1985 OMC 65, 100 and 155 HP Models Commercial Service Manual, PN 507450-D, Page 232Get this manual
2Lift crankshaft and crankshaft heads from cylinder block and place on bench for disassemblyReinstall connecting rod caps on rods and remove the connecting rods and pistons from the cylinders3Remove the upper crankcase head from the crankshaft and discard -rings To remove seal, insert punch through bottom of bearing to engage seal lip and drive seal out with malletDO NOT reuse sealIf bearing is damaged, crankcase head and bearing assembly must be replaced4 Remove four screws (lower crankshaft head to lower bearing retainer plate) and remove lower crankcase head from crankshaftRemove seal by driving out with punch and malletRemove and discard the a-rings Discard the four lower crankshaft head screwsAlways use new screws when installing the crankshaft head to bearing retainer plate5I nspect ball bearing at lower end of crankshaft and remove if damagedUse OMC Special Tool PIN 307429 (Truarc Pliers) to remove retaining ring under bearingUse OMC Special Tool PIN 378103 (Universal Puller) provided with four screws PIN 316296 14-28 3" long, threaded into the tapped holes in the bearing retainer plate to remove bearing