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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Sun, Apr-22-2018, 03:01:03 AM   #21
e46Dan
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Default Re: The strangest oil leak

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Originally Posted by PITT M3 RR View Post
Ok bmw calls for sealant there. That’s the first thing I would do and you can also inspect the VC for cracks. That’s something cheap and easy to cross off before going further.
Good point, it's pretty easy to pull the valve cover gasket off and add some simple insurance. I put a small bead of rtv around the surface of the head and the valve cover. I've got my fingers crossed. The gasket did get slightly bent in shipping back on the corner near the half moons.

....and still leaking. I guess the transmission is going to come off again so I can get to the back of the head.

Last edited by e46Dan; Sun, Apr-22-2018 at 03:08:49 AM.
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Old Sun, Apr-22-2018, 03:40:10 PM   #22
e46Dan
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Default Re: The strangest oil leak

At this point I think it was the intake cam sensor. I replaced the o-ring and took it for a drive. There was just a smidge of oil this time and I believe it was old oil that worked its way down when it got hot.

Last edited by e46Dan; Sun, Apr-22-2018 at 03:47:09 PM.
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Old Sun, Apr-22-2018, 03:51:05 PM   #23
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Default Re: The strangest oil leak

That makes sense. Especially w the angle of the motor. Clean it all up real good and test again. Nice find.
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Old Sun, Apr-22-2018, 05:51:36 PM   #24
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Default Re: The strangest oil leak

When I was chasing this crap, carb cleaner and paper towels were my friend. I went through several cans of carb cleaner at once to really clean everything up and figure out where it was coming from.

Good progress.

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'85 528e 164k miles (sold)
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All DIY: 330 ZHP steering rack, diffsonline 4.1 diff with rem polish, E60 short shifter lever, AKG black diff bushings/subframe bushings, Rogue rtab, WPC rod bearings, Beyer driveshaft, full SS (SS stepped V1, catted S1, resonated S2, SS sport), Sachs clutch/flywheel, rear main, VANOS bullet proofing with anti-rattle, valve adjustment, cooling refresh, Ohlins R&T/Swift 448f 672r/GC street tops and camber plates, AFD E85 Proflex kit.

Happy to help with VANOS or any other DIY job around NorCal
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Old Sun, Apr-22-2018, 07:08:06 PM   #25
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Default Re: The strangest oil leak

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Originally Posted by e46Dan View Post
At this point I think it was the intake cam sensor. I replaced the o-ring and took it for a drive. There was just a smidge of oil this time and I believe it was old oil that worked its way down when it got hot.


To reach that sensor u have to remove the cabine filter and all parts that included?? I know that place in the back of the engine is a pain in the but to reach...


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Old Sun, Apr-22-2018, 07:14:52 PM   #26
e46Dan
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Default Re: The strangest oil leak

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To reach that sensor u have to remove the cabine filter and all parts that included?? I know that place in the back of the engine is a pain in the but to reach...


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I removed the cabin filter and my intake manifold. Then I removed the vacuum rail next to the injectors and the plastic triangular piece that sits at the end of the rail in front of the sensor. Thankfully I don't usually have the cabin filter in and my intake manifold is super easy to remove.
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Old Sun, Apr-22-2018, 07:18:44 PM   #27
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Default Re: The strangest oil leak

Couple of diys with pics. Intake side is a bit of a pain.

http://www.e46fanatics.com/forum/sho.../topics/862891


https://www.pelicanparts.com/techart...eplacement.htm
Quote:
Originally Posted by Filipebmwm3 View Post
To reach that sensor u have to remove the cabine filter and all parts that included?? I know that place in the back of the engine is a pain in the but to reach...


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Quote:
Originally Posted by e46Dan View Post
I removed the cabin filter and my intake manifold. Then I removed the vacuum rail next to the injectors and the plastic triangular piece that sits at the end of the rail in front of the sensor. Thankfully I don't usually have the cabin filter in and my intake manifold is super easy to remove.
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'85 528e 164k miles (sold)
'05 M3 6MT coupe

All DIY: 330 ZHP steering rack, diffsonline 4.1 diff with rem polish, E60 short shifter lever, AKG black diff bushings/subframe bushings, Rogue rtab, WPC rod bearings, Beyer driveshaft, full SS (SS stepped V1, catted S1, resonated S2, SS sport), Sachs clutch/flywheel, rear main, VANOS bullet proofing with anti-rattle, valve adjustment, cooling refresh, Ohlins R&T/Swift 448f 672r/GC street tops and camber plates, AFD E85 Proflex kit.

Happy to help with VANOS or any other DIY job around NorCal
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Old Mon, Apr-23-2018, 02:21:59 PM   #28
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Default Re: The strangest oil leak

I was able to pull my hand back there and it was dry except for where the bolt holds it to the block. You might try that before you take it all apart. I've put about 20 miles on the car now and no more leaks.
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Old Tue, Apr-24-2018, 04:43:07 AM   #29
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Default Re: The strangest oil leak

Did you check the cpv? I had a similar leak and when put on a lift, the shop determined leak was from the cpv


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Old Tue, Apr-24-2018, 04:45:58 AM   #30
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Default Re: The strangest oil leak

Post 3 from OP rules it out...
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Originally Posted by cloudm3 View Post
Did you check the cpv? I had a similar leak and when put on a lift, the shop determined leak was from the cpv


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'85 528e 164k miles (sold)
'05 M3 6MT coupe

All DIY: 330 ZHP steering rack, diffsonline 4.1 diff with rem polish, E60 short shifter lever, AKG black diff bushings/subframe bushings, Rogue rtab, WPC rod bearings, Beyer driveshaft, full SS (SS stepped V1, catted S1, resonated S2, SS sport), Sachs clutch/flywheel, rear main, VANOS bullet proofing with anti-rattle, valve adjustment, cooling refresh, Ohlins R&T/Swift 448f 672r/GC street tops and camber plates, AFD E85 Proflex kit.

Happy to help with VANOS or any other DIY job around NorCal
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Discussing The strangest oil leak in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)