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What is this plug from?

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Old 12-17-2018, 07:13 PM
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Default What is this plug from?
Tonight I took off the lower aluminum reinforcement plate under the front subframe for the first time and found this plug sitting on it. Anyone know where it goes? Looks like a plug for a drain hole or something. Also found a clip for the air filter box but that one was easy to take care of.

2009 535xi 6mt wagon.

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Old 12-17-2018, 07:28 PM
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Which aluminum plate? The stiffener plate under the subframe?
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Old 12-17-2018, 07:29 PM
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Yes. A previous owner would have dropped it and it fell on the aluminum plate under the engine. Took it off to change front differential fluid.
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Old 12-21-2018, 02:07 PM
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Bump. I guess no one has seen one of these before? I’ll try on an E90 forum in case it’s a part that’s N54 specific.
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Old 12-21-2018, 03:32 PM
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It is on my automatic tranny by the flywheel. It allows access to the bolts that hold the torque converter to the flywheel. On a MT car I haven't seen this cover before, but it may be for the N54's MT.
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Old 12-21-2018, 04:37 PM
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Oh right, most cars have a plug on top of the flywheel to check if it is at TDC. I’ll look to see if that’s the case.
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Old 12-22-2018, 01:33 AM
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No, not on top. Next to the oil pan, I think on the passenger side.
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Old 12-22-2018, 06:14 AM
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Oh, okay. I noticed an opening at the bottom of the bell housing where I could see the flywheel so that must be for TDC monitoring, but it was a square hole. I didn't look on the sides but next time it's up on ramps I'll check. Thank you.
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Old 12-24-2018, 05:34 AM
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The c shaped deflector on the plug is oriented towards the ground when you reinstall.
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Old 12-26-2018, 05:45 PM
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Originally Posted by Sirius815
No, not on top. Next to the oil pan, I think on the passenger side.
I looked up the par number and according to this diagram (part 9) it looks like you certainly are correct as it shows it next to the oil pan. Thanks.
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