Bolt on the side of engine leaking!

hotwings · 07-22-2014, 02:58 AM

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 didn’t 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!

PhaseP · 07-22-2014, 09:00 AM

My guess that looks like a chain tensioner, number 7 below, not %100 sure though.

If it continues leaking and if it is the tensioner you may look into getting a new seal ring (part number 8) there and replace. The tensioner may need some mechanical reset if removed, I only had experience with a Corolla one. You may need to do some research if you need to remove it on this.

07-22-2014, 02:58 AM	#1
hotwings New Member 1 Rep 7 Posts Drives: E90 118i M-Sport Join Date: Jul 2014 Location: United Kingdom iTrader: (0)	Bolt on the side of engine leaking! 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 didn’t 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! Attached Images
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07-22-2014, 09:00 AM	#2
PhaseP Colonel 1007 Rep 2,109 Posts Drives: 325XI Join Date: May 2010 Location: Earth iTrader: (0)	My guess that looks like a chain tensioner, number 7 below, not %100 sure though. If it continues leaking and if it is the tensioner you may look into getting a new seal ring (part number 8) there and replace. The tensioner may need some mechanical reset if removed, I only had experience with a Corolla one. You may need to do some research if you need to remove it on this.
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