AMG GT oil separators - check valve
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18 E63s Wagon
AMG GT oil separators - check valve
Wanted to share this as this pertains to the ongoing oil separator issues with our engines. Dont know if anybody has come across this but I was watching a Tasos Moschatos video on youtube where he is replacing the coolant thermostat and waterpump on a AMG GT engine (M178 to my knowledge) and he is also replacing the oil separators while the engine is accesible. First I have seen the oil separators as just a part taken off the motor. He mentions and shows there is a check valve on the separators and says that part of the check valve gets sucked into the engine and ends up in the lower part of the oil pan in the oil pickup tube. Although the check valves on the separator he shows in the video appears to be intact (from what I watched he does not explain the reason he is replacing them) This is at around the 6:30 minute mark of the video. Link to video at bottom of post. Can find video by searching "Tasos Moschatos amg gt" on youtube there are two parts he recorded of this. You can see the part with the oil separators in the video titled part 2.
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'13 s212 63 p30. '06 LX470
Thank you for supplying this video and your marking the important section. I don’t have this model of engine, but I think many of us who read along in the forums or consider purchasing this model engine in the future are trying to figure out what it is in the separators that has become clogged. This seems to point to a pretty simple explanation in the end. I would wonder what in the new design has changed, do we think it is the material of those valves?
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Wanted to share this as this pertains to the ongoing oil separator issues with our engines. Dont know if anybody has come across this but I was watching a Tasos Moschatos video on youtube where he is replacing the coolant thermostat and waterpump on a AMG GT engine (M178 to my knowledge) and he is also replacing the oil separators while the engine is accesible. First I have seen the oil separators as just a part taken off the motor. He mentions and shows there is a check valve on the separators and says that part of the check valve gets sucked into the engine and ends up in the lower part of the oil pan in the oil pickup tube. Although the check valves on the separator he shows in the video appears to be intact (from what I watched he does not explain the reason he is replacing them) This is at around the 6:30 minute mark of the video. Link to video at bottom of post. Can find video by searching "Tasos Moschatos amg gt" on youtube there are two parts he recorded of this. You can see the part with the oil separators in the video titled part 2.
https://www.youtube.com/watch?v=JBoeA3aENYc
https://www.youtube.com/watch?v=JBoeA3aENYc
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Thank you for supplying this video and your marking the important section. I don’t have this model of engine, but I think many of us who read along in the forums or consider purchasing this model engine in the future are trying to figure out what it is in the separators that has become clogged. This seems to point to a pretty simple explanation in the end. I would wonder what in the new design has changed, do we think it is the material of those valves?
Out Of Control!!
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2014 E63S; AMS 100 octane ECU dyno tune; EDOK TCU tune; BB intakes; sprintbooster
Out Of Control!!
Joined: Jun 2004
Posts: 13,799
Likes: 3,228
2014 E63S; AMS 100 octane ECU dyno tune; EDOK TCU tune; BB intakes; sprintbooster
And the m178 doesn't seem to be as affected as the m177, when it comes to OVS and RMS, but we don't know real world numbers
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Out Of Control!!
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From: unbegrenzt
2017 GLE350 4MATIC
Has a PCV diagram for the M17x engine been posted on this site?
What is the purpose of the 2 orange check valve membranes? They allow condensed oil to return into the crankcase, correct?
The large circular tube is clearly the vapor outlet from the separator to reenter into the induction system.
The flattened/oblong tube is the expelled vapor+oil inlet from the crankcase into the separator, correct?
Has anyone considered this entire problem may be cause by PCV failure on the crankcase fresh air inlet side? In other words, not the separators? Blockage in the crankcase fresh air inlet could cause excessive crankcase vacuum and suck the RMS inward.
A full and complete PCV diagram will clarify this.
What is the purpose of the 2 orange check valve membranes? They allow condensed oil to return into the crankcase, correct?
The large circular tube is clearly the vapor outlet from the separator to reenter into the induction system.
The flattened/oblong tube is the expelled vapor+oil inlet from the crankcase into the separator, correct?
Has anyone considered this entire problem may be cause by PCV failure on the crankcase fresh air inlet side? In other words, not the separators? Blockage in the crankcase fresh air inlet could cause excessive crankcase vacuum and suck the RMS inward.
A full and complete PCV diagram will clarify this.
Last edited by chassis; Apr 13, 2025 at 10:17 PM.
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MBWorld God!
Joined: Dec 2019
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Has a PCV diagram for the M17x engine been posted on this site?
What is the purpose of the 2 orange check valve membranes? They allow condensed oil to return into the crankcase, correct?
The large circular tube is clearly the vapor outlet from the separator to reenter into the induction system.
The flattened/oblong tube is the expelled vapor+oil inlet from the crankcase into the separator, correct?
Has anyone considered this entire problem may be cause by PCV failure on the crankcase fresh air inlet side? In other words, not the separators? Blockage in the crankcase fresh air inlet could cause excessive crankcase vacuum and suck the RMS inward.
A full and complete PCV diagram will clarify this.
What is the purpose of the 2 orange check valve membranes? They allow condensed oil to return into the crankcase, correct?
The large circular tube is clearly the vapor outlet from the separator to reenter into the induction system.
The flattened/oblong tube is the expelled vapor+oil inlet from the crankcase into the separator, correct?
Has anyone considered this entire problem may be cause by PCV failure on the crankcase fresh air inlet side? In other words, not the separators? Blockage in the crankcase fresh air inlet could cause excessive crankcase vacuum and suck the RMS inward.
A full and complete PCV diagram will clarify this.
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