Mercury Mariner V-250 V-275 Outboard Service Shop Manual 1990, Page 174Get this manual
Trim CylinderRemoval and Installation REMOVAL
5Place la rge drip pan under trim cylinder and disconnect hydrau lic hosesUse caution when rem oving hoses as there may be considerable fluid pressure
6Rem ove cover plate from each side of engine clamp
bracket
jl.WARNING
When working around an outboard, follow these 3
1Disconnect battery leads from battery2Be sure that remote control wiring harness Is connected to engine wiring harness(Engine can be started with or without remote control wiring harness connected to engine wiring harness, but engine cannot be shut off unless harnesses are connected together 3Turn ignition key toOFF" position and remove key from switch
jl.WARNING