Mercury Optimax Models 135, 150, Direct Fuel Injection., Page 302Get this manual
CLAMPSWIVEL BRACKETSDRIVE SHAFT HOUSING
3Push exhaust tube boots onto tabs on each side of exhaust tube4Position exhaust tube in drive shaft housing and push down on tube until boots rest in grooves on inside of housing5Position driveshaft housing to plate gasket on top of housing6Install an exhaust diffuser gasket and exhaust diffuser onto plate, then secure both to plate with boltsClean bolts with Loctite 7649 Primer and then apply Loctite 271 to bolt threadsTorque bolts to 60 Ibin(7.0 Nm)