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7 Series - E65 / E66 (2002 - 2008)
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  #1  
Old 07-12-2014, 10:34 PM
wog boy wog boy is offline
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Location: Australia
 
Join Date: Aug 2010
Posts: 204
Mein Auto: E66 750Li
Vacuum Pump Chamber

So because my car thought I had nothing better to do these school holidays it started to leaking engine oil from the vacuum pump area. I have removed the vacuum pump and have found that it is only leaking engine oil from the mounting o'ring of the upper timing case as you can see signs of the oil trail on the dust however after I removed the vacuum pump and placed it on my bench a fair amount of oil leaked out of the input shaft area, I see there is an oil gallery slot in the upper timing case to lubricate the input shaft bush/bearing but should there be another seal to stop the engine oil getting drawn into the vacuum pump chamber or is it always oil bathed to lubricate the rotary vane in there? I rotated the vacuum pump body over and there was no oil leaking out of both the vacuum ports

I have searched the few posts but could not find an answer
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Last edited by wog boy; 07-12-2014 at 10:37 PM. Reason: i can't spell
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  #2  
Old 07-13-2014, 01:30 PM
meangreen94z meangreen94z is offline
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Location: Houston
 
Join Date: Jun 2010
Posts: 44
Mein Auto: 2004 BMW 745i sport
Yes, the pump is oil lubricated. When rotating the drive it will force oil out of the pump. There is a passage built into the upper timing cover that feeds oil into the pump. The vacuum pump is driven by the VANOS adjustment unit on the exhaust cam, meaning it rotates at half the speed of the crankshaft. At 2-3,000 RPM, think of the heat the pump vanes would generate against the housing without oil lubrication/cooling? It would lockup/tear it self apart almost immediately. Additionally it needs the lubrication for sealing purposes to generate vacuum.
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  #3  
Old 07-13-2014, 11:27 PM
wog boy wog boy is offline
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Location: Australia
 
Join Date: Aug 2010
Posts: 204
Mein Auto: E66 750Li
Thanks for the info

Ordered a genuine vacuum pump mounting o'ring today from my local Dealer who is 950 km's away
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oil leak timing case, timing case, vacuum pump, vacuum pump leaking


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