Cam plugs on the Coupe
Thread Starter
Junior Member
Joined: Jul 2021
Posts: 32
Likes: 12
From: Ontario
E550 Coupe
Cam plugs on the Coupe
Hi there,
I've got an oil leak that I've narrowed down to the drivers side, at the rear of the engine somewhere. It slowly drips onto the exhaust manifold. Based on what I've read, the cam plugs or the valve cover are common culprits.
The M278 engine is really shoehorned into this car! Has anyone changed these in the coupe? How the heck do you get back there? It would be great if the noise / heat shield could be removed for more access, but that looks like a tall job in itself...
I've got an oil leak that I've narrowed down to the drivers side, at the rear of the engine somewhere. It slowly drips onto the exhaust manifold. Based on what I've read, the cam plugs or the valve cover are common culprits.
The M278 engine is really shoehorned into this car! Has anyone changed these in the coupe? How the heck do you get back there? It would be great if the noise / heat shield could be removed for more access, but that looks like a tall job in itself...
Thread Starter
Junior Member
Joined: Jul 2021
Posts: 32
Likes: 12
From: Ontario
E550 Coupe
Thanks for the reply. Yes, it switches normally between sport and eco mode. Not sure how that would be related to the cam plugs? Oh, I did mean the cam oil expansion plugs / seals on the rear of the engine, not the cam position / actuators, if that is why you asked?
Hoping someone can chime in to my question in the first post.
Hoping someone can chime in to my question in the first post.
Newbie
Joined: Dec 2019
Posts: 2
Likes: 0
2015 E550
Just asking
Thanks for the reply. Yes, it switches normally between sport and eco mode. Not sure how that would be related to the cam plugs? Oh, I did mean the cam oil expansion plugs / seals on the rear of the engine, not the cam position / actuators, if that is why you asked?
Hoping someone can chime in to my question in the first post.
Hoping someone can chime in to my question in the first post.
Just asking because mine had a minor leak that I was not aware of. Check engine light came on for a day then it went away but my eco button would not turn on which is the default when it starts.
Took it to the Dealer, they had it for over 2 week replaced the ECU MCU wire harness all the fuel injectors along with the cam plugs and gaskets and both batteries. I lucked out because I had 2 weeks left on the warranty. So it did not cost me a thing. Everything has been fine since then except I had to replace 1 coil a year later. Just put the Stage 2 Renntech HHT and it feels like someone did an engine swap. So much more power I could not believe it. Good luck with yours. I still love mine.
