Oil leak pics. Is this my cam plug(s)? Glyn?
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2009 Mercedes C350
Oil leak pics. Is this my cam plug(s)? Glyn?
I have an oil leak and wanted to share some pics to see if it would help diagnose where it is coming from. I suspect the cam plugs I hear everyone talk about leaking on these motors.
Here is where it is splashing/dripping on my covers under the motor/tranny
![](http://i32.photobucket.com/albums/d3/GLPstandard/IMG_20140315_093729_863.jpg)
Leaking onto the steering "U" joint
![](http://i32.photobucket.com/albums/d3/GLPstandard/IMG_20140315_082610_241.jpg)
Oil up around headers
![](http://i32.photobucket.com/albums/d3/GLPstandard/IMG_20140315_082632_829.jpg)
Im assuming that plug way up there is the cam plug? If so, it has oil leaking out of it, yeah..?
![](http://i32.photobucket.com/albums/d3/GLPstandard/IMG_20140315_082558_929.jpg)
Closeup of what I suspect is the cam plug
![](http://i32.photobucket.com/albums/d3/GLPstandard/IMG_20140315_082759_678.jpg)
Does this look consistent with a cam plug leak?
Thanks in advance. Id like to get this taken care of asap, so any input is appreciated.
Here is where it is splashing/dripping on my covers under the motor/tranny
![](http://i32.photobucket.com/albums/d3/GLPstandard/IMG_20140315_093729_863.jpg)
Leaking onto the steering "U" joint
![](http://i32.photobucket.com/albums/d3/GLPstandard/IMG_20140315_082610_241.jpg)
Oil up around headers
![](http://i32.photobucket.com/albums/d3/GLPstandard/IMG_20140315_082632_829.jpg)
Im assuming that plug way up there is the cam plug? If so, it has oil leaking out of it, yeah..?
![](http://i32.photobucket.com/albums/d3/GLPstandard/IMG_20140315_082558_929.jpg)
Closeup of what I suspect is the cam plug
![](http://i32.photobucket.com/albums/d3/GLPstandard/IMG_20140315_082759_678.jpg)
Does this look consistent with a cam plug leak?
Thanks in advance. Id like to get this taken care of asap, so any input is appreciated.
#2
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![](https://staticssl.ibsrv.net/autocomm/Content/MB/mbwambassador2.gif)
Yes that seems to be the cam bore blanking plug. Look at rear of both heads.
Bulletin:
Oil Seepage From Back of Cylinder Heads on Mercedes M272/273 Engines
This bulletin affects all Mercedes vehicles equipped with M272/273 engines built up to June 2008 production date.
If you receive customer reports of oil seeping from Mercedes vehicles equipped with M272/273 engines, the cause could be the round plastic expansion plugs on the back of the cylinder heads (Figure 1). To resolve, perform the following.
Note: As of June 2008 production, new improved plugs were phased into production.
There are two different size plugs as listed below:
• p/n - A000 998 55 90 – 2 small expansion plugs
• p/n - A000 998 56 90 – 1 large expansion plug (engines without vacuum pump)
Remove the existing plugs, clean the opening and install new plugs (Figure 2). Note: The plug opening should free of grease or oil. No sealer should be used in the installation of the new plugs.
![](https://mbworld.org/forums/attachments/clk-class-w209/232542d1333681536-oil-leak-out-camshaft-gasket-sealer-m272-273.jpg)
Bulletin:
Oil Seepage From Back of Cylinder Heads on Mercedes M272/273 Engines
This bulletin affects all Mercedes vehicles equipped with M272/273 engines built up to June 2008 production date.
If you receive customer reports of oil seeping from Mercedes vehicles equipped with M272/273 engines, the cause could be the round plastic expansion plugs on the back of the cylinder heads (Figure 1). To resolve, perform the following.
Note: As of June 2008 production, new improved plugs were phased into production.
There are two different size plugs as listed below:
• p/n - A000 998 55 90 – 2 small expansion plugs
• p/n - A000 998 56 90 – 1 large expansion plug (engines without vacuum pump)
Remove the existing plugs, clean the opening and install new plugs (Figure 2). Note: The plug opening should free of grease or oil. No sealer should be used in the installation of the new plugs.
![](https://mbworld.org/forums/attachments/clk-class-w209/232542d1333681536-oil-leak-out-camshaft-gasket-sealer-m272-273.jpg)
![](https://mbworld.org/forums/attachments/clk-class-w209/232543d1333681536-oil-leak-out-camshaft-gasket-sealer-m272-273.jpg)
#3
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Thanks, thats what I figured. Putting in an order for new plugs as we speak. Does anything need to be removed to get to them from the top, or is just a simple reach back there, pop the old ones out and put the new ones in?
#4
Super Moderator
![](https://staticssl.ibsrv.net/autocomm/Content/MB/mbwambassador2.gif)
With the airbox off you can get there. Your configuration has no vacuum pump.
#7
M278 rear oil leak
Yes that seems to be the cam bore blanking plug. Look at rear of both heads.
Bulletin:
Oil Seepage From Back of Cylinder Heads on Mercedes M272/273 Engines
This bulletin affects all Mercedes vehicles equipped with M272/273 engines built up to June 2008 production date.
If you receive customer reports of oil seeping from Mercedes vehicles equipped with M272/273 engines, the cause could be the round plastic expansion plugs on the back of the cylinder heads (Figure 1). To resolve, perform the following.
Note: As of June 2008 production, new improved plugs were phased into production.
There are two different size plugs as listed below:
• p/n - A000 998 55 90 – 2 small expansion plugs
• p/n - A000 998 56 90 – 1 large expansion plug (engines without vacuum pump)
Remove the existing plugs, clean the opening and install new plugs (Figure 2). Note: The plug opening should free of grease or oil. No sealer should be used in the installation of the new plugs.
![](https://mbworld.org/forums/attachments/clk-class-w209/232542d1333681536-oil-leak-out-camshaft-gasket-sealer-m272-273.jpg)
![](https://mbworld.org/forums/attachments/clk-class-w209/232543d1333681536-oil-leak-out-camshaft-gasket-sealer-m272-273.jpg)
Bulletin:
Oil Seepage From Back of Cylinder Heads on Mercedes M272/273 Engines
This bulletin affects all Mercedes vehicles equipped with M272/273 engines built up to June 2008 production date.
If you receive customer reports of oil seeping from Mercedes vehicles equipped with M272/273 engines, the cause could be the round plastic expansion plugs on the back of the cylinder heads (Figure 1). To resolve, perform the following.
Note: As of June 2008 production, new improved plugs were phased into production.
There are two different size plugs as listed below:
• p/n - A000 998 55 90 – 2 small expansion plugs
• p/n - A000 998 56 90 – 1 large expansion plug (engines without vacuum pump)
Remove the existing plugs, clean the opening and install new plugs (Figure 2). Note: The plug opening should free of grease or oil. No sealer should be used in the installation of the new plugs.
![](https://mbworld.org/forums/attachments/clk-class-w209/232542d1333681536-oil-leak-out-camshaft-gasket-sealer-m272-273.jpg)
![](https://mbworld.org/forums/attachments/clk-class-w209/232543d1333681536-oil-leak-out-camshaft-gasket-sealer-m272-273.jpg)
I have a m278 2012 S550 I have a leak in the rear of the engine I did change one of these plugs but can't find the other ones does anyone know how many of these plugs are there on the m278? Thank you!