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6 Series
The BMW 6 Series builds on BMW's sporty heritage with aggressive lines and an incredible motor to back the design up. Available in coupe and convertible trims with a standard 4.8 liter engine producing 360 horsepower and 360 lb-ft of torque, the 6-series is a popular choice that exceeds expectations.

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  #1  
Old 07-12-2011, 03:31 PM
dawg1 dawg1 is offline
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645ci Oil Leak help - have pic

Just started seeing a few drops of oil on garage floor. I looked at engine and if standing at the front looking down at engine, it appears to be coming from the front of the motor towards the left. I found a couple of wires that looked coated with oil. Can someone tell me if there is a common leaking component in this area? Also fair price to fix if anyone has an idea (?). Thanks.




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  #2  
Old 07-12-2011, 05:21 PM
HerbP HerbP is offline
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Either your valve cover gasket, or timing cover gaskets are starting to leak! I would go ahead & change both of them, to be on the safe side!
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  #3  
Old 07-12-2011, 08:11 PM
the6dude the6dude is offline
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In addition...

Looks like that may be right under your vacuum pump which is prone to leaking. Also your oil pressure switch is located in that area as well. Pretty much right under the vacuum pump on the block. I had both of these leaks. If you unplug the cable to the oil pressure switch you'll be able to tell if its leaking because oil will seep out of the plastic loom covering the wires. Hope this helps.
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  #4  
Old 07-12-2011, 08:22 PM
the6dude the6dude is offline
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The vacuum pump will cost you about $450 and the oil pressure switch about $6, parts only at autohausaz.com or bavauto.com. You can do both of these yourself pretty easily. Expect to pay at least $1000 and $400 at the stealership. I haven't replaced the valve cover gasket but from what I understand they are time consuming but doable. HerbP can give you more details on that, I think he's replaced just about every gasket on the 6er
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  #5  
Old 07-14-2011, 10:08 PM
the6dude the6dude is offline
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Any update?
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  #6  
Old 07-14-2011, 10:55 PM
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It looks like the vacuum pump

Here it is for $375

http://www.autopartsway.com/PartList...pagenum1/tabS/
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  #7  
Old 07-15-2011, 06:45 AM
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Only $344 on partsgeek.com

http://www.partsgeek.com/catalog/200...cuum_pump.html
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  #8  
Old 07-15-2011, 08:28 AM
HerbP HerbP is offline
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If the vacuum is working fine, do not change it. There is a o-ring on it, that can be replaced a lot cheaper. I say if you change the valve cover gaskets, change the timing cover gaskets while you are that far. You will have to remove the vacuum pump, to get to the passenger side timing cover off. The valve cover gaskets are a PITA, but doable. OEM valve cover gasket's are 80.00 each, aftermarket can be found for 40.00 each. Timing cover gaskets are 13.00 each. Dealer will charge from 800 to 1200 labor for valve cover gaskets. Timing cover gasket labor while changing valve cover gasket, around an additional 500.00.

I can not stand oil leaks, so I did all of mine. I don't really want to pay the dealer 1800.00, for work that I can do!

Hope this might help!
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  #9  
Old 07-17-2011, 02:02 PM
dawg1 dawg1 is offline
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thanks for the comments. I rubbed my hand underneath that pump (around those wires) and saw fresh oil so it must be coming from that (?). Is the oil sending unit under that too? I don't want to change all those other gaskets unless absolutely necessary - car has 38k miles. Where's the oring that leaks? Is that pump easy to remove? What should I try first?
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  #10  
Old 07-17-2011, 02:09 PM
HerbP HerbP is offline
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If the wire loom for the oil sensor is leaking, change that 1st. Around 12.00 to 15.00 at your local BMW dealer. The vacuum pump is around 20 to 60 minutes to remove, based on your skill level. You will need female torx sockets to remove the bolts. l will post a link for the removal. Get some engine cleaner & remove all oil possible, to make sure you can watch the oil leak.

Good Luck!

http://tis.spaghetticoder.org/s/view.pl?1/07/45/33
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  #11  
Old 07-17-2011, 02:43 PM
dawg1 dawg1 is offline
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Thanks for the link. Just to clarify, I do have to remove that vacuum pump to get to the oil switch right?
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  #12  
Old 07-17-2011, 06:02 PM
dawg1 dawg1 is offline
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another thing to mention maybe is that in between the few drops of oil and the large puddle, I did have an oil change -- wonder if that puddle was from a spill of oil or something along those lines (?). Just drove car for a bit and don't see any puddle or drips that would resemble such a puddle
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  #13  
Old 07-17-2011, 06:45 PM
the6dude the6dude is offline
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First check the oil pressure switch. It is located under the vacuum pump on the block. You DO NOT have to remove the vacuum pump to get to it. I used a larger deep socket that fit right over the switch once the connector was unpluged. It came right out. You will know if its the cause of your leak because as soon as you unplug the connector more oil will leak out and the wire loom will be full of oil. This is the cheaper repair and should take less than a hour. I took me about that long start to finsh and cleaning all the oil off the engine and belts. I can maybe take pictures tomorrow if you need them. Here is the TIS for the oil pressure switch. http://tis.spaghetticoder.org/s/view.pl?1/07/45/86



