1986+ Mercury 6/8/9.9/10/15HP 2-stroke Factory Service Manual, Page 187Get this manual
POWERHEAD
IMPORTANT: When replacing roller bearing halves, replace both halves together10Apply 2-4-C with Teflon to center main bearing surface of crankshaft and install center main roller bearing halves
2-4-C with Teflon
aBearing halves 11Model 10 and 1995 and newer Model 9.9: Position center main bearing race halves (retaining ring groove toward flywheel end of crankshaft) around center main roller bearingMake sure fracture lines of race halves are correctly mated12Secure center main bearing race halves together with retaining ringVerify retaining ring bridges both fracture lines of bearing race