Yamaha 115-225 HP Outboards Service Manual, Page 188Get this manual
Ii[ I-POWER TRIM AND TILT UNIT
9) Install the tilt-cylinder
Bushing Tilt-cylinder
10) Fit new a-ring and the back-up ring to the free-piston, and install it into the tilt-cylinder
Free-piston O-ring
Back-up ring 11) Fit new a-ring and the back-up ring to the tilt-piston, and install the piston in the tiltcylinderFill the cylinder with hydraulic fluid, and using the special service tool, tighten the end-screw to the specified torque, Endscrew: 80 Nm (8.0 m.kg, 58 ft.lb)