2001 Mercury Mariner 50-60HP Factory Service Manual, Page 309Get this manual
CLAMPSWIVEL BRACKETSDRIVE SHAFT HOUSING
Driveshaft Housing Reassembly
1Replace driveshaft housing assembly to transom bracketTwo people may be required for this, one to hold the driveshaft housing, the other to install the upper and lower bolts2Tighten lower bolts to specified torqueMake sure washers are in the correct position3Tighten ground strap bolt