil.
Gear change in our 722.x tranny is done by hydraulic command/actuation, oil pressure and volume based, hence solenoids are the one doing it
The gear changes procedures would be more for small oil galleries where the solenoids are the one controlling it, to be properly filled with oil.
Gear change in our 722.x tranny is done by hydraulic command/actuation, oil pressure and volume based, hence solenoids are the one doing it
Member
Joined: Sep 2022
Posts: 113
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2010 e550 coupe
I believe the moment the engine is started and therefore tranny starts to spin , the torque converter automatically gets oil into it.
The gear changes procedures would be more for small oil galleries where the solenoids are the one controlling it, to be properly filled with oil.
Gear change in our 722.x tranny is done by hydraulic command/actuation, oil pressure and volume based, hence solenoids are the one doing it
The gear changes procedures would be more for small oil galleries where the solenoids are the one controlling it, to be properly filled with oil.
Gear change in our 722.x tranny is done by hydraulic command/actuation, oil pressure and volume based, hence solenoids are the one doing it
MBWorld Fanatic!
Joined: May 2018
Posts: 6,600
Likes: 6,547
From: Jakarta-Indonesia
2014 - W212.065 - E400 ( M276.820, 3 liter Turbo) RWD not Hybrid
When a torque converter is not new, aka has been installed on a car, its lock up clutch is already wet and draining it won't be as dry as a virgin
brand new TC from the store. So you need not worry...it is sort of pre-lubed already.
Also a TC is a fluid coupling, no oil in it.....it wont spin. So it is safe.
TC internal Lock up clutch wont be engaged anyway during engine start-up.
brand new TC from the store. So you need not worry...it is sort of pre-lubed already.
Also a TC is a fluid coupling, no oil in it.....it wont spin. So it is safe.
TC internal Lock up clutch wont be engaged anyway during engine start-up.
