I've been chasing an oil leak on a BMW M3 for about a year now. Pictures are worth a whole lot more than words, so here are some photos of the symptom:
Oil pooling inside the transmission bell housing:
Thought it was coming from the rear main seal, so replaced that first:
During this job, I noticed that the leak looked like it originated higher up, from somewhere behind the cylinder head:
So, I decided to swap out one of the camshaft position sensors thinking the o-ring around it might have been the source:
Finally had it traced down to screw in the back of the cylinder head.
Here's the BMW diagram of the the part itself (Part #14 in the diagram below)
I'll do a full write-up once the repair is concluded.
Monday, November 21, 2011
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