1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 330Get this manual
3Remove four screws securing reservoir to manifold Manifold Removal
1Remove screws and manifold from cylinder
aScrews (4)
51193 51007Trim CylinderManifoldScrew (2)
4Remove reservoir from manifold5Remove drive shaft from oil pump
2Remove check valve components from manifold
IMPORTANT: Sleeve (d) is chamfered on I.Don end opposite drilled cross holeInstall spool (e) (with O-ring installed) from chamfered end of sleeve to avoid possibility of damaging O-ring on spool