Change the transmission fluid in a 722.9 7G plus transmission (S550 4Matic - 2015)
#26
Yes I have two questions.
1: The 2 rear bolts on gearbox oil pan (marked blue) are not accessible from under. Maybe they can be removed with a small wrench, but how to install them again and torque them to 4 nm + 180 degree?
2. To drain the oil in the torque converter i believe that the start/stop oil pump (marked red) need to be remove to access the converter drain plug.
1: The 2 rear bolts on gearbox oil pan (marked blue) are not accessible from under. Maybe they can be removed with a small wrench, but how to install them again and torque them to 4 nm + 180 degree?
2. To drain the oil in the torque converter i believe that the start/stop oil pump (marked red) need to be remove to access the converter drain plug.
#27
Thread Starter
Junior Member
Joined: Dec 2018
Posts: 49
Likes: 20
From: Stockholm
Mercedes S 500 4MATIC W222 (2015)
I drilled two holes for the rear bolts so I could access them with a torque wrench. It was quite simple, the material was not particularly hard.
Just do it carefully so you don't damage the oil pan.
#28
Genius solution. I will look at mine again with that in mind. That plate is different on my non-4matic because the rolled edge of the plate is directly under the transmission bolts. Also mine has 3 inner bolts for the transmission mount instead of 4. I can reach the transmission pan bolts with the e-torx wrench, but not with a socket and torque wrench to get the proper 4 NM when the plate is blocking.