Passenger Side Cam Plug Blown Out of the Hole 2010 E350C
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Joined: Jul 2023
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E350
Passenger Side Cam Plug Blown Out of the Hole 2010 E350C
Hi everyone,
I have a 2010 E350 Coupe with 118k miles. I recently resealed the passenger side valve cover and changed the crankcase oil separator cover due to oil leak. I did not replace the crankcase oil separator. After putting everything back together, the camshaft expansion plug on the passenger side won't stay inside the hole. For about a few seconds after I start up the engine, the cam plug will be blown out of the hole and stream of oil would come out of the hole. I tried using my fingers to keep it in place but I couldn't. The pressure is very high that pushes the plug out.
Here are some of my thoughts:
1. The crankcase pressure is definitely too high.
2. Maybe the crankcase oil separator cover was defective. I doubt it would cause this problem because there was no valve in it.
3. Maybe I put too much RTV gasket on the valve cover in some area that blocked off some oil or air passages?
4. Maybe I miss a hose or connector somewhere?
Have anyone of you seen this problem in the M272 or similar engine?
Thank you for your input.
I have a 2010 E350 Coupe with 118k miles. I recently resealed the passenger side valve cover and changed the crankcase oil separator cover due to oil leak. I did not replace the crankcase oil separator. After putting everything back together, the camshaft expansion plug on the passenger side won't stay inside the hole. For about a few seconds after I start up the engine, the cam plug will be blown out of the hole and stream of oil would come out of the hole. I tried using my fingers to keep it in place but I couldn't. The pressure is very high that pushes the plug out.
Here are some of my thoughts:
1. The crankcase pressure is definitely too high.
2. Maybe the crankcase oil separator cover was defective. I doubt it would cause this problem because there was no valve in it.
3. Maybe I put too much RTV gasket on the valve cover in some area that blocked off some oil or air passages?
4. Maybe I miss a hose or connector somewhere?
Have anyone of you seen this problem in the M272 or similar engine?
Thank you for your input.
Super Member
Joined: Aug 2004
Posts: 958
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E550 Coupe 2wd (2016)
Pictures please.Because I can't imagine what plug you're talking about. You can't mean the cam actuator, right? If you mean the plug on the back, then yes, you may have used too much sillycone and plugged the drain so it has nowhere to go
And if you suspect crankcase pressure you can just remove the oil cap.
And if you suspect crankcase pressure you can just remove the oil cap.
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Newbie
Joined: Jul 2023
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E350
Thanks for the feedback.
It was the plastic plug on the back of the valve cover. I removed the valve cover, cleaned all the grooves and put everything back together today.
I left the oil cap off when I started the engine. The plug stayed in place with no oil leak so I installed the oil cap. Even with the oil cap on, the plug didn't get blown out so I think the original problem was due to excessive gasket material on the valve cover that blocked off some oil passages.
Your advise was greatly appreciated. Hope this post will help someone in the future.
It was the plastic plug on the back of the valve cover. I removed the valve cover, cleaned all the grooves and put everything back together today.
I left the oil cap off when I started the engine. The plug stayed in place with no oil leak so I installed the oil cap. Even with the oil cap on, the plug didn't get blown out so I think the original problem was due to excessive gasket material on the valve cover that blocked off some oil passages.
Your advise was greatly appreciated. Hope this post will help someone in the future.
