1997+ Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-826148R2, Page 185Get this manual
Piston and Connecting Rod Disassembly 1R emove piston ringsAlways install new piston rings
CAUTION
Safety glasses should be worn when removing or installing lock rings3R emove piston pin lock rings using awlAlways install new lock rings
52680Piston Ring xpander (PN 91-24697) 52679
2Scribe cylinder number (1 or 2) on inside of ach piston and rod assembly as they are removed to insure re assembly of correct piston to same connecting rod