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  #1  
Old 11-21-2005, 01:44 PM
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My oil is leaking

I have a 91 300ce that the oil is leaking in the front of the engine. Does anyone know what it is. I think that the head gasket may be too old that is why the oil is leaking; however , it only leak in the front but not the back. That is why I am not so sure about it. Please help thanks a lot

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  #2  
Old 11-21-2005, 02:42 PM
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You are asking too general a question, it could be a Head Gasket, timing chain cover or valve covers, clean the engine and run it till it leaks and find where the oil is leaking from
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2004 SL500 Black 55K Miles
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  #3  
Old 11-21-2005, 03:54 PM
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I vote for replacing the upper timing chain cover gasket (u-shaped seal). One of the characteristics of failure is that you can't see where the oil is coming from. It's hidden by all the accessories. It's also a very common problem.

But first do as Jerry said and clean the engine to make sure the leak isn't from the valve cover.
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  #4  
Old 11-22-2005, 09:33 AM
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is it difficult to replace the timing chain gasket?
thanks for your help
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  #5  
Old 11-22-2005, 10:27 AM
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It's all nuts and bolts plus some technique. This is a DIY job, but a bit more advanced than doing regular maintenance. The tricky part is using the proper sealant (Loctite 5900, or MB# 002 989 73 20 10) at the corners and metal-to-metal surfaces, avoid using sealant at the u-shaped seal, and installing the cover without rolling or damaging the seal.

For more information, search using keywords "upper timing cover seal" or "u-shaped seal".
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  #6  
Old 11-22-2005, 01:50 PM
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You could have a leaking head gasket, front timing cover seal, lower timing cover, or front main seal but likely a combination of several or all. Unless declined by the customer, I address all of these when doing the head gasket. To make a proper diagnosis you should clean the areas in question and monitor where it leaks.
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  #7  
Old 11-22-2005, 02:58 PM
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Don't forget that things like the main seal is not a fix it item unless REALLY leaking.
My front seal weeps...about 1 sanitary napkins worth every 10K miles.

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