Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-42794--1, Page 277Get this manual
2Install O-rings on cylinder and secure manifold
assembly to cylinder using screwsTorque screws to 100 lbin (11 Nm)
4Install check valve components and O-rings to manifoldSecure oil pump to manifold using boltTorque bolt to 90 lb in (9.9 Nm)
a-rings il Pump Screw Spring Check Ball