| The Z is like a bad girlfriend -- so much drama but you can't let her go. So now I'm nervous. As part of the clutch job I did last summer I replaced the rear main seal but after driving 150 miles I noticed it did not completely stop the oil leak through the bell housing (although it slowed it down a lot). Now I've removed the real oil seal retainer to replace that gasket and noticed there are two grooves in the crankshaft! 
The grooves separate the orange engine oil colored part from the silver. I imagine these grooves mate up with the oil seal lip and dust seal lip below. Is that correct, or have I found a much bigger problem? If I am correct it seems critical to install the rear main seal fully to match up to these grooves. 
If I'm right and you could post a picture of the grooves in the crankshaft from your last build I'd much appreciate the piece of mind. Thanks.
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Please post Pictures of rear main seal groove in Crankshaft - 
