Oil leak

brumac800 · 09-10-2019, 09:34 PM

G’day all. I have a 2006 330i with an oil leak that is proving to be very hard to locate. There is a large amount of oil accumulating around the aircon compressor and on top of the water pump/ thermostat. All the common oil leaks have been fixed within the last year( rocker cover gasket/oil filter housing gaskets) I have even replaced the cam chain tensioner. Have any of you had this problem.

NinetyEight740 · 09-10-2019, 09:58 PM

Clean it, put dye in the oil. It’s real easy to locate at that point

Efthreeoh · 09-11-2019, 11:58 AM

Check the check valves for the VANOS solenoids. They are located in the cylinder head, in the front, above the water pump. Maybe a pervious owner replaced them and did not properly reinstall one of them.

M//SPORT · 09-11-2019, 05:12 PM

double check the actual valve cover isnt cracked very common

hassmaschine · 09-11-2019, 11:30 PM

Quote:

Originally Posted by M//SPORT

double check the actual valve cover isnt cracked very common

2006 has a metal cover, not cheap plastic. It doesn't crack...

juld0zer · 09-12-2019, 03:44 PM

It does corrode though, and doesn't like to be sanded. So if it isn't flat, it will leak but it is unlikely to be the cause of this leak. Check also the cam sensors to make sure they aren't leaking at their orings. Check underneath the motor oil cooler as it isn't visible at a glance. You will need to take the black plastic cover off

09-10-2019, 09:34 PM	#1
brumac800 Registered 0 Rep 1 Posts Drives: 2006e90 330i Join Date: Jul 2019 Location: Peel Nsw iTrader: (0)	Oil leak G’day all. I have a 2006 330i with an oil leak that is proving to be very hard to locate. There is a large amount of oil accumulating around the aircon compressor and on top of the water pump/ thermostat. All the common oil leaks have been fixed within the last year( rocker cover gasket/oil filter housing gaskets) I have even replaced the cam chain tensioner. Have any of you had this problem.
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09-10-2019, 09:58 PM	#2
NinetyEight740 Major General 231 Rep 5,691 Posts Drives: 2 - 2013 535i msport Join Date: Nov 2008 Location: Orange County California iTrader: (2) Garage List 2010 E91 [0.00]	Clean it, put dye in the oil. It’s real easy to locate at that point
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09-11-2019, 11:58 AM	#3
Efthreeoh General 17207 Rep 18,696 Posts Drives: The E90 + Z4 Coupe & Z3 R'ster Join Date: May 2012 Location: Virginia iTrader: (0)	Check the check valves for the VANOS solenoids. They are located in the cylinder head, in the front, above the water pump. Maybe a pervious owner replaced them and did not properly reinstall one of them.
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09-11-2019, 05:12 PM	#4
M//SPORT New Member 0 Rep 8 Posts Drives: BMW 325i n53 Join Date: Sep 2019 Location: UK iTrader: (0)	double check the actual valve cover isnt cracked very common
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09-12-2019, 03:44 PM	#6
juld0zer Lieutenant Colonel 480 Rep 1,600 Posts Drives: Prev 135i 7DCT, Now 130i 6sp Join Date: Jul 2016 Location: 2153 iTrader: (0)	It does corrode though, and doesn't like to be sanded. So if it isn't flat, it will leak but it is unlikely to be the cause of this leak. Check also the cam sensors to make sure they aren't leaking at their orings. Check underneath the motor oil cooler as it isn't visible at a glance. You will need to take the black plastic cover off
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