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Join Date: Apr 2013
Vehicle: 2005 SLK 350MT
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Oil Seepage from Cam Expansion Plugs
Date: May 27, 2009
Order No.: S-B-01.30/23b
Supersedes: S-B-01.30/23a dated May 7, 2009
All Passenger and Light Truck Models, Equipped with Engine M272 / 273
Up to approx. June 2008 Production
Oil Seepage from Back of Cylinder Head
If you receive customer reports in the above model vehicles of oil seeping from the engine, the cause could be the round plastic expansion plugs on the back of the cylinder heads.
To resolve, perform the following.
- Remove air filter housing. For Models 164 and 251, refer to WIS document AR09.10-P-1150GZA.
- Remove the existing plugs, clean the opening and install new plugs.
The plug opening should free of grease or oil. No sealer should be used in the installation of the new plugs. There are two different size plugs as listed below.
- A000 998 55 90
- 2 small expansion plugs
- A000 998 56 90
- 1 large expansion plug (engines without vacuum pump)