2001 Mercury Mariner 50-60HP Factory Service Manual, Page 60Get this manual
OUTBOARD MOTOR INSTALLATION
Installing Outboard Thumb Screw Models
WARNING
Outboard must be fastened to boat transom one of two ways: 1permanently fastened to transom with thumb screws, and mounting bolts (provided), or 2secured to the transom using the optional outboard mounting kit (shown below)Should the outboard strike an underwater object or be steered into sharp turn, failure to fasten outboard correctly to the boat transom with mounting bolts or optional mounting kit could result in outboard ejecting suddenly off boat transom causing serious injury, death, boat damage, or loss of outboardIMPORTANT: Optional outboard mounting kits shown, must be used if outboard will not be permanently fastened to the transom with mounting bolts