Mercury - Quicksilver 8M0204670 Bearing Carrier Seal Quicksilver Marine Components Stainless Steel 8M0204670. Overview. When you're out on the water, you don't think much about the small parts buried deep inside the gearcase - until one of them fails. A good bearing carrier seal is one of those unsung heroes that keeps your engine running smooth and your mind at ease. The Quicksilver Bearing Carrier Seal, part number 8M0204670, is built for boaters who'd rather spend their day chasing open water