Gearbox service 7G 722.9 & upgrade to plus

[badgx]

Looking to service my own gearbox as I want to learn and intend to upgrade to the plus pan and the thicker filter. Just wondering if anyone has swapped to the plus pan and filter and if there is anything that I should watch out for, any useful tips you could recommend?

Also does the m156 S211 have an access and drain bolt at the torque converter?

I was watching this video, is there a way to power drain instead of high pressure flush? How do you drain the torque converter?

This video shows the new pan, shows some useful information about the pan and filter.

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[badgx]

Also, does anyone know if the bolts holding the pan are steel or aluminium? Assuming they're aluminium as the guy in the video says they are one time use bolts.

 

[Teego]

As I understand it you get new bolts with the service kit.

 

[geoffus]

Interesting.
Might be a good idea to measure how much fluid you remove to make sure it’s the right amount going back in, ( I didnt watch all the videos).
Do you have a torque converter drain plug ?
Easy if you have, mine is the later version and did have.
The pan bolts are one time use and alloy.

 

[badgx]

Not sure if mine has a torque converter drain plug? I really hope it does. I will need to get underneath and see if I have an access. Access should be via a small opening which is sealed behind rubbish seal.

Found the following video even more informative, looks like a straight forward job.

I am thinking of going the extra mile and swap them for steel bolts to avoid them aluminium bolts from snapping. No idea why MB use aluminium, there must be a reason for it ?

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[badgx]

Looking forward to transmission service, should keep me busy and entertained

 

[MrGreedy]

Some great tips for the 722.6 box in the how to section. Might be some carry over? Also useful method for draining torque convertor on that box, but I don't know how applicable to the newer box.
The other easier option would be to replace the ATF fluid again a few drives after the initial change, what with the dilution and mixing this will be pretty much as good as a flush (unless there were big lumpy bits in the first change), and if DIYing a second fluid change would be relatively inexpensive.

Thread 'HOW TO: change the automatic gerbox oil and flush on a 722.6 'box'

May 13, 2010

Here is my how to on an ATF change on a 722.6 box.

There are loads of pics.

First pic of the car in question a E320 W210. Make sure the engine is hot. At least a 20 min road test

• BlackC55
• automatic box change flush gerbox oil
• Replies: 117
• Forum: HOWTO

• 

Do let us know how it goes.

 

[badgx]

Some great tips for the 722.6 box in the how to section. Might be some carry over? Also useful method for draining torque convertor on that box, but I don't know how applicable to the newer box.
The other easier option would be to replace the ATF fluid again a few drives after the initial change, what with the dilution and mixing this will be pretty much as good as a flush (unless there were big lumpy bits in the first change), and if DIYing a second fluid change would be relatively inexpensive.

Thread 'HOW TO: change the automatic gerbox oil and flush on a 722.6 'box'

May 13, 2010

Here is my how to on an ATF change on a 722.6 box.

There are loads of pics.

First pic of the car in question a E320 W210. Make sure the engine is hot. At least a 20 min road test

• BlackC55
• automatic box change flush gerbox oil
• Replies: 117
• Forum: HOWTO

• 

Do let us know how it goes.

Thank you Sir, will do

 

[geoffus]

Did mine a while ago on the 722.9 7G tronic plus

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[badgx]

Did mine a while ago on the 722.9 7G tronic plus

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Thanks for the video upload, very useful tips, especially making sure to level the car correctly, and also the need for an extra magnet, definitely needs at least two. I also like the idea of using a thin metal coat hanger or rod to help accelerate the drainage from the torque converter

Do you have the size and pitch of the bolts by any chance? I'm thinking of switching to steel bolts whilst there

 

[geoffus]

Thanks for the video upload, very useful tips, especially making sure to level the car correctly, and also the need for an extra magnet, definitely needs at least two. I also like the idea of using a thin metal coat hanger or rod to help accelerate the drainage from the torque converter

Do you have the size and pitch of the bolts by any chance? I'm thinking of switching to steel bolts whilst there

I believe they are stretch bolts so one time use, is it worth using steel when they are not expensive ?

 

[st13phil]

I'm thinking of switching to steel bolts whilst there

There can be many reasons why Mercedes-Benz decided to not use steel bolts in this application, and without understanding the design intent, why deviate from what they chose?

One reason that often gets overlooked is the risk of galvanic corrosion, which may or may not be one of the criteria that drove their decision in this instance.

 

[badgx]

There can be many reasons why Mercedes-Benz decided to not use steel bolts in this application, and without understanding the design intent, why deviate from what they chose?

One reason that often gets overlooked is the risk of galvanic corrosion, which may or may not be one of the criteria that drove their decision in this instance.

I'm wondering if it's something to do with heat expansion, i.e. steel v aluminium? They used aluminium bolts for the intake manifold too on the M156 but everything else was steel bolts .

 

[MrGreedy]

It could also be better to knacker and strip a soft aluminium bolt, rather than the expensive and difficult to replace thing it bolts to?