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-   -   Obscure M156 failure point? (https://mbworld.org/forums/c63-amg-w204/735512-obscure-m156-failure-point.html)

BLKROKT 02-10-2019 12:00 PM
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.

Adi-Benz 02-10-2019 02:01 PM
Don't the m113k / e55's etc. have this problem? Somewhat rare

Adi-Benz 02-10-2019 05:18 PM
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...

Adi-Benz 02-10-2019 05:20 PM
BOOM, here ya go...

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

https://youtu.be/mb1mf5cuw78

BLKROKT 02-10-2019 05:55 PM
Nice find. Go to 4:50 :y

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...

AwdthisC63 02-10-2019 07:31 PM
Originally Posted by BLKROKT (Post 7678147)
Nice find. Go to 4:50 :y

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...
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

BLKROKT 02-10-2019 09:13 PM
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?

AwdthisC63 02-10-2019 09:38 PM
Originally Posted by BLKROKT (Post 7678299)
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?
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

MBNRG 02-11-2019 01:57 AM
Originally Posted by AwdthisC63 (Post 7678330)

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
Thank you! :y
Please let us know what you find, and if MB EPC gives a date when they changed to updated cover, o-ring, or both?

AwdthisC63 02-11-2019 10:44 AM
Originally Posted by MBNRG (Post 7678474)
Thank you! :y
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

BLKROKT 02-11-2019 11:41 AM
Good stuff bud, thanks :y


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