thanks Mowerfreak

Thought so, as well, maybe there has been some wear on the washer and/or housing lip over time.

Attached 2 more close-ups for further comment


Attachments
Oil Seal Guard Washer_ PICT0646w.jpg (81.78 KB, 136 downloads)
Oil Seal Guard Washer_ PICT0647w.jpg (77.27 KB, 138 downloads)