Common front oil leak locations? - BMW M5 Forum and M6 Forums
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post #1 of 7 Old 28th April 2019, 06:58 PM Thread Starter
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Common front oil leak locations?

Seem to have a moderate oil leak that just started; car was really dry up until a few days ago. I just replaced the timing chain tensioner, but looking at it with a mirror, it sure looks squeaky clean all around, so I'm worried it's just a coincidence. Oil is dripping off all of the front oil pan bolts as well as the passenger side control arm. Poking around under the car it might be coming from the front main oil seal, but are those very prone to just fail like that? Also seems *more* on the PS than DS. Anything else in the lower, front, PS area that I need to try to get a good look at to check? Thanks for any tips!
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post #2 of 7 Old 28th April 2019, 08:12 PM
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Front main seals leak, but the PS lines weep also. Although I would place money on the PS lines it would not be much, because the main seal is common too.
Get a can of brake cleaner or other spray, clean and rinse, then go for a short drive. Inspect and look for the starting place of the leak. Looking at a mess that has been there for a bit will just confuse you.

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post #3 of 7 Old 29th April 2019, 02:20 PM Thread Starter
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Well, cleaned it up as best I could this morning and will check it this afternoon after a few short errands to see if I can make any more progress on pinpointing the issue. Also, apologies for not being clear with abbreviations; I meant passenger side, not power steering. I'm quite sure this is not power steering fluid I'm dealing with. Will try to double check vanos and tensioner before I start it today, but so far I don't think either of those is the likely source.
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post #4 of 7 Old 29th April 2019, 03:22 PM Thread Starter
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Well, might have some ideas now. There are two tubes that go into the top of the oil pan; one is the dipstick and I'm not sure what the other is. I also can't quite tell which one is the dipstick tube either. Anyone know what the 'other' tube is, which one is which, and how they both seal? Thanks!
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post #5 of 7 Old 29th April 2019, 03:24 PM Thread Starter
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Ahh, ok I think the dipstick goes down on the side and the one on the front right next to the crank pulley is the drain for the oil separators, is that right? How difficult is it to get those out to replace the orings?
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post #6 of 7 Old 30th April 2019, 12:29 AM Thread Starter
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Well, seems like it's either the separator return pipe or the main seal. Things seam most 'wet' on the topside of the lower oil pan in the vicinity of the crank pulley, but I just can't figure out which is more likely. Can't see behind the pulley very well, but I *think* it's pretty dry further up, so I'm kinda leaning toward the return pipe, but I think either is a pretty big job to be able to access If I do start taking off all the coolant stuff to get to the oil separator parts, how hard is it to get the crank pulley off and put in a new main seal?
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post #7 of 7 Old 7th May 2019, 02:21 PM
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Quote:
Originally Posted by austrianvespaguy View Post
how hard is it to get the crank pulley off and put in a new main seal?
Not hard, pretty straightforward. Pulley is six small bolts. Damper behind that is 4 stretch bolts that must be replaced, front seal is 5 seconds with a hook puller to pull it out.

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