Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 356Get this manual
MANUAL TILT ASSIST
Valve Block Disassembly
1Remove check retainer plug and components
2Remove hydraulic oil transfer valve plugs and components3Remove surge valve assembly
Transler Valve Plug Assembly (2)Check Retainer Plug or Screw Assembly Spool SpringO-ringVelocity Valve