Obscure M156 failure point?
02-10-2019, 12:00 PM
#1
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2012 P31 C63 Coupe Trackrat, 2019 GLE63S Coupe Beast
Obscure M156 failure point?
Oil Pressure Relief Piston O-Ring Failure
Ever hear of this one? https://oppositelock.kinja.com/in-wh...o-r-1651935795
Forgot how I stumbled across this, I think looking for info on the oil thermostat. Take it with a grain of salt due to the source, but the comments section is full of people with experience replacing this. And it looks like the job sucks.
Seems like AMG released an upgraded cover and o-ring for the M156, possibly in time for the early C63 models. Possibly not.
Some of the guys with older C63s or M156 might want to put this on their “to watch” list. I don’t see any mentions here on MBW.
Ever hear of this one? https://oppositelock.kinja.com/in-wh...o-r-1651935795
Forgot how I stumbled across this, I think looking for info on the oil thermostat. Take it with a grain of salt due to the source, but the comments section is full of people with experience replacing this. And it looks like the job sucks.
Seems like AMG released an upgraded cover and o-ring for the M156, possibly in time for the early C63 models. Possibly not.
Some of the guys with older C63s or M156 might want to put this on their “to watch” list. I don’t see any mentions here on MBW.
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MBNRG (02-11-2019)
02-10-2019, 05:18 PM
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2010 C300 4MATIC........ 2011 C63 AMG.............. 2015 CLS400 4MATIC.....
So I actually clicked the link this time, and I actually read that like 2 weeks ago lol.
As far as the m113k goes, I recently watched a video, maybe it's similar, I'm going to link it here Ina sec...
As far as the m113k goes, I recently watched a video, maybe it's similar, I'm going to link it here Ina sec...
02-10-2019, 05:20 PM
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2010 C300 4MATIC........ 2011 C63 AMG.............. 2015 CLS400 4MATIC.....
BOOM, here ya go...
And I bet your biscuits it's probably the same one...
https://youtu.be/mb1mf5cuw78
And I bet your biscuits it's probably the same one...
https://youtu.be/mb1mf5cuw78
02-10-2019, 05:55 PM
#5
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Nice find. Go to 4:50 
I wonder if as they say, excessive heat on that o-ring (for cars that are tracked for example), could cause it to harden and fail? Don’t know if the AMG “fix” was just to the cover but to the o-ring as well? Think I need to do some digging...
I wonder if as they say, excessive heat on that o-ring (for cars that are tracked for example), could cause it to harden and fail? Don’t know if the AMG “fix” was just to the cover but to the o-ring as well? Think I need to do some digging...
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MBNRG (02-11-2019)
02-10-2019, 07:31 PM
#6
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If I remember right the cover changes to a 159 part # and I think some additional parts are needed to fit that cover. O-ring has no change. I ran a bead of silicone around cover for even more securement. Only done 2 repairs, must people decline repair. Slow seepage
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02-10-2019, 09:13 PM
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Thanks. The article made it seem potentially catastrophic. Glad to know it’s not necessarily.
Do you know if AMG used the 159 part on the C63?
Do you know if AMG used the 159 part on the C63?
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02-10-2019, 09:38 PM
#8
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if you have the 156 # the part supersedes to the 159 # to use. Not sure if it’s pre facelift or facelift change. I’ve only seen early models m156. Just oil leak. I’ll see if I can come up with any info parts wise tomorrow
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MBNRG (02-11-2019)
02-11-2019, 01:57 AM
#9
Please let us know what you find, and if MB EPC gives a date when they changed to updated cover, o-ring, or both?
02-11-2019, 11:41 AM
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Good stuff bud, thanks
