1985 Mercury Outboard V-300 V-3.4L Shop Service Manual, Page 242Get this manual
8Appl marine scaler 10 shanks of mo um ing boll (nol Ihreads) nd secure engine 10 Iranso wilh boll s, nat washers an locknut s, as shown in Fi gure 3He sure that installation is wa tertight ACAUTION
Silicone Sealer Is NOT suitable for underwater useUse good grade of marine sea ler, that Is suitable for underwater use (to make watertight installation)on shanks of engine mounting bolts,