Engine Oil Leak - Mercedes-Benz Forum
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#1 (permalink) Old 01-11-2009, 09:14 AM
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Engine Oil Leak

1999 E320, Oil leak, what does it take to fix the leak? Do they sell a gasket to replace the original one? should I use a glue type of gasket forming material? Does anyone have experience with this?

If it's left alone not repaired, will it do any harm?

Thanks for your help.

Last edited by cerritos; 01-11-2009 at 09:53 AM.
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#2 (permalink) Old 01-11-2009, 09:17 AM
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Where is it leaking?
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#3 (permalink) Old 01-11-2009, 09:43 AM
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That's a good question. I don't know.

The area is under the air intake with electronics attachment. I have to disassembly many things to identify it. I'm assuming it's some kind of gasket.
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#4 (permalink) Old 01-11-2009, 10:06 AM
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It could be the valve cover gasket (is that your valve cover in the picture?), unless it's a crankcase vent that is leaking instead. You may have to clean it up a bit to identify what is actually leaking, but I would check the valve cover fasteners first. Don't crank on them, just check to ensure that they're all at least finger-tight.
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#5 (permalink) Old 01-11-2009, 12:56 PM
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Quote:
Originally Posted by Matt L View Post
It could be the valve cover gasket, unless it's a crankcase vent that is leaking instead.
This is the first time I've heard of the term "crankcase vent". Looking at the picture, it looks like some kind of "vent" leaking. ??

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(is that your valve cover in the picture?)
I guess so.

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Originally Posted by Matt L View Post
You may have to clean it up a bit to identify what is actually leaking, but I would check the valve cover fasteners first. Don't crank on them, just check to ensure that they're all at least finger-tight.
Good idea. I'll do that. Thanks.

This is a 1999 E320. Does anyone else have the same problem? I'd think that there are many 1999 E320's having similar problem.

Last edited by cerritos; 01-11-2009 at 01:03 PM.
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#6 (permalink) Old 01-11-2009, 04:19 PM
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While you may not have heard of "crankcase vent," all cars have them. In the old days, it was referred to as the "PCV system" with the associated "PCV valve." PCV means Positive Crankcase Ventilation.

All engines have crankcase vents. In the (very) old days, they were simply routed to the atmosphere. As of the last fifty years or so, the crankcase gasses have been vented to the intake manifold to be burned.
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#7 (permalink) Old 01-11-2009, 08:20 PM
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This is an extremely common problem on the M112 engine. It is leaking from the breather cover(s), with leaks on the passenger side more common. On both my E320 and SLK320 it started leaking at about 90,000 miles. Here is a picture of mine that I posted about 6 months ago. http://www.benzworld.org/forums/w210...aking-oil.html

It does not have a gasket and you need to use "gasket maker" compound. I did it about 2,000 miles back on my SLK and will do it on my E320 as soon as it gets to the next oil change. It is not a very difficult job, but it does take a lot of time to clean the covers properly. I took me about 2 hours to do the passenger cover, 10 minutes to remove, 1 hours 30 minutes to clean, 10 minutes to apply the gasket maker and 10 minutes to re-install.

I used this article as a basic guide: Resealing the Recirculating Cover on M112s - CrossfireForum.org
It was posted in the Crossfire forum, but is EXACTLY the same as my SLK320. There is a slight difference in the E Class, in that we have an additional intake damper that have to be removed or swung aside. The most important thing if you use the method in the article, is to ensure that none of the old gasket ends up in your engine. After removing the breather covers, I first dried the chambers completely with paper towels, making sure to suck up all standing oil. I then plugged the 3 holes with paper towels. Only after this did I start removing the old gasket, always cleaning to the outside of the chamber. Once cleaned, I vacuumed the chamber out and gave it another good wipe-out. To clean the gasket from the breather cover, I used some brake cleaner aerosol as an initial starter, followed by manual cleaning.

O yes, very important!! You'll notice that some of the threads refer to an 8Nm torque. That ONLY applies to the large bolts - NOT the small ones. (Don't ask me how I found that out )

In spite of what some people believe, you don't have to go to the MB dealer to buy the gasket maker. Permatex Black works perfect.



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#8 (permalink) Old 01-11-2009, 11:00 PM
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Thanks for the valuable information. That's what I thought, it's a common problem.

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O yes, very important!! You'll notice that some of the threads refer to an 8Nm torque. That ONLY applies to the large bolts - NOT the small ones. (Don't ask me how I found that out )
What's the torque for the smaller bolts?

Last edited by cerritos; 01-11-2009 at 11:11 PM.
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#9 (permalink) Old 01-12-2009, 07:53 AM
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dear benz owners,
i also have the same problem. I have an M112 engine. According to my mechanic it was the head gasket that was causing the problem. According to him it was a common problem. It would cost around 2000 CHF to get the problem fixed. Is he lying to me or is this price reasonable. I was thinking of using a fuel additive called STOP ENGINE OIL LEAK produced by stp. Also will using this additive cause any harm to my engine??
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#10 (permalink) Old 01-12-2009, 10:50 AM
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dear benz owners,
i also have the same problem. I have an M112 engine. According to my mechanic it was the head gasket that was causing the problem. According to him it was a common problem. It would cost around 2000 CHF to get the problem fixed. Is he lying to me or is this price reasonable. I was thinking of using a fuel additive called STOP ENGINE OIL LEAK produced by stp. Also will using this additive cause any harm to my engine??
First, I would not suggest the use of any oil additives and I'm pretty sure no one here will recommend them to you. The only exception would be an engine that is really just shot and you're adding thickeners to slow horrible leaks or blow-by, but that's just a stopgap solution until rebuild time in the immediate future.

The M112 is NOT known for head gasket problems and if you have an oil leak on top of your valve covers then it is NOT the head gasket. The head is below the valve cover and the head gasket is between the head and the block, so the oil would have to travel a bizarre path upwards for a 1/3 meter or more, which doesn't happen. So if you've got the film displayed in the OP's pictures up atop the valve cover, then do the fix Kobus posted and you'll be good to go. (And if that is the leak location I'd think about finding another mechanic...)

Take care and enjoy the ride,
Greg

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