1985 OMC 65, 100 and 155 HP Models Commercial Service Manual, PN 507450-D, Page 210Get this manual
C082391
Replacement of Upper Main Bearing Seal100
The presence of oil under the flywheel indicates leaking upper main bearing sealTo replace the seal, the bearing must be removed from the crankshaftFollow the portions of the powerhead removal, disassembly, reassembly and installation necessary to replace the upper main bearing seal
Removal of Powerhead100
prevent electrical sparks, disconnect the battery cables at the batteryAvoid accidental starting of the engineDisconnect the two wire connectors between the stator and the powerpack2Remove the two front rubber mount screws starboard)3Remove the shift rod connector screw 1'To
(port and
(two port
4Remove the four exhaust housing cover screws and two starboard)
5Remove the two lower engine cover to rear exhaust housing cover screws and remove the rear exhaust housing cover6Disconnect the thermostat hoses