Can't find 722.9 torque converter drain plug - Mercedes-Benz Forum
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#1 (permalink) Old 08-19-2014, 01:41 AM
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Can't find 722.9 torque converter drain plug

Have just got around to changing the fluid in my NAG 2 {Neues Automatische Getriebe 2} New Automatic Gearbox 2 or 7G-Tronic 7-speed (722.9) 722 901 00 003 799 (Build Code 427 AUTOMATIC TRANSMISSION 7-SPEED).

I spent ages searching the Forum to make sure I had identified the correct parts. I concluded mine is the updated transmission (which started in August 2003) ie the 7G-Tronic or 722.9 NAG2 with updated pan which has a bevelled or sloping aft end with round indentations, a white overflow pipe and uses red 236.14 fluid measured at 45C. I have yet to check the colour of the pipe.

I purchased the filler kit, filter, gasket, screws, overflow pipe, torque converter plug, drain plug washer and 10L of genuine M-B fluid but have been putting off doing the job for months.

Now that I have started I cannot find a drain plug in the torque converter. The access ports on my tranny don't match the one shown in BenzWorld's Elite Member G-AMG and MB World’s Member, johnand (John Anderson) who have published excellent write-ups on the DIY job.

When viewed from the rear I have two access ports
Can't find 722.9 torque converter drain plug-722.9-transmission-viewed-rear.jpg
Can't find 722.9 torque converter drain plug-722.9-transmission-closeup-rear-ports.jpg
and when viewed from the front I have one large access port on the torque converter housing. See photos.
Can't find 722.9 torque converter drain plug-722.9-transmission-viewed-front.jpg
I have rotated the engine according to the DIY instructions but cannot see any drain plug. I can just make out an engraved number on the actual torque converter, MB 112 032 02 47 MB. eBay has this shown as a W220 S-CLASS Starter Flywheel Flexplate, see photo.
Name:  W220 S Class Starter Flywheel Flexplate.JPG
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So I presume I just go ahead with the rest of the job and ignore draining the torque converter?

Any advice much appreciated.

Regards, Brian

Last edited by ricebubbles; 08-20-2014 at 05:13 AM. Reason: Posted photos into text.
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#2 (permalink) Old 08-19-2014, 02:00 AM
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I cannot find a 204 with the 722.901 box the full VIN number might help

Malcolm

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#3 (permalink) Old 08-19-2014, 03:04 AM
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Hi Malcolm,
Thanks for the quick reply.
My VIN is WDB2201752A387356.
Brian
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#4 (permalink) Old 08-19-2014, 03:37 AM
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Not having much luck on this,, when it comes to draining the convertor it says "vehicles with a drain screw on convertor" So some do not have one

Malcolm

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#5 (permalink) Old 08-19-2014, 03:56 AM
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Thanks for trying Malcolm. I did see a post somewhere where the DIYer had drained the trans fluid by opening one of the lines to the cooler in the radiator. If I remember correctly he had also fitted a trans dip stick so he could refill it through there.
I guess I just have to accept that my brand new, very expensive, M-B fluid will be diluted by the couple of litres of old fluid remaining in the torque converter.
What a stupid design by M-B! Everything else on the car is brilliant first class engineering, but this takes the cake.
Now that I have all the gear I plan to change the fluid regularly anyway so the fluid condition will improve each time.
I am hoping that the fluid change and new filter will improve the shifts as they have got quite noticeable lately. Not surprising with over 200,000Km on the odo and still the OEM oil.
Regards, Brian
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#6 (permalink) Old 08-19-2014, 04:24 AM
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Brian from the pictures of your transmission I would say you don't have the drain in the torque converter, when compared to the pictures in the attached pdf. 1 large round for the one with a drain that is not present on yours.

Dean
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File Type: pdf Drain gear oil from torque converter.pdf (100.4 KB, 33 views)
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#7 (permalink) Old 08-19-2014, 04:51 AM
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Thanks Dean,
That is what I had concluded as well. I had found the WIS article and noted the differences. See attached.
My trans has two smallish rectangular ports instead of the one large round one. I do have a large port on the forward facing surface but no drain plug that I can find.
Brian
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#8 (permalink) Old 08-19-2014, 05:11 AM
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Just flush it out. This is a picture of what I did with mine.
The red arrow points to the line linking the 2 spray bottles.
The yellow arrow to the gearbox inlet by the banjo bolt.
The green to the return line from the cooler by another banjo bolt.
The only problem with this setup was that the bottle feeding the oil into the gearbox didn't pump as quick as the bottle for the old oil filled. So I had to stop the motor and pinch off the link line and pump the oil in by hand twice, not a real problem as it still allowed me to completly replace all of the oil after the filter was changed.

Total cost for the setup was about $45.

Dean
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#9 (permalink) Old 08-19-2014, 10:11 AM
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Good improvising! "Cogito, ergo sum": I think, therefore, I am!

Daniel
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#10 (permalink) Old 08-19-2014, 02:47 PM
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Thank you. I will be trying it again soon, but this time I think I'll try a 1 way valve in the line for the old oil. Then I can pump a bit of presssure into the bottles before I start. This may have it work the way I intended it to, may mean I only have to stop the motor once too.

Dean
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