My particular model is a 2001 bmw 318ci.
Bmw vacuum pump oil leak.
Here are a couple pictures of the new vacuum pumpso the small black nipple fitting is for the vacuum line that goes to the vacuum pod under the engine coverthe bigger one with the yellow cap is for the brake booster vacuum linei also check that line but no oil was in iti cleaned out the vacuum lines and replaced the vacuum pumpfor some strange reasonbmw has to give.
A check valve of the brake vacuum pump may leak a small amount of lubricating oil.
318i e46 2002 175 000k i have a small oil leak that is randomly dropping oil on the exhaust at the back of the motor and burning i have replaced the valve cover gasket but still persists i thing it could be the vacuum pump which is on the back of the cylinderhead if i touch the surface their is oil on it.
Most vacuum pumps are located on the left or right side of the engine typically closer to the brake master cylinder on diesel vehicles.
Shouldnt be a problem while running but could run into the vacuum system once shut down.
The problem with the leak from the vacuum pump on my 650i is that the oil blows back onto the exhaust manifold and that stinks.
A short repair tutorial video on how to fix a vacuum pump thats leaking oil onto the exhaust and causing startup smoke and a burning smell on a e46 bmw.
Heres a picture of a vacuum pump on a n54 and n55we have noticed that he small vacuum fitting will start to pump some oil through the vacuum line this is the picture behind the vacuum portinside is a small diaphragm that starts to break apart and starts to leakletting oil getting pumped through the vacuum linethe oil then.
What part is the oil leaking from.
Degunk wash and wipe down or you will have oil remnants continue to drip as a result of the old leak for weeks until its all gone.
It looks to me like its leaking from inside the pump which would mean you have a shaft seal issue and a real problem since you dont want to short circuit oil into your vacuum system.
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Bmw is recalling certain model year 2004 2010 5 series 6 series and model year 2002 2008 7 series vehicles.
The vacuum pump requires oil to maintain proper lubrication and to reduce internal temperature due to its frequent use.