Oil leak pics. Is this my cam plug(s)? Glyn?
03-15-2014, 01:14 PM
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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
Leaking onto the steering "U" joint
Oil up around headers
Im assuming that plug way up there is the cam plug? If so, it has oil leaking out of it, yeah..?
Closeup of what I suspect is the cam plug
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
Leaking onto the steering "U" joint
Oil up around headers
Im assuming that plug way up there is the cam plug? If so, it has oil leaking out of it, yeah..?
Closeup of what I suspect is the cam plug
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.
03-15-2014, 06:59 PM
#2
Super Moderator
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.
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.
03-16-2014, 05:42 PM
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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?
03-16-2014, 07:39 PM
#4
Super Moderator
With the airbox off you can get there. Your configuration has no vacuum pump.
07-24-2022, 06:23 PM
#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.
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.
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!
