Leaking oil pressure port - Mercedes-Benz Forum
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post #1 of 46 (permalink) Old 11-15-2006, 07:48 AM Thread Starter
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Leaking oil pressure port

I have been experiencing an oil leak from the front of the engine of my '98 E320. I think I have identified the culprit as the oil pressure port plug/cover (also refered to as a "timing case expansion cover", anyway, see the attached picture if you are still wondering what I am talking about. Replacing the gasket seems like an easy enough thing to do, my question is: what has caused this leak? Should I be checking for a malfunctioning PCV (ie., did a pressure buildup in the crank case cause this gasket to fail)? Any thoughts on root cause, or is this just one of those things that eventually happens?

cheers...
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post #2 of 46 (permalink) Old 03-26-2009, 05:09 PM
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I have the same leak (more like a pour). Had the car towed and the expansion plug cover replaced and oil replaced as well. Drove the car home and oil is pouring out from around the cover again. Obviously something not right. Will have to have the car towed again tomorrow.
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post #3 of 46 (permalink) Old 03-26-2009, 09:53 PM
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I replaced same gasket about 6 months ago

the reason it fails is because the gasket is really a thick silicon seal that fits on the inside of that plate. About $2 at the dealer. very easy to swap out, you can even leave the belt on if you want. That thick seal gets brittle, hardens and the next thing you know oil is on the garage floor.

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post #4 of 46 (permalink) Old 03-27-2009, 03:39 AM
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Quote:
Originally Posted by korbenz View Post
the reason it fails is because the gasket is really a thick silicon seal that fits on the inside of that plate. About $2 at the dealer. very easy to swap out, you can even leave the belt on if you want. That thick seal gets brittle, hardens and the next thing you know oil is on the garage floor.
Had mine repaired at a shop yesterday. It worked fine at idle, but after driving it home at highway speed, it was pouring oil on all four sides. I wonder if the guy put the gasket in backwards. It does have an odd shape and there is a right and wrong side to it. Gasket is new. Will pull it off today and look. Very aggravating problem for something this small.
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post #5 of 46 (permalink) Old 03-27-2009, 04:01 AM
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Originally Posted by kwhombre View Post
Had mine repaired at a shop yesterday. It worked fine at idle, but after driving it home at highway speed, it was pouring oil on all four sides. I wonder if the guy put the gasket in backwards. It does have an odd shape and there is a right and wrong side to it. Gasket is new. Will pull it off today and look. Very aggravating problem for something this small.
Use sealant with the gasket, the gasket alone will not prevent leaks in a pressurised system.


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post #6 of 46 (permalink) Old 03-27-2009, 05:26 AM
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Just noticed mine leaking/pouring yesterday and was just about to post when I saw this thread. As asked in original post> is there any other thing going on here except a bad gasket? Does everyone think a gasket and sealant is best or just sealant? Is their a gasket under this or what?

Thanks
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post #7 of 46 (permalink) Old 03-27-2009, 06:46 AM Thread Starter
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Oil pressure port replaced

So to follow up on my original post, I pulled the port cover off myself and took the seal out. As was noted in one of the response posts, the seal had hardened, lost its pliability, and began to leak. I took it to the dealer for a replacement, and the first thing he brought out didn't even look like the same part. I showed him what mine looked like, and he said that it was an "old" version of the seal, but that the techs there still kept this version around because they felt that it seals better than the new version. So I bought the old version for a couple of dollars, installed it, and haven't had any more leakage. I did not put any additional sealants into the operation.
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post #8 of 46 (permalink) Old 03-27-2009, 09:28 AM
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Pulled the cover after the "mechanic" fixed it and it was still leaking profusely. The rubber gasket had been installed backwards. I flipped it and reinstalled (wish that I had had some gasket sealant) and started the car and revved to 2k rpm. No leaks. Hope that this is the end of it. Thanks for all the good advice.
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post #9 of 46 (permalink) Old 03-29-2009, 11:05 AM
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I purchased the "new" type and after driving on a trip yesterday for 7 hours at 85 mph, no leaks at all. Dealership told me they usually replace 4 items when they do this > the new cover, rubber gasket, allen head screw and gasket for the screw. This was a total cost of $29.90 tax included. The new style cover is made a little different on the underside and has a little different rubber gasket, but seems to seal very well. I did notice when I remover the old cover that the old gasket had hardened- which was causing the leak.
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post #10 of 46 (permalink) Old 03-29-2009, 11:06 AM
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ALSO>> the pics in the original post are of the "new" style cover
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