I cleaned up the front cover on the 1650 in preperation of replacing the front oil seal. I didn't pay much attention to the inside face of the cover when I pulled it off. Now that I'm prepping to go back together I noticed that there are &quot;grooves&quot; cut on the inside face of the cover where the cork faced seal will ride against. There is nothing &quot;sharp&quot; on the old spring loaded oil seal that I can see that would have cut into the cover making two &quot;ridged&quot; circles or grooved rings. 

I would think that the inside face of the front cover where the oil seal will contact would be flat and not grooved, unless the ridges or grooves are there to help control oil leakage past the seal. I don't recall what the 1800 looked like when I did it or if I even noticed.

Anyone set me straight? I can post up a picture if needed.

Thanks.