Mercury Mariner V-250 V-275 Outboard Service Shop Manual 1990, Page 169Get this manual
7Apply Loctite Grade "A" on threads of upper mount bracket retaining boltsSecure upper mount bracketTorque bolts to 20 lb ft (27.1 Nm) 8Install upper mount bolts, spacers and bumper9Install drive shaft housing onto swivel bracket
aBumperBoltsUpper MountsSpacers
10Apply Loetite Grade "A" on threads of upper mount nutsInstall nylon washersmetal washers and upper mount nuts Torque nut to 50 lbft (67 .7 Nm)Upper MountBracketUpper MountsBoltsBracket Retaining