Mercury Mariner Service Manual 6, 8, 9.9 210CC Sailpower, Page 83Get this manual
IMPORTANT: When replacing roller bearing halves, replace both halves together11 .Apply Needle Bearing Assembly Lubricant to center main bearing surface of crankshaft and install center main roller bearing halves (a) 3Install one half of center main bearing sleeve (a) into cylinder block
4Check each piston ring for spring tension thru transfer and exhaust ports by pressing with screwdriverIf no spring tension exists (ring fails to return to position), it is likely that the piston ring was broken during assembly [replace broken piston ring(s))Use caution not to burr piston rings while inspecting