2014 c300 m276 Leaking from front cam covers
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Junior Member
Joined: Sep 2018
Posts: 17
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c300 sport
2014 c300 m276 Leaking from front cam covers
Hi all, brand new here. I have a new to me 2014 c300 sport 4matic. The front of the engine is covered in oil originating from the valve cover face plates that house the cam sensor magnets. Those are definitely leaking and I've ordered new o rings for those. Not sure if the covers themselves are leaking. Just went in and de-gunked for better leak forensics. I've seen an official training video from MB stating that the 7 bolts that hold the face plates on are aluminum and single use. Can anyone verify this? If so, what is the part number for these bolts?
Also- has anyone had to reseal the faceplates at 45-55k miles on their m276? I know leaking from the sensor magnets is common on both m272s and 76s and other engines.
Also- has anyone had to reseal the faceplates at 45-55k miles on their m276? I know leaking from the sensor magnets is common on both m272s and 76s and other engines.
Super Member
Joined: Apr 2013
Posts: 909
Likes: 64
2007 cls550
I did when I replaced idler gear in CLS550. I have no idea why the bolts cannot be reused. Torque is crazy minimal and you use the black Mercedes rtv silicone around the entire thing. There is a specific bead thickness to use and you have to work quickly.
Getting it off is a complete pain. Clean up with brake cleaner and careful use of razor blade.
I would be surprised that it is leaking though. But no big deal if it is.
Getting it off is a complete pain. Clean up with brake cleaner and careful use of razor blade.
I would be surprised that it is leaking though. But no big deal if it is.
MBWorld Fanatic!
Joined: Sep 2014
Posts: 1,051
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From: LaLaLand
2015 GLK350 & 2020 C300
Bolts are N000000006365 (or use equivalent aluminium M6x1-16mm long flange bolts). should be 8 on each bank.
Regarding the torque, 5 Nm is perfect for the application. You can look up engineering handbooks and will say aluminium bolt into alloy part is around that maximum range for that sized thread.
Regarding the torque, 5 Nm is perfect for the application. You can look up engineering handbooks and will say aluminium bolt into alloy part is around that maximum range for that sized thread.
Member
Joined: Apr 2013
Posts: 129
Likes: 3
From: Fort Hood, TX
C300 W204 Luxury
One thing I discovered while doing mine is, instead of razor blades...I used Magic Eraser. It's a foam pad thats slightly abrasive, but spray the area with cleaner, and then use the pad. It really works alot better than anything...I've bought brakleen/oops/engine degreaser/loctite sf 7063/permatex in the past few days trying to find the easiest and mess free method...magic eraser did the trick without gouging the metal. That or my finger nail, but that starts to hurt after a while...
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Thread Starter
Junior Member
Joined: Sep 2018
Posts: 17
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c300 sport
Good to hear from someone who has done it! I cleaned the passenger side head cover area and associated drip down all the way on to the alternator believe it or not. Things been leaking for a while... If I catch it coming from the o ring on the cam magnets, I'm not even going to bother removing the cam plates.
Thanks again gents. Good to hear feedback on an engine that isn't that well documented on the internet yet.
Thanks again gents. Good to hear feedback on an engine that isn't that well documented on the internet yet.
Junior Member
Joined: Jul 2024
Posts: 50
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From: UK, Oxfordshire
C350 NA
Any reason why we can't replace the alloy bolts with steel or stainless ? Obviously not going to over-tighten them, but it's pretty normal to use steel bolts into aluminium, it happens everywhere !
