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      07-21-2014, 04:16 AM   #1
hotwings
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E90 Engine Leak

Hi Guys!

I have a problem with an engine leak with my E90.

I was driving on the Motorway when I saw white smoke coming out of my car, I could smell burning.

Popped open the bonnet and there seems to be a leak from a bolt on the left side of the engine (if facing the engine)

The tray is about half an inch deep with oil now. Called AA which helped me tighten the bolt, it seems to have stopped the leak from the bolt but the guy didnít seem to know what the bolt was or whether there would be any further problems.

I have took photos please see attached.

I have had a service done on this car in about 3 months ago, what problems do you guys think this is? or is it common and how do i diagnose it?

I have took it back to the garage i service this, they have confirm that they have not touch that bolt when servicing so would it be a case of it just becoming loose?

Thanks alot guys!
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      07-21-2014, 05:41 PM   #2
M3AG
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You may want to post your question in E90 post forums instead.
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      07-21-2014, 05:44 PM   #3
M3PO
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That's the timing chain tensioner I believe.
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      07-22-2014, 03:56 AM   #4
hotwings
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Quote:
Originally Posted by M3PO View Post
That's the timing chain tensioner I believe.
I see, so if it is the timing chain tensioner acting up is this a serious issue? as i have tightened it and it seems to be not leaking now (fingers crossed)

is it quite common that it loosens and leaks?
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      07-22-2014, 10:03 AM   #5
tinman831
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Quote:
Originally Posted by hotwings View Post
I see, so if it is the timing chain tensioner acting up is this a serious issue? as i have tightened it and it seems to be not leaking now (fingers crossed)

is it quite common that it loosens and leaks?
It's not common but I've read stories about that tensioner coming lose on the e46m.
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      07-22-2014, 10:45 AM   #6
hotwings
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Originally Posted by tinman831 View Post
It's not common but I've read stories about that tensioner coming lose on the e46m.
Thank you very much! I have booked with bmw on the weekend to double check now.
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      07-22-2014, 12:27 PM   #7
happos2
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Interesting. That doesn't look like a S65. Hopefully you figure it out none the less.
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      07-22-2014, 12:37 PM   #8
happos2
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Interesting. That doesn't look like a S65. Hopefully you figure it out none the less.
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      07-22-2014, 01:44 PM   #9
tinman831
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Quote:
Originally Posted by hotwings View Post
Thank you very much! I have booked with bmw on the weekend to double check now.
I wouldn't even bother taking it into BMW. Just tighten it to spec and check your oil level.
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