1984-1986 Mercury Force 9.9 and 15HP Outboards Service Manual, Page 55Get this manual
CAUTION Install piston rings with bevel on inner edge facing up toward top of pistonFigure 29
TOP OF PISTON
Figure 29lnst.lllng Piston Ri ng OTighten ring compressor until piston and ring can enter cylinder borePush piston into bore with thumb pressur e
2Install ing piston in cyl inder bor e:
Coat pistons, piston ringsand cylinder bore with SAE #3Ooil
CAUTION
Insufficient ring compression can damage to piston InsetFigure 31 L.OOSE COMPRESSOR RING COMTESSOR
8e ure to nstall piston to cyli nder bore it was removed from BInstall piston in ring compressor (Special Tool NoT2997)
CAUTION