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Obscure M156 failure point?

 
Old 02-10-2019, 01:00 PM
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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 ďto watchĒ list. I donít see any mentions here on MBW.
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Old 02-10-2019, 03:01 PM
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Don't the m113k / e55's etc. have this problem? Somewhat rare
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Old 02-10-2019, 06:18 PM
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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...
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Old 02-10-2019, 06:20 PM
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BOOM, here ya go...

And I bet your biscuits it's probably the same one...

https://youtu.be/mb1mf5cuw78
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Old 02-10-2019, 06:55 PM
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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...
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Old 02-10-2019, 08:31 PM
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Originally Posted by BLKROKT View Post
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? Donít know if the AMG ďfixĒ was just to the cover but to the o-ring as well? Think I need to do some digging...
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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Old 02-10-2019, 10:13 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?
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Old 02-10-2019, 10:38 PM
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Originally Posted by BLKROKT View Post
Thanks. The article made it seem potentially catastrophic. Glad to know itís not necessarily.

Do you know if AMG used the 159 part on the C63?
if you have the 156 # the part supersedes to the 159 # to use. Not sure if itís pre facelift or facelift change. Iíve only seen early models m156. Just oil leak. Iíll see if I can come up with any info parts wise tomorrow
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Old 02-11-2019, 02:57 AM
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it like he stole it.
Originally Posted by AwdthisC63 View Post

if you have the 156 # the part supersedes to the 159 # to use. Not sure if itís pre facelift or facelift change. Iíve only seen early models m156. Just oil leak. Iíll see if I can come up with any info parts wise tomorrow
Thank you!
Please let us know what you find, and if MB EPC gives a date when they changed to updated cover, o-ring, or both?
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Old 02-11-2019, 11:44 AM
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Originally Posted by MBNRG View Post
Thank you!
Please let us know what you find, and if MB EPC gives a date when they changed to updated cover, o-ring, or both?
A159-180-03-75 installed from 9/6/2010 upto the date 156 number was used. O-ring A155-185-01-80 was replace by 02-80 o-ring
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Old 02-11-2019, 12:41 PM
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Good stuff bud, thanks
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