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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 06-06-2020, 03:53 PM
mohamedrani mohamedrani is offline
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Oil Leak

Hello guys,

i noticed that there's dirty oil visible on the engine where i pointed in the photo and also in the far below the engine

i don't have white smoke or over heating problem ( the signs for blown cylinder head gasket)
and also, when the car is parked anywhere, i don't see any oil drops or spots underneath the car,
i had a problem almost 2 years ago with the heat and it went to the red zone couple of times , but it was because of the radiator so i overhauled the whole cooling system and since then it never went above the middle on the temp indicator

the mechanic said it's a blown cylinder head gasket , but as i said i don't have any symptoms , and the problem is i have a good mechanic but sometimes he's just guessing not 100% sure that's why i always use him as a handy man and just telling him what i want to change if i already know the problem and that works better with him ))

any ideas?
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Last edited by mohamedrani; 06-07-2020 at 10:48 AM.
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  #2  
Old 06-06-2020, 04:54 PM
effduration effduration is online now
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Looks like a Valve cover gasket leak, or possibly a leak in the vanos system, not a head gasket leak. If you haven't replaced the valve cover gasket, I would start there.
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  #3  
Old 06-06-2020, 04:57 PM
mohamedrani mohamedrani is offline
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Quote:
Originally Posted by effduration View Post
Looks like a Valve cover gasket leak, or possibly a leak in the vanos system, not a head gasket leak. If you haven't replaced the valve cover gasket, I would start there.
I had that in mind also , just to make sure i understand, this is the valve cover gasket right?

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  #4  
Old 06-06-2020, 06:09 PM
effduration effduration is online now
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yes
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Old 06-06-2020, 06:12 PM
mohamedrani mohamedrani is offline
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Quote:
Originally Posted by effduration View Post
yes
Thanks alot)

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Old 06-06-2020, 07:11 PM
E39Hoon E39Hoon is online now
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Quote:
Originally Posted by effduration View Post
looks like a valve cover gasket leak, or possibly a leak in the vanos system, not a head gasket leak. If you haven't replaced the valve cover gasket, i would start there.
+1
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Old 06-07-2020, 03:05 AM
528iAut 528iAut is online now
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I don't think I would worry about it but well....
Your car looks very very clean!
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Old 06-07-2020, 10:51 AM
mohamedrani mohamedrani is offline
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Quote:
Originally Posted by 528iAut View Post
I don't think I would worry about it but well....

Your car looks very very clean!
Well, i drive the BMW less these days, the jeep is better due to the weather in Russia now,
But before parking it , i cleaned the engine bay and everything , but i noticed that the oil residue appeared as mentioned , so why not to fix that too))

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Old 06-07-2020, 10:54 AM
mohamedrani mohamedrani is offline
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I'm even planning to paint the whole car, the old paint already faded and some scratches , it still has the original 98 paint and the previous owner didn't really take care of it at all

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Old 06-07-2020, 01:54 PM
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Quote:
Originally Posted by mohamedrani View Post
I had that in mind also , just to make sure i understand, this is the valve cover gasket right?

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You are gonna need to replace all 15 of the valve cover cap nut rubber grommets, if you do not do this, your new valve cover will not seal correctly.

https://www.turnermotorsport.com/p-3...r-priced-each/
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Old 06-07-2020, 07:41 PM
mohamedrani mohamedrani is offline
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Quote:
Originally Posted by bmw blue View Post
You are gonna need to replace all 15 of the valve cover cap nut rubber grommets, if you do not do this, your new valve cover will not seal correctly.



https://www.turnermotorsport.com/p-3...r-priced-each/
Thanks for the tip , will buy them too,
Just another question, will i need to seal the cover with some kind of tempruter silicone or anything, or just cleaning the place of the old rubber seal and replacing with new one and that's it ?

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Old 06-08-2020, 05:49 AM
E39Hoon E39Hoon is online now
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Quote:
Originally Posted by mohamedrani View Post
Thanks for the tip , will buy them too,
Just another question, will i need to seal the cover with some kind of tempruter silicone or anything, or just cleaning the place of the old rubber seal and replacing with new one and that's it ?

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Yes. The half circles in the back will need some high temp rtv and then a tiny dab on the front where the head meets up with the vanos.
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Old 06-08-2020, 09:47 AM
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Review the Beisan website. There are some good DIY procedures that document everything that you need to do when replacing the VCG.
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Old Yesterday, 03:05 AM
mohamedrani mohamedrani is offline
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i found this video on YouTube i guess it's a good reference

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Old Yesterday, 04:48 AM
effduration effduration is online now
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Be careful relying on Nathan's advice...He cuts a lot of corners and often gives less than excellent advice IMO...

A lot of the cars he works on seem to come back for the same problem ( head gaskets, etc.)

I think in the video you linked he insists you need to slather RTV over the entire mating surface otherwise the valve cover will leak. This is just not true. Use a good gasket (not the cheapest on ebay - buy new grommets and put a little RTV on half moons and where the head meets the vanos unit.

I watched another recent video on an AC Compressor replacement where Nathan didn't use a vacuum pump, released 134a to the atmosphere, and didn't bother to use AC gauges.

This is a better video - this is part 1, you can find part 2
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Old Yesterday, 05:19 AM
mohamedrani mohamedrani is offline
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Quote:
Originally Posted by effduration View Post
Be careful relying on Nathan's advice...He cuts a lot of corners and often gives less than excellent advice IMO...



A lot of the cars he works on seem to come back for the same problem ( head gaskets, etc.)



I think in the video you linked he insists you need to slather RTV over the entire mating surface otherwise the valve cover will leak. This is just not true. Use a good gasket (not the cheapest on ebay - buy new grommets and put a little RTV on half moons and where the head meets the vanos unit.



I watched another recent video on an AC Compressor replacement where Nathan didn't use a vacuum pump, released 134a to the atmosphere, and didn't bother to use AC gauges.



This is a better video - this is part 1, you can find part 2

Thanks for the tip, will do))

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Old Yesterday, 05:28 AM
Mr.Yuck Mr.Yuck is offline
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WOW that is clean. Not a head gasket, somebody really wanted to make some money I guess. As others said likely a valve cover gasket or a seal.
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  #18  
Old Yesterday, 06:19 AM
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I know you're working on an I6, but on the V8s, where the VANOS solenoids come through the front timing covers, the gasket(s) can leak there (mine are doing that now), so look for that too, a leak near the VANOS solenoid gasket...
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