PCV
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Joined: Aug 2019
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ML400 4Matic
PCV
Can anyone tell were and how to replace the Positive Crank Case (PCV) also referred to as the Engine Oil Separator on my 2015 W166 ML400 4 matic, SUV with a 3.0 L V6, M276 DE30 LA, Twin Turbo. I think the part no is 2760107111 and it's located under the intake manifold. Lots out there on M276 DE35 naturally aspirated. Can't find much of value for the M276 Turbo. I have a turbo coolant leak under the intake manifold and the shop says I should replace the PCV while fixing the leak. They are estimating about $1,500 CND including the PCV. I'm trying to evaluate if this is a DIY project or if $1,500 will be money well spent.
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2008 E350, 2012 ML350, 2014 E350, 2015 ML350
ADVICE: post this question on the W212 forum. You will get very detailed information on what to do. @S-Prihadi will help you .
Thread Starter
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ML400 4Matic
Thank JCM for the lead, lots of good info pertaining to the PVC system on W212 forum, however nothing specific about removal and replacement of PCV. Lots of YouTube videos on the M276 DE35 Naturally Aspirated, can’t find anything on the M276 DE30 Twin Turbo.
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From: US
2008 E350, 2012 ML350, 2014 E350, 2015 ML350
Ask directly. @S-Prihadi will love to explain it. He has disassemble his car many times, and has knowledge of this particular variant since he owns a E400 coupe.
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ML400 4Matic
Thanks again JCM, between S-Priladi's posts and a YouTube video I've figured out how to remove the intake manifold and PCV/Oil Separator system. I am now trying to find a flow diagram of the turbo cooling system. The repair shop said my turbo fluid was leaking under the intake manifold, consequently the intake manifold needs to be removed and as preventive maintenance I should also R/R the PCV/Oil Separator system for a total estimate cost of $1,500cnd. The shop told me that the turbo coolant system is totally independent from the engine cooling system and for some reason there is a part of the system under the intake manifold, however I have not been able to see this on my engine or in any of the research I've done on this form or YouTube videos. Again not much on my 3.0 L V6, M276 DE30 LA, Twin Turbo, I've also been searching parts suppliers like FCP Euro. Any help in this regard would be appreciated. I want to confirm what the shop is telling me and to determine if this is a DIY project or would the $1,500 be money well spent.
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Thread Starter
Newbie
Joined: Aug 2019
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ML400 4Matic
Thanks JCM. What a great video specific to the M276 Turbo and how not to work on an engine. Especially with a crow bar!! Video did provide clarity on the removing the PCV/Oil Separator system. I didn't see any turbo coolant lines that could be leaking under the intake manifold as suggested by the mechanic. I'm now also doubting the mechanics comment about the turbo coolant system being totally independent from the main engine. My ML400 has an electric auxiliary water pump (PN A000500386) that looks like it's connected to the turbo and main engine cooling system. Trying to find a flow diagram or a schematic..
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MBWorld Fanatic!
Joined: May 2021
Posts: 2,528
Likes: 2,044
From: US
2008 E350, 2012 ML350, 2014 E350, 2015 ML350
Thanks JCM. What a great video specific to the M276 Turbo and how not to work on an engine. Especially with a crow bar!! Video did provide clarity on the removing the PCV/Oil Separator system. I didn't see any turbo coolant lines that could be leaking under the intake manifold as suggested by the mechanic. I'm now also doubting the mechanics comment about the turbo coolant system being totally independent from the main engine. My ML400 has an electric auxiliary water pump (PN A000500386) that looks like it's connected to the turbo and main engine cooling system. Trying to find a flow diagram or a schematic..
.Master Surya rarely posts outside the W212 forum, but I recall him mentioning the auxiliary pump once. He may be able to get you the diagram out of his WIS installation.
