Leaks from upper oil pan gasket?

[bmwpower603]

Just did full timing, check valves, valley pan, oil pan, front main..

Do I need to take front clip off to find out for sure?

This is where I think leak is...





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[bmwpower603]

Could it be old oil? From up top? Oil hasn't gone down...

[2004B6S4]

FYI the lower circle is where the upper oil pan meets the block. The block itself is made of 2 pieces joined together, and the upper circle in your pic is where the 2 halves of the block meet. I was looking into this recently because I also suspected a possible leak coming from that seal. If you wanted to remove and reseal the upper oil pan you would have to pull the engine back out and remove the timing covers, at least that's what the ELSA manual says. I don't believe it has a procedure for resealing the two halves of the block together. Personally I decided to cross my fingers and leave it alone. I think I was mistaken anyways about that suspected leak, because it didn't show up again after my 2nd and more thorough job of cleaning up that area (I have yet to refill the oil and run the engine, so still not certain)

[2004B6S4]

looking at your first photo, you can see there's still a little gunk trapped in the crevices that didn't get completely cleaned off -


What likely happened is that this gunk had soaked up some oil and/or whatever liquid cleaner you were using, and you got the surrounding area thoroughly clean but this gunk was still soaking wet with oil/cleaner, so afterwards the liquid slowly seeped out of the gunk and spread around the surrounding area. (that's what I'm hoping happened in my case, because I thought I cleaned up the whole area really well, then I saw some fresh oil appear after that and suspected a leak, but there was still a little gunk I had left behind in a small crevice so hopefully that's all it was)

[bmwpower603]

There is a lot of places it could be gunked up. And definitely still is. Especially after the mess of oil in the valley pan after replacing the oil check valves, and oil jet.

Id like to take the front clip off. And clean the engine !!! But connecting the coolant hose back to the bottom of the front clip is bitch. Worst part IMO.

[bmwpower603]

looking at your first photo, you can see there's still a little gunk trapped in the crevices that didn't get completely cleaned off -


What likely happened is that this gunk had soaked up some oil and/or whatever liquid cleaner you were using, and you got the surrounding area thoroughly clean but this gunk was still soaking wet with oil/cleaner, so afterwards the liquid slowly seeped out of the gunk and spread around the surrounding area. (that's what I'm hoping happened in my case, because I thought I cleaned up the whole area really well, then I saw some fresh oil appear after that and suspected a leak, but there was still a little gunk I had left behind in a small crevice so hopefully that's all it was)

Took front clip off. . To find. . Nothing. .
Cleaned it a little bit.




Going to buy dye tomorrow. So I can pin point this leak.





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[MDH2Os]

What did you end up finding out on this leak? I have a leak coming from the same location and was also told it was the upper oil pan gasket.