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w204/722.9 transmission leak

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Old 12-27-2021, 04:58 PM
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2013 C300 4matic
w204/722.9 transmission leak

Hello,

I've been noticing a slow drip towards the rear of the transmission (right behind the trans mount). I've checked a few times and there seems to be 2 spots where it accumulates shown in pic below. Nothing is glaring out when I look around, curious if anyone has any experience or advice where to start diagnosing? Searched a bunch on the forums but most reported issues seem to be more towards the front end of the trans. Thanks in advance for the help!!


Old 12-27-2021, 07:00 PM
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2009 MB C300 Sport 4matic
This bluish fluid feels oily or not...not blue coolant from a source above....coolant line through firewall ? Just thinking of odd ball sources
Old 12-27-2021, 10:09 PM
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2008 C350 Sport 4Matic Swap
Originally Posted by gamma300C
This bluish fluid feels oily or not...not blue coolant from a source above....coolant line through firewall ? Just thinking of odd ball sources
2013 722.9 has blue transmission fluid. Looks like your rear output seal is leaking. They are pretty easy to replace, just clean everything with brake cleaner and monitor the rear output seal to confirm it.
Old 12-30-2021, 10:36 AM
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Originally Posted by ltwargssf
2013 722.9 has blue transmission fluid. Looks like your rear output seal is leaking. They are pretty easy to replace, just clean everything with brake cleaner and monitor the rear output seal to confirm it.
Thanks! Do you know if there is a thread somewhere to run through the steps of this job? I've seen some random links on some pieces of the job (removal of the seal), but not a start to finish.

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