1986+ Mercury 6/8/9.9/10/15HP 2-stroke Factory Service Manual, Page 175Get this manual
POWERHEAD
7Uneven Wear: Uneven wear could be caused by bent connecting rod
aUneven wear between arrows 8If necessary, clean connecting rod bearing surfaces as follows aBe sure that etched marks on connecting rod (crankshaft end) are perfectly aligned with etched marks on connecting rod capTighten connecting rod cap attaching screws securely
CAUTION
Crocus cloth MUST BE USED to clean bearing surface at CRANKSHAFT END OF CONNECTING ROD320 grit Carborundum cloth MUST BE USED to clean bearing surface at PISTON PIN END OF CONNECTING RODbClean crankshaft end of connecting rod by using CROCUS CLOTH placed in slotted 9.5 mm (38 in diameter shaft as shownSecure shaft in drill pressOperate press at high speed while keeping connecting rod at 90 angle to slotted shaftIMPORTANT: Clean connecting rod just enough to clean up bearing surfaceDO NOT continue to clean after marks are removed from bearing surface320 Carborundum Cloth Crocus Cloth To Drill Motor