1997+ Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-826148R2, Page 239Get this manual
SHOCK FUNCTION RETURN After the engine clears the under water object, the weight of the engine will increase the oil pressure between the memory piston (e) and shock piston (d) to the level required to open the shock return valve (v), inside the shock piston, allowing the oil to bleed back through the shock piston into the down cavityIf required, additional oil will enter the down cavity through the suction valve (g)This will return the engine back against the memory piston (e) in to the original running position