1985 OMC 65, 100 and 155 HP Models Commercial Service Manual, PN 507450-D, Page 260Get this manual
Removal of Exhaust Housing and Adaptor 100 and 155 Models
If equipped with power trim and tilt, refer to Section 10 for removal instructions1Remove the powerhead as described in Section 42Remove the gearcase as described in Section 6
100 manual tilt models have tilt assist shock absorber which exerts considerable upward pressureRemoving the exhaust housing while in the down position could allow sudden release of parts which could cause serious injuryPlace motor in tilt position to relieve pressure3155 ModelsRemove six screws holding frame and seal assembly to lower engine coverRemove two lower engine cover rear rubber mount screws and nuts, retaining lower engine cover to exhaust housing adaptorRemove lower engine cover assembly 100 ModelsRemove two lower engine cover rear rubber mount screwsretaining lower engine cover to exhaust housing adaptorLift and turn lower engine cover assembly to free cover from adaptor