Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 339Get this manual
MANUAL TILT ASSI ST
Slow Tilt Down Under High Thrust
To tilt the engine down under high thrust conditions [where the propeller thrust forces the shock rod down, creating higher pressure below the memory piston (mH, the camshaft lever (1) is rotated slightly downwardThe internal shaft connected to the lever will open the down circuit slow transfer valve (i) allowing oil under pressure into the cavity around the shaftThe higher oil pressure will open the up circuit fast transfer valve (j) allowing oil from the bottom of the cylinder to flow above the shock piston (n) while lowering the engineAdditional oil will flow into the accumulator (c) as the internal pressure forces the accumulator check valve (e) to open Oil flowing into the accumulator moves the accumulator piston (d) and compresses the gas