Once the oil pressure switch is replaced and if that doesnt fix your problem move on to the vacuum pump. Like HerbP said the seal is what normally goes bad but I just replaced the entire unit. That should also take less than a hour. Good luck!
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  #14  
Old 07-17-2011, 06:49 PM
dawg1 dawg1 is offline
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6dude, are you thinking I may have 2 leaks -- second being from the oil switch? What about that oil in the last pic on top of the vac pump?
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  #15  
Old 07-17-2011, 07:00 PM
the6dude the6dude is offline
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I just took a few pics I'll post shortly. I don't think you pump is leaking from the top. It typically leaks from the rubber o ring seal.
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  #16  
Old 07-17-2011, 07:13 PM
dawg1 dawg1 is offline
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ok, thanks for any pics. i don't understand about the oil on top of that pump though. i cleaned that pump, drove the car around and then could see the new oil there. did you see the top of vac pic a couple of posts up?
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  #17  
Old 07-17-2011, 07:26 PM
the6dude the6dude is offline
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OK, take a look at the first pic (696) it shows the wiring loom below the vacuum pump that connects to the oil pressure switch. Oil will seep out of this from the oil pressure switch when it goes bad. It makes it very difficult to determine exactly where the leak is coming from. The other two pictures will give you a pretty good idea where the oil pressure switch is located. It's right under the vacuum pump. Like I said earlier I would replace this switch first then the vacuum pump.

As for your pic...I think if you just had an oil change that may just be oil that spilled from the oil change. The leaks I had where from the vacuum pump seal and the oil pressure switch.

Hope this helps!
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  #18  
Old 07-29-2011, 03:59 PM
the6dude the6dude is offline
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Any update Dawg1???????????
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  #19  
Old 08-20-2011, 12:19 AM
brown370 brown370 is offline
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It is hard to tell where your leak is until you clean up the oil. Take a can of brake cleaner spray and spray it on the engine to clean up all the oil. Brake cleaner works wonders and will clean your engine without leaving any residue. Then crank the car, let it run, and check for leaks. After I did this I found it was my valve covers leaking.
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  #20  
Old 11-05-2011, 05:26 PM
bigtyme562 bigtyme562 is offline
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I might have the same issue. I had an oil change done and a few days later I noticed the leaking. it looks like it could be the oil pressure switch. Can the oil pressure switch be changed without removing the vacuum pump? Any DIY links would be great as I might need to change both.
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  #21  
Old 11-05-2011, 05:51 PM
the6dude the6dude is offline
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Yep! The oil pressure switch can be changed without removing the vacuum pump. I replaced mine in about 30 minutes.
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  #22  
Old 11-05-2011, 07:41 PM
bigtyme562 bigtyme562 is offline
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thanks "the6dude"
if you dont mind could you go over the steps. I looked over the TIS link you provided and it helps but its not clear to me.
Would I need to release the sliver connector then pull off with my hand, then use a wrench that will fit and remove the oil pressure switch. Once removed replace with new one and tighten. lastly connect the plug and reconnect the silver connector?
Over all can this be done without removing any items surrounding and basically use hand to squeeze in?
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  #23  
Old 11-12-2012, 01:30 AM
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I had an exact same leak in the position as in your top picture of the pipe. This pipe was replaced in the recall. I initially thought that it was coming from below the pipe join as when I moved the pipe it seemed that it was loose below it !
What I did was remove the holding clip and replace it with jubilee screw clip and tighten, this corrected to leak completely. I believe that many of those crimp clips used on holding pipes do not hold as well and much prefer what we call jubilee clips as in the old days!!!

I am referring to Dawg1's pictures of the vacuum pump, oops !!
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Last edited by 645/333; 11-12-2012 at 01:36 AM.
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  #24  
Old 11-05-2011, 07:44 PM
bigtyme562 bigtyme562 is offline
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whats size socket did you use?
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  #25  
Old 11-05-2011, 09:06 PM
the6dude the6dude is offline
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You should be able to get to it without moving or removing anything. I was able to unplug the connector from under the car. It can be done from up top but I wasn't sure how the connector was unlatched. Once I got the connector off I used a deep socket and a ratchet with an extention to remove the switch. I did not remove anything to get to it. It is a tight fit but doable. See the pics above. I can take more if needed.
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