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Mystery spring in my m20 block...

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In the process of replacing my sump gasket I noticed part of this long thin spring poking out of the back of the crank (see green circle). I gave it a gentle pull, as you do, and it came out.

WTF is it?

Car is a 325i touring automatic, with a SA m20b25 motor.

Thanks..

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It goes around the front / rear crank seal (it's apart of it) whichever end that was. If you pulled that out you should replace the seal..

Edited by e30ftw

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Aha, that makes sense. Good thing I have a new rear main seal here ready to go :D

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