1985 Mercury Outboard V-300 V-3.4L Shop Service Manual, Page 240Get this manual
INSTALLING ENGINE on BOAT TRANSOM IMPORTANT: Before drilling any mounting holes, carefully read the transom he ight Intormatlon In Figure 4There Is 0," (19mm) difference between engine mounting hole locations(Figure 3)
ILocate veni cal centerline of boat tran som, as shown in
Fi gurean mark centerli ne (with pe nci l) on tra nsom
NOTE: DimensionsA""8and "C""0" are Equal LengfhIICenter 01 Transom
Figure 1Locating Center of Boat Transom
2Re move engine mount ing te mplate fro nd of th ese inst ruc tio ns3Drill upper engi ne moun ting holes, as follo ws:Use utboardransom Drill Fi xtu re" (91 .98234Al)
o secure (tape) te mplat to out ide of transomAl ign ver tical centerli ne of te mpla te with ce nte of transom and to of tran som line template with top of (real) boat tra nsom, not himmed
a4" 4-1 2" Long Mounting Bolt (2 Req'd)6" or 6-112" Long Mounting Bolt (2 Req'd)Flat WashersLocknuts (4- Eng ine Transom Brackets (alter Drill ing Bottom Mo unting Holes, Position to Recomme nded Engine Mounting Height)