OIL LEAK - Help - Mercedes Benz SLK Forum

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#1 Old 03-16-2013
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OIL LEAK - Help

Hi
I'm hoping that someone may be able to share their knowledge or cast a little light on a problem that's arising with my car.
Just before I put my 22k miles 2008 SLK 55 away for the winter(Oct 2012) I had noticed that the oil dipstick tube cover from the rear of the engine was missing. It transpired that MB hadn't replaced it from the last service. Not very good!
Anyway I took the car in & they supplied a new one FOC.
I have stated the above as it MUST be coincidence but ever since the tube cover was replaced I kept getting a smell of oil in the car. This continued for a few weeks till i put the car away for winter.
I am just in the process of putting it back on the road from 1st April & so have been preparing it in anyway I can.
However after starting it up after 4+ months & letting it tick over for a while the smell came back; when the engine got warm. There is nothing coming from the exhaust. However there is light oily smell smoke coming from the drivers (right hand) side of the engine bay near the exhaust manifold.
My initial thoughts were that oil could be leaking from the rocker cover gasket although there is no sign of any oil externally.
I had to mention the dipstick plug as it happened straight away after the installation.
Hopefully it wasn't taken out to relieve any crankcase pressure or anything nasty like that.
Any thoughts would be gratefully appreciated
Cheers
Mike
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#2 Old 03-16-2013
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I had a similar problem and it was the round plastic plugs leaking through their o rings at the top of the engine. There is one big one about 2" diameter and 2 smaller ones about 1" in diameter. Total cost from the MB dealer was around $30.
It's a cheap fix and took me about 10 minutes to replace them.
There are a few posts with some good pictures kicking around here somewhere.
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#3 Old 03-16-2013
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Nothing around the valve covers? Those are a known source of leaks. I had to do mine at 22,000 miles ...
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#4 Old 03-17-2013
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Originally Posted by rodell View Post
Nothing around the valve covers? Those are a known source of leaks. I had to do mine at 22,000 miles ...
What he said. If you know how to remove your AMG intake box, or at least the front tubes, check to see if there is some oil seepage on the valve covers. I just had this service done along with spark plugs.


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#5 Old 03-18-2013
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Oil Leak -Uodate SLK 55

Took a bit of time out today & removed the front of the engine cover.
Thereon i could see some oil deposits as per the pictures below (right hand side of cylinder head). Confusingly the first shows oil on some black covers that are perfectly clean on the left side. However i don't know what they are. Anyone know here please?
Also they look to be higher that the cam covers!
The second picture is at the back of the engine (same side) & you can see where i have rubbed my fingers through the oil. Its also on the exhaust manifold below this point.
I cant see any of the round plugs referred to in the SLK 350 oil leak threads. Does anyone know whether they are particular to the SLK 350 only?
Jamesslk 55 has been with this problem & thinks this may be the case.
If so it points me towards the cam cover unless anyone else has any other thoughts?
Thanks
Mike
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#6 Old 03-19-2013
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Quote:
Originally Posted by tiledhouse View Post
Took a bit of time out today & removed the front of the engine cover.
Thereon i could see some oil deposits as per the pictures below (right hand side of cylinder head). Confusingly the first shows oil on some black covers that are perfectly clean on the left side. However i don't know what they are. Anyone know here please?
Also they look to be higher that the cam covers!
The second picture is at the back of the engine (same side) & you can see where i have rubbed my fingers through the oil. Its also on the exhaust manifold below this point.
I cant see any of the round plugs referred to in the SLK 350 oil leak threads. Does anyone know whether they are particular to the SLK 350 only?
Jamesslk 55 has been with this problem & thinks this may be the case.
If so it points me towards the cam cover unless anyone else has any other thoughts?
Thanks
Mike
I believe your problem is the valve cover gaskets, which need to be replaced. The round plugs in the rear of the SLK350's engine I believe only applies to the SLK350. You'll need the following parts:

1130160321: gasket (right)
1130160221: gasket (left)
003989982010: sealant

Have you checked your spark plugs yet?


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#7 Old 03-19-2013
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Plugs at rear of engine

JPeter,
I have the black plug leak problem on my 05' SLK, any info on the fix would be very helpful. I have not been able to find any pics or help on search.
Thank you,
willy
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#8 Old 03-19-2013
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350 SLK oil leak

there you go, this should help

https://www.slkworld.com/slk-r171-gen...slk-350-a.html


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#9 Old 03-20-2013
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cam plug cap

This forum and the people are the best!
Thank you all,
willy
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#10 Old 03-20-2013
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That's because they don't exist on the V8. The valve covers on the '55 traditionally weep, and you usually smell it before you find it.

Search for Arno's (PropDr) post on replacing the gaskets - its not that bad a task.

Quote:
Originally Posted by tiledhouse View Post
I cant see any of the round plugs referred to in the SLK 350 oil leak threads. Does anyone know whether they are particular to the SLK 350 only?
Jamesslk 55 has been with this problem & thinks this may be the case.
If so it points me towards the cam cover unless anyone else has any other thoughts?
Thanks
Mike

Last edited by WoZ53; 07-06-2018 at 10:08 AM.
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#11 Old 03-20-2013
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The dealer quote on my SLK55 gaskets was $450. Well worth doing it yourself if you can.
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#12 Old 03-20-2013
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Quote:
Originally Posted by UK-C200 View Post
Search for Arno's (PropDr) post on replacing the gaskets - its not that bad a task.
Replacing the gaskets is roughly $500 labor at the dealer. Good idea to change out the spark plugs at the same time if you haven't already. There may be some discount in overlapping service. Also better to find all parts online-much cheaper than the dealer.


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#13 Old 03-23-2013
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Job completed

I would encourage anyone to have a go at a leaking cam cover gasket as no special tools are needed & it was much easier than i had anticipated.
On mine it happened to be the breather box on top of the cam cover which has been the cause of many leaks referred to here. As it happened the cam cover was fine albeit the bolts were a little loose.
In fact the breather box bolts which run through the cam cover to the cylinder head were so loose I could turn one with my fingers.
A situation that's also been referred to in these forums.
In the end i decided to do both sides as i was able to see some seepage on the left cam cover breather/oil filler cover.
What took the most time was the preparation. Getting the old sealant off & de-oiling really well to give the new sealant a good base to stick to.
I also removed the coil packs (one bolt each, along with an electrical plug connector). This enabled me to have a really good inspection of both cam cover gaskets. Incidentally, the left one was fine as well. However, again the bolts were quite loose & I torqued them up a little.
I have no worry now about changing the spark plugs myself as they were there to do. My only addition would be to buy a new mini, multi angle ratchet for the plug at the bulkhead end of each bank; as its a little tight.
To conclude I cannot comprehend how MB charge the prices they do in Labour for cam cover gasket & spark plug change work & I would bet (given the photo's I've studied on this site) that several of the cam cover leaks have been attributed just to the cam cover breather boxes; which as it turns out is even quicker & easier to do.
So if you have the leak problem whip the air filter boxes off as per the great instructions from the etyu thread 'green filter install'.
This should reveal all. Thanks for the info on this thread. I have saved myself a pretty penny or two. Learnt a lot & have no inhibitions about doing the spark plugs in the future & Oh! I changed my air filters at the same time. A thank you to James for the correct torque figures for the bolts involved.
Best
Mike
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#14 Old 04-23-2013
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Weeping gaskets. Thanks to this forum I knew what to look for when I bought my car used. I told the dealer about it and they took $500 off if I had them fixed myself. They were covered under warranty and replaced at 28k miles.


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