Oil leak at vacuum pump

command_liner · 10-31-2018, 01:12 PM

A search of the forum did not lead to a direct answer, so here goes.

The car is majorly apart for turbos, EGR, DPF, SCR, CAT, intercooler, exhaust, etc. With everything out of the way I see there is a non-trivial oil leak at the vacuum pump. The pump casing is crusted over with oil, and there is oil leaking down the front of the motor.

Is this a known issue?

Is the fix as simple as replacing the main o-ring for that application? My big turbo has a lot of oil in it from bad bearings (major screeching noise on boost) which is probably due to plugged DPF (as shown on the dash). Is the vacuum pump just leaking oil as a result of that general failure, or does it fail on its own?

Thanks for any thoughts.

Photo here: https://www.flickr.com/photos/comman...7702238699375/

PerfectAce · 10-31-2018, 03:50 PM

This thread might provide some insight: https://www.e90post.com/forums/showt...php?p=20806171

Also, the oil mess down the front of the block was probably also due in part to that split CCV hose to the left of the vacuum pump. (But you probably already knew that.)

apexit4 · 11-02-2018, 06:45 AM

My vacuum pump started leaking after I bought the car. I decided to replace the entire pump as preventative maintenance just in case though (I found a new OEM pump on eBay for around $200).

Getting the pump out while the engine is assembled isnt hard though. Id suggest replacing the rubber o-ring first and seeing if it keeps leaking. If it does, then its a simple matter of just replacing the pump with a new one.

10-31-2018, 01:12 PM	#1
command_liner Private 20 Rep 88 Posts Drives: 2009 335d Join Date: Feb 2015 Location: United States iTrader: (0) Garage List 2018 Chevy Cruze Di ... [0.00] 2016 Chevy Cruze [0.00] 2018 Kubota Closed ... [0.00] 2002 Saturn LW200 [0.00] 2002 Saturn LW200 [0.00] 1978 MotoGuzzi Lema ... [0.00] 1970 BMW R75/5 [0.00] 1990 Suzuki VX800 [0.00] 1999 KTM LC4 [0.00] 1993 Saturn SL2 [0.00] 1978 Yanmar 186D [0.00] 1988 Honda HawkGT [0.00] 1970 Chrysler Newport [0.00] 2000 Honda Recon [0.00] 2000 Honda Recon [0.00] 1964 Chevy Chevelle ... [0.00] 2004.5 Chevy Silverado [0.00] 2009 335D [0.00]	Oil leak at vacuum pump A search of the forum did not lead to a direct answer, so here goes. The car is majorly apart for turbos, EGR, DPF, SCR, CAT, intercooler, exhaust, etc. With everything out of the way I see there is a non-trivial oil leak at the vacuum pump. The pump casing is crusted over with oil, and there is oil leaking down the front of the motor. Is this a known issue? Is the fix as simple as replacing the main o-ring for that application? My big turbo has a lot of oil in it from bad bearings (major screeching noise on boost) which is probably due to plugged DPF (as shown on the dash). Is the vacuum pump just leaking oil as a result of that general failure, or does it fail on its own? Thanks for any thoughts. Photo here: https://www.flickr.com/photos/comman...7702238699375/ Last edited by command_liner; 10-31-2018 at 01:51 PM.. Reason: New photo
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10-31-2018, 03:50 PM	#2
PerfectAce Second Lieutenant 107 Rep 202 Posts Drives: 2011 335d Sport Join Date: Jun 2017 Location: Austin, Texas iTrader: (0)	This thread might provide some insight: https://www.e90post.com/forums/showt...php?p=20806171 Also, the oil mess down the front of the block was probably also due in part to that split CCV hose to the left of the vacuum pump. (But you probably already knew that.)
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11-02-2018, 06:45 AM	#3
apexit4 Major 1231 Rep 1,101 Posts Drives: 335D M-Sport, X5D Join Date: Apr 2018 Location: Maryland iTrader: (0)	My vacuum pump started leaking after I bought the car. I decided to replace the entire pump as preventative maintenance just in case though (I found a new OEM pump on eBay for around $200). Getting the pump out while the engine is assembled isnt hard though. Id suggest replacing the rubber o-ring first and seeing if it keeps leaking. If it does, then its a simple matter of just replacing the pump with a new one.
